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Chickadees use memory ‘bar codes’ to find their hidden food stashes

Unique subsets of neurons in a chickadee’s memory center light up for each distinct cache, hinting at how episodic memories are encoded in the brain.

Here’s how magnetic fields shape desert ants’ brains

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Articles on New research

Displaying 1 - 20 of 361 articles.

Competitive workplaces don’t work for gender equality

Amalia Rebecca Miller , University of Virginia and Carmit Segal , University of Zurich

Many travel nurses opt for temporary assignments because of the autonomy and opportunities − not just the big boost in pay

Ivan Gan , University of Houston-Downtown

Tweaking US trade policy could hold the key to reducing migration from Central America

Raymond Robertson , Texas A&M University and Kaleb Girma Abreha , Texas A&M University

69% of US Muslims always give to charities during Ramadan, fulfilling a religious obligation

Shariq Siddiqui , Indiana University

Trump-era tax cuts contributed to a decline in higher ed giving, with fewer Americans donating to colleges and universities

Jin Lee , University of Louisiana at Lafayette

Helping children eat healthier foods may begin with getting parents to do the same, research suggests

Kelley Gullo Wight , Indiana University and Peggy Liu , University of Pittsburgh

New studies suggest millions with mild cognitive impairment go undiagnosed, often until it’s too late

Soeren Mattke , University of Southern California and Ying Liu , USC Dornsife College of Letters, Arts and Sciences

AI can help predict whether a patient will respond to specific tuberculosis treatments, paving way for personalized care

Sriram Chandrasekaran , University of Michigan

Pacemaker powered by light eliminates need for batteries and allows the heart to function more naturally − new research

Pengju Li , University of Chicago Pritzker School of Molecular Engineering

The hostility Black women face in higher education carries dire consequences

Ebony Aya , Macalester College

How ‘hometown associations’ help immigrants support their communities in the US and back in their homelands

Susan Appe , University at Albany, State University of New York

Teenagers often know when their parents are having money problems − and that knowledge is linked to mental health challenges, new research finds

Jamie Hanson , University of Pittsburgh

Immune cells can adapt to invading pathogens, deciding whether to fight now or prepare for the next battle

Kathleen Abadie , University of Washington ; Elisa Clark , University of Washington , and Hao Yuan Kueh , University of Washington

Rare access to hammerhead shark embryos reveals secrets of its unique head development

Gareth J. Fraser , University of Florida

Dreading footy season? You’re not alone – 20% of Australians are self-described sport haters

Hunter Fujak , Deakin University and Heath McDonald , RMIT University

Are our fears of saying ‘no’ overblown?

Julian Givi , West Virginia University and Colleen P. Kirk , New York Institute of Technology

Making it personal: Considering an issue’s relevance to your own life could help reduce political polarization

Rebecca Dyer , Hamilton College and Keelah Williams , Hamilton College

Bacteria in your gut can improve your mood − new research in mice tries to zero in on the crucial strains

Andrea Merchak , University of Florida

AI can help − and hurt − student creativity

Sabrina Habib , University of South Carolina

Telehealth makes timely abortions possible for many, research shows

Leah Koenig , University of California, San Francisco and Ushma Upadhyay , University of California, San Francisco

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Pregnancy Increases Biological Age, but Giving Birth Changes it Back

Carrying a baby creates some of the same epigenetic patterns on DNA seen in older people

Saima Sidik, Nature magazine

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How the Supreme Court’s Mifepristone Ruling Could Affect Abortion Access and Future Drug Approvals

The Supreme Court’s mifepristone decision could make abortions harder to access and challenge the FDA’s authority to regulate all drugs and devices

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A state court ruling that embryos from in vitro fertilization are unborn children harms access to care for fertility patients, as well as medical innovations

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Use of Abortion Pills Has Risen Significantly Post Roe, Research Shows

By Pam Belluck

Pam Belluck has been reporting about reproductive health for over a decade.

• Share full article

On the eve of oral arguments in a Supreme Court case that could affect future access to abortion pills, new research shows the fast-growing use of medication abortion nationally and the many ways women have obtained access to the method since Roe v. Wade was overturned in June 2022.

The Details

A study, published on Monday in the medical journal JAMA , found that the number of abortions using pills obtained outside the formal health system soared in the six months after the national right to abortion was overturned. Another report, published last week by the Guttmacher Institute , a research organization that supports abortion rights, found that medication abortions now account for nearly two-thirds of all abortions provided by the country’s formal health system, which includes clinics and telemedicine abortion services.

The JAMA study evaluated data from overseas telemedicine organizations, online vendors and networks of community volunteers that generally obtain pills from outside the United States. Before Roe was overturned, these avenues provided abortion pills to about 1,400 women per month, but in the six months afterward, the average jumped to 5,900 per month, the study reported.

Overall, the study found that while abortions in the formal health care system declined by about 32,000 from July through December 2022, much of that decline was offset by about 26,000 medication abortions from pills provided by sources outside the formal health system.

“We see what we see elsewhere in the world in the U.S. — that when anti-abortion laws go into effect, oftentimes outside of the formal health care setting is where people look, and the locus of care gets shifted,” said Dr. Abigail Aiken, who is an associate professor at the University of Texas at Austin and the lead author of the JAMA study.

The co-authors were a statistics professor at the university; the founder of Aid Access, a Europe-based organization that helped pioneer telemedicine abortion in the United States; and a leader of Plan C, an organization that provides consumers with information about medication abortion. Before publication, the study went through the rigorous peer review process required by a major medical journal.

The telemedicine organizations in the study evaluated prospective patients using written medical questionnaires, issued prescriptions from doctors who were typically in Europe and had pills shipped from pharmacies in India, generally charging about $100. Community networks typically asked for some information about the pregnancy and either delivered or mailed pills with detailed instructions, often for free.

Online vendors, which supplied a small percentage of the pills in the study and charged between $39 and $470, generally did not ask for women’s medical history and shipped the pills with the least detailed instructions. Vendors in the study were vetted by Plan C and found to be providing genuine abortion pills, Dr. Aiken said.

The Guttmacher report, focusing on the formal health care system, included data from clinics and telemedicine abortion services within the United States that provided abortion to patients who lived in or traveled to states with legal abortion between January and December 2023.

It found that pills accounted for 63 percent of those abortions, up from 53 percent in 2020. The total number of abortions in the report was over a million for the first time in more than a decade.

Why This Matters

Overall, the new reports suggest how rapidly the provision of abortion has adjusted amid post-Roe abortion bans in 14 states and tight restrictions in others.

The numbers may be an undercount and do not reflect the most recent shift: shield laws in six states allowing abortion providers to prescribe and mail pills to tens of thousands of women in states with bans without requiring them to travel. Since last summer, for example, Aid Access has stopped shipping medication from overseas and operating outside the formal health system; it is instead mailing pills to states with bans from within the United States with the protection of shield laws.

What’s Next

In the case that will be argued before the Supreme Court on Tuesday, the plaintiffs, who oppose abortion, are suing the Food and Drug Administration, seeking to block or drastically limit the availability of mifepristone, the first pill in the two-drug medication abortion regimen.

The JAMA study suggests that such a ruling could prompt more women to use avenues outside the formal American health care system, such as pills from other countries.

“There’s so many unknowns about what will happen with the decision,” Dr. Aiken said.

She added: “It’s possible that a decision by the Supreme Court in favor of the plaintiffs could have a knock-on effect where more people are looking to access outside the formal health care setting, either because they’re worried that access is going away or they’re having more trouble accessing the medications.”

Pam Belluck is a health and science reporter, covering a range of subjects, including reproductive health, long Covid, brain science, neurological disorders, mental health and genetics. More about Pam Belluck

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1 in 10 Asian Americans live in poverty. Their experiences vary widely, research says

Juliana Kim

People walk through a busy street in Chinatown in New York City. About 11% of Chinese Americans live in poverty, according to a new analysis by the Pew Research Center. Spencer Platt/Getty Images hide caption

People walk through a busy street in Chinatown in New York City. About 11% of Chinese Americans live in poverty, according to a new analysis by the Pew Research Center.

A Nepalese immigrant in his early 40s described the stress and uncertainty he felt during college about how to afford rent, food and tuition despite having a scholarship.

A man of Hmong origin in his mid-30s said he struggled with the decision to either attend college or go straight into the workforce to provide for his family.

And a woman of Pakistani descent in her early 30s said she didn't see her father often while growing up because he worked constantly to support their family and other relatives in Pakistan.

These were some of the responses in a new report from the Pew Research Center about the wide variety of experiences among Asian Americans living in poverty, based on 18 focus groups in 12 languages with 144 participants.

The report was part of a set of research published Wednesday to capture Asian Americans in economic hardship on a quantitative and qualitative scale. The project drew from focus groups, as well as census and survey data.

Most Asian Americans say they face discrimination and are often treated as foreigners

Nationally, 1 in 10 people of Asian descent live at or below the poverty line. But the rate was vastly different depending on country of origin, researchers found . For instance, about 6% of Indian Americans live in poverty while the rate is 19% for Burmese Americans.

Through focus groups, researchers also found that the challenges and opinions around poverty for Asian Americans differed based on age and whether they were born in or immigrated to the U.S.

"There are also shared experiences among Asian Americans living in poverty such as day-to-day financial difficulties, assumptions by others that they do not need help because they are Asian, and the importance of financial security in achieving their American dream," said Neil G. Ruiz, who co-authored the set of Pew reports.

Burmese, Hmong and Mongolian Americans experience some of the highest poverty rates

About 17% of Hmong Americans and 16% of Mongolian Americans live at or below the poverty line, according to a Pew analysis of the 2022 American Community Survey.

The rate of poverty was between 10% and 13% across Korean, Malaysian, Laotian, Chinese, Vietnamese, Thai, Indonesian, Bangladeshi, Pakistani and Cambodian groups. The poverty rate for Nepalese, Japanese, Sri Lankan and Filipino American groups was between 6% and 9%.

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The analysis also found that 26% of all Asians living below the poverty line are located in just three major cities: New York City, Los Angeles and San Francisco. High rates of poverty among Asian Americans also exist in Fresno, Calif.; Buffalo, N.Y.; and Pittsburgh, Penn., according to the analysis.

Within major cities, the rate of poverty among Asian groups can vary even further. For example, according to a 2021 report from the New York mayor's office, about 32% of Bangladeshi immigrants and 29% of Pakistani immigrants in the city experienced poverty.

About a fifth of survey respondents said they have never asked for help from family, friends or the government

When it came to finding help with bills, housing, food or jobs, Pew researchers found that 61% of Asian adults living in poverty turned to family or friends.

Nearly half of respondents said they also sought government assistance on a local, state or federal level. Meanwhile, 19% of respondents said they have never asked or received support from the government, nor from religious institutions or community organizations.

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Some participants in Pew's focus groups shared that government programs were difficult to access, because they were not proficient in English and the programs were not translated in their native language, according to Ruiz.

He also found that Asian immigrants who were refugees or asylum seekers were more familiar with government assistance than Asians who moved to the U.S. for other reasons, such as educational opportunities.

Asian Americans spoke about not knowing how to save or invest

Fifty-seven percent of Asian adults living in poverty said they were unable to save for emergencies this past year, according to the Pew survey.

In focus groups from this past year, participants shared that part of the issue was simply not having enough money to set aside, according to Ruiz. Another factor was a lack of financial literacy.

"When they are able to save, we heard people just don't know how," he said.

Ruiz added that not knowing how to save or invest was an especially common frustration among focus groups participants who were born in the U.S.

A 2023 survey by JPMorgan Chase found that confidence in reaching retirement goals varied across cultures. While 68% of Indian participants and 59% of Vietnamese respondents said they were confident in saving for retirement, only 35% of Korean participants felt the same.

U.S.-born Asian Americans expressed skepticism that education guarantees success

The role and significance of education was a common theme in focus groups.

While many foreign-born Asian participants believed that education was a key to getting out of poverty, U.S.-born Asians respondents tended to believe that their future depended on the type of education they received, he said.

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"Some people were not necessarily saying a bachelor's degree is the best thing," he added. "But then you did hear about financial education and learning how to invest."

In the focus groups, U.S.-born Asians who could speak English discussed the feeling that education was not enough to succeed, adding that networking and financial literacy played a role, according to Ruiz.

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How hispanic americans get their news, u.s.-born latinos overwhelmingly prefer to get their news in english; about half of immigrant latinos prefer it in spanish.

Pew Research Center conducted this study to understand Hispanic Americans’ habits around news and information, including the languages in which they consume news and their engagement with Hispanic media outlets.

Most of the questions in this report are from Pew Research Center’s 2023 National Survey of Latinos, a survey of 5,078 U.S. Hispanic adults conducted Nov. 6-19, 2023. This includes 1,524 Hispanic adults on the Center’s  American Trends Panel  (ATP) and 3,554 Hispanic adults on Ipsos’ KnowledgePanel . Respondents on both panels are recruited through national, random sampling of residential addresses. Recruiting panelists by phone or mail ensures that nearly all U.S. adults have a chance of selection. This gives us confidence that any sample can represent the whole population, or in this case the whole U.S. Hispanic population. (For more information, watch our  Methods 101 explainer  on random sampling.)

To further ensure the survey reflects a balanced cross-section of the nation’s Hispanic adults, the data is weighted to match the U.S. Hispanic adult population by age, gender, education, nativity, Hispanic origin group and other categories. Read more about the  ATP’s methodology . Refer to the topline for the questions used for our National Survey of Latinos , along with responses, and to methodology for more details.

The questions about how often people get news from various platforms, which platforms they prefer for getting news, and which social media sites people get news from are from an ATP survey of 8,842 U.S. adults, including 1,193 Hispanic adults, conducted Sept. 25-Oct. 1, 2023. Refer to the topline for t he questions used for this survey , along with responses, and to the methodology for more details.

Pew Research Center is a subsidiary of The Pew Charitable Trusts, its primary funder. This is the latest report in Pew Research Center’s ongoing investigation of the state of news, information and journalism in the digital age, a research program funded by The Pew Charitable Trusts, with generous support from the John S. and James L. Knight Foundation.

The terms  Hispanic  and  Latino  are used interchangeably in this report.

Hispanic/Latino Americans, Hispanic/Latino adults , and Hispanics/Latinos are used interchangeably in this report to refer to survey respondents who self-identify as Hispanic or Latino in the United States. They include those who say their race is White, Black, Asian or some other race and those who identify as multiracial. Hispanic/Latino Americans live in the U.S. but are not necessarily U.S. citizens.

U.S. born  refers to people born in the 50 states or the District of Columbia.

Immigrant  refers to people born outside the 50 states or D.C. For the purposes of this report, immigrants include those born in Puerto Rico or another U.S. territory. Although individuals born in Puerto Rico are U.S. citizens by birth, they are grouped with immigrant respondents because they were born into a Spanish-dominant culture and because on many points their attitudes, views and beliefs more closely resemble those of Hispanics born outside the U.S. than Hispanics born in the 50 states or D.C., and even U.S.-born Hispanics who identify as being of Puerto Rican origin.

Second generation  refers to people born in the 50 states or D.C. who have at least one parent born in a different country, Puerto Rico or another U.S. territory.

Third generation   or higher refers to people born in the 50 states or D.C. who have two parents born in the 50 states or D.C.

Language dominance  is a composite measure based on self-described assessments of speaking and reading abilities.  Spanish-dominant  people are more proficient in Spanish than in English (i.e., they speak and read Spanish “very well” or “pretty well” but rate their English ability lower).  Bilingual  refers to people who are proficient in both English and Spanish.  English-dominant  people are more proficient in English than in Spanish.

“Middle income” is defined here as two-thirds to double the median annual family income for panelists on the American Trends Panel. “Lower income” falls below that range; “upper income” falls above it. Refer to the methodology for more details.

Hispanic news outlets are those outlets that focus on providing news and information specifically to Hispanic audiences. These can include newspapers, radio or TV stations, podcasts, or social media accounts created for and by Hispanic people. Their content could be in Spanish, English, both languages or another language.

Country of origin refers to the country that survey respondents, their parents or their Hispanic ancestors came from.

Just over half of U.S. Hispanic adults (54%) get their news mostly in English – far higher than the share who get their news mostly in Spanish (21%). About a quarter of Hispanic Americans (23%) say they consume news in both languages about equally.

There is an almost identical pattern on the question of preferred language for news: 51% prefer to get their news in English, 24% prefer Spanish and 23% say they do not have a preference.

But a new Pew Research Center survey of adults who identify as Hispanic or Latino finds major differences in news consumption habits between U.S.-born Hispanics and those who immigrated from other countries .

While U.S.-born Latinos overwhelmingly get their news in English, and prefer it in English, those born outside the United States have much more varied habits: 41% get their news mostly in Spanish, 26% get it primarily in English and 31% do both about equally. Similarly, 47% of Latino immigrants prefer to get their news in Spanish, while 22% prefer English and 31% do not express a preference.

Among Latino immigrants, those who have spent more years in the U.S. are less inclined than more recent arrivals to get news in Spanish, and more inclined to get it in English. There is little difference in the shares who get news in both languages about equally.

Jump to more information on the languages in which U.S. Latinos consume news.

We asked these questions to better understand how a group that makes up nearly one-in-five Americans stays informed, especially as its demographics and use of Spanish continue to change. Immigrants are declining as a share of all U.S. Hispanics , and the share of Hispanics who speak Spanish at home has also dropped – even though the number of Hispanics who speak Spanish at home has increased due to overall growth in the Hispanic population.

Other key findings about Hispanics’ news consumption include:

Most Latino adults prefer digital devices for news

Latinos get their news from a variety of sources, but most say they prefer to use digital devices over other platforms. Nearly nine-in-ten (87%) say they get news from digital devices at least sometimes, and 65% say they prefer this form of news over TV, radio or print. Digital devices have become an increasingly common source for news among Latinos – and among Americans overall – in recent decades, a shift driven by the rise of the internet .

Latinos are more likely than White Americans (55%) and Black Americans (50%) to prefer getting news from digital devices. Latinos also are more likely than White and Black adults to get news from social media, at least in part because Latino adults tend to be younger than other groups, and young adults are more inclined to use social media for news.

Nearly three-quarters of Latino adults under 50 (73%) prefer to get their news on digital devices, including 27% who prefer social media specifically.

Jump to more information on the platforms where U.S. Latinos get news.

Attention to news is declining among U.S. Latinos

About one-in-five Latino adults (22%) say they follow the news all or most of the time, while an additional 36% follow the news some of the time. The share of Latinos who follow the news all or most of the time has fluctuated in recent years but has dropped by 9 percentage points between 2020 (31%) and 2023 (22%), similar to a pattern seen across the general U.S. public .

In recent years, Hispanic Americans have followed the news less closely than Black and White Americans. Again, the high share of young adults within the Hispanic population plays a role, because young people are less likely to follow the news closely. Among Hispanic adults ages 18 to 29, just 10% say they follow the news all or most of the time – far below the share of Hispanics ages 65 and older who do so (44%).

Jump to more information on U.S. Hispanics’ news consumption habits.

Half of Hispanic adults get news from Hispanic news outlets

Half of U.S. Hispanic adults say they at least sometimes get news from Hispanic news outlets – those that specifically cater to Hispanic audiences. This includes 21% who say they do this extremely or very often. Just over half of Hispanics (54%) get news about their or their family’s country of origin at least sometimes, including 24% who do this often. 

Hispanic immigrants are much more likely than U.S.-born Hispanics to get news from Hispanic outlets and about their origin country. In both cases, about seven-in-ten immigrants say they at least sometimes get these types of news: 69% get news from Hispanic outlets and 72% get news about their country of origin. Among Hispanic adults who were born in the U.S., 33% at least sometimes get news from Hispanic outlets, and 38% get news about their family’s country of origin.

There are further differences among U.S.-born Hispanics: Those whose parents were also born in the U.S. are even less likely than those with one or more immigrant parent to get these types of news.

Jump to more information on Hispanic news outlets and news about Hispanic Americans’ origin countries.

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About Pew Research Center Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research. Pew Research Center does not take policy positions. It is a subsidiary of The Pew Charitable Trusts .

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AAP News Research Updates

The following are AAP Research articles published in AAP News in the last 5 years:

Survey highlights pediatricians’ international backgrounds March 2024

AAP grants provide research opportunities for residents February 2024

Racial, ethnic disparities remain among U.S. children living in poverty December 2023

Hispanic children twice as likely to be uninsured as children of other races/ethnicities November 2023

AAP study: Most early career pediatricians own home despite high educational debt September 2023

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Pediatricians report 18.5% of patient families have limited proficiency with English July 2023

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Annual survey shows most pediatric residents land job they want May 2023

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Grants aim to kick-start pediatric residents' research careers January 2023

COVID-19 hospital admissions rising among children, especially those under 5 December 2022

AAP membership doubles since 1987; women make up majority December 2022

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AAP studies examine prevalence of burnout, strategies to reduce occurrence October 2022

Survey shows most pediatricians find work rewarding but some are frustrated September 2022

AAP Surveys Show 14% of Pediatricians, 69% of Residents Treated Firearm Injuries August 2022

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Hispanic, Black youths represent disproportionate percent of COVID hospitalizations May 2022

AAP study: Pediatricians satisfied with career despite pandemic challenges April 2022

Residency graduates surveyed on pandemic’s effect on training, job search March 2022

Deadline to apply for Resident Research Grants is Feb. 28 January 2022 AAP study: Most early career pediatricians would choose same subspecialty December 2021

US child population decreasing, becoming more diverse November 2021

Survey: Pediatricians anticipate COVID-19 vaccine hesitancy among parents October 2021

Just over half of US children insured by public programs September 2021

Communication training linked to higher HPV vaccination rates August 2021

US births continue declining, a trend that started in 2008 July 2021

1 year of data shows how pediatric COVID-19 cases ebbed and flowed June 2021

Analyses of pediatric COVID-19 cases in 2 states highlight disparities May 2021

Early career pediatricians satisfied with work despite challenges April 2021

Annual survey shows graduating residents have high debt load, high career satisfaction March 2021

High rates of teen vaping reported in early 2020 February 2021

Survey: Pediatricians reeling from pandemic's sustained impact January 2021

AAP grants provide research opportunities for residents January 2021

Percent of children without health insurance rising; Hispanics fare worst December 2020

Study looks at persistence of pediatric hypertension during childhood November 2020

Intervention reduces unnecessary outpatient antibiotic prescribing for children October 2020

56% of pediatricians say they can complete recommended screenings September 2020

Who are America's children? AAP analyzes federal data August 2020

Survey: Pandemic disrupting practices, finances of early, midcareer pediatricians June 2020

Graduating pediatric residents report factors influencing subspecialty choice May 2020

Percent of pediatricians facing malpractice claims drops March 2020

Have passport, will travel: Global health piques more pediatricians' interest March 2020

Deadline to apply for Resident Research Grant is Feb. 28 January 2019

Majority of early and midcareer pediatricians bring work home December 2019

Survey: Suicide, suicidal ideation encountered often in pediatric practice November 2019 Studies find gender disparities in pediatrician pay, household duties October 2019 Minority of pediatricians routinely screen for social needs September 2019

100th Periodic Survey compares pediatricians' concerns in 1987 with 2018 August 2019

Nearly 70% of pediatric residents report caring for children with gun injuries July 2019

Residents satisfied with training but may struggle with work-life balance May 2019

Study compared experiences of U.S., international medical school graduates April 2019

Survey: EHRs a mainstay of practice, but pediatric functionality lacking March 2019

Grant aims to kick-start pediatric residents' research careers January 2019

Study: Young Pediatricians satisfied with careers December 2018

Child poverty rates improve but disparities persist November 2018

Study: pediatricians surveyed on acute care provided outside medical home September 2018

Study examines factors associated with resident choice to enter hospitalist workforce July 2018 ​ Nearly all pediatric residents find job after graduation May 2018

What do early career pediatricians find stressful?​ April 2018​

​Survey: Graduating residents' debt levels off, salaries rise modestly​ March 2018 ​ More pediatricians counseling on sun safety​​; few discuss indoor tanning​​ February 2018​

Deadline to apply for Resident Research Grants is Feb. 28th January 2018

Study looks at trends in breastfeeding attitudes, counseling practices​ November 2017

Survey: Most pediatricians take family history, fewer order genetic tests October 2017

Percent of AAP members who are women increases from 28%-63% over 30 years September 2017

​Survey: Many pediatricians don't follow lipid recommendations August 2017

Study: Primary care pediatricians working fewer hours July 2017

Study analyzes ADHD diagnosis, stimulant use after guideline released June 2017

Nearly all residents satisfied with t​​raining; few satisfied with time devoted to practice management​ May 2017​

Study: Most young pediatricians own home despite high debt April 2017

Most pediatricians advise families to quit smoking, but few assist with cessation March 2017

Study: Only 23% of youths with hypertension receive diagnosis February 2017 AAP grants provide research opportunities for residents January 2017

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March 27, 2024

Purdue researchers create biocompatible nanoparticles to enhance systemic delivery of cancer immunotherapy

Purdue University researchers are developing and validating patent-pending nanoparticles (left) to enhance immunotherapy effects against tumors. The nanoparticles are modified with adenosine triphosphate, or ATP, to recruit dendritic cells (right), which are immune cells that recognize tumor antigens and bring specialized immune cells to fight off tumors. (Images provided by Yoon Yeo)

PLGA nanoparticles modified with ATP slowly release anti-cancer drugs and recruit immune cells to fight tumors

WEST LAFAYETTE, Ind. — Purdue University researchers are developing and validating patent-pending poly (lactic-co-glycolic acid), or PLGA, nanoparticles modified with adenosine triphosphate, or ATP, to enhance immunotherapy effects against malignant tumors.

The nanoparticles slowly release drugs that induce immunogenic cell death, or ICD, in tumors. ICD generates tumor antigens and other molecules to bring immune cells to a tumor’s microenvironment. The researchers have attached ATP to the nanoparticles, which also recruits immune cells to the tumor to initiate anti-tumor immune responses. 

Yoon Yeo leads a team of researchers from the College of Pharmacy , the Metabolite Profiling Facility in the Bindley Bioscience Center , and the Purdue Institute for Cancer Research to develop the nanoparticles. Yeo is the associate department head and Lillian Barboul Thomas Professor of Industrial and Molecular Pharmaceutics and Biomedical Engineering; she is also a member of the Purdue Institute for Drug Discovery and the Purdue Institute for Cancer Research.

The researchers validated their work using paclitaxel, a chemotherapy drug used to treat several types of cancers. They found that tumors grew slower in mice treated with paclitaxel enclosed within ATP-modified nanoparticles than in mice treated with paclitaxel in non-modified nanoparticles.

“When combined with an existing immunotherapy drug, the ATP-modified, paclitaxel-loaded nanoparticles eliminated tumors in mice and protected them from rechallenge with tumor cells,” Yeo said.

The research has been published in the peer-reviewed journal ACS Nano .

Challenges to systemic immunotherapy delivery

Immunotherapy is a promising approach to fighting cancer, but Yeo said it does not benefit a large population of patients because they do not have the powerful immune cells needed to combat tumors. 

“Pharmacological agents to activate immune cells can directly be given to tumors,” Yeo said. “Then the immune system can fight not only the treated tumors but also nontreated tumors in distant locations as the activated immune cells circulate in the bloodstream.”

However, Yeo said most tumors with poor prognoses are not always locatable or accessible. Therefore, they may not be effectively treated by local therapy. She and her team envisioned systemic delivery of immunotherapy, but there are challenges.

“For successful systemic administration, active ingredients that stimulate anti-tumor immune responses need to be simultaneously present in tumors to exert concerted effects on the target,” Yeo said. “The ingredients also must maintain their activity until they reach tumors, but not cause toxic off-target effects. Moreover, the carriers traditionally used in local drug delivery offer limited utility in systemic application because they may not be compatible with blood components.” 

Yeo and her colleagues used biocompatible polymeric nanoparticles to deliver immunotherapy compounds and modified them to safely activate the immune system. 

“We employed poly (lactic-co-glycolic acid), or PLGA, nanoparticles based on the strong track record of the polymer in FDA-approved products and its routine use in the systemic delivery of poorly water-soluble drugs,” Yeo said.

Tests verified the ATP-modified PLGA nanoparticles were well tolerated in mice upon multiple systemic injections. They were able to recruit dendritic cells, the immune cells that recognize tumor antigens and bring specialized immune cells to fight off tumors. 

“Moreover, the nanoparticles were shown to control the release of paclitaxel to minimize its systemic toxicity,” Yeo said.

The next development steps

Yeo and her colleagues will continue their work on the ATP-modified nanoparticles.

“We are currently working on improving the delivery of the nanoparticles to tumors and combining them with other treatments that will circumvent the resistance to the nanoparticle-delivered immunotherapy,” Yeo said. “To finance these efforts, we will apply for continued support from the National Institutes of Health. We are also open to industry partnerships to take this technology to the clinic.”

Yeo disclosed the nanoparticles innovation to the Purdue Innovates Office of Technology Commercialization , which has applied for a patent from the U.S. Patent and Trademark Office to protect the intellectual property. Industry partners interested in developing the compound or commercializing it for the marketplace should contact Joe Kasper, assistant director of business development and licensing — life sciences, at [email protected] , about track code 69546 .

Yeo and the research team received funding from the National Institutes of Health, the National Center for Advancing Translational Sciences, the Indiana Clinical and Translational Sciences Institute, and the Purdue Institute for Cancer Research.

About Purdue University

Purdue University is a public research institution demonstrating excellence at scale. Ranked among top 10 public universities and with two colleges in the top four in the United States, Purdue discovers and disseminates knowledge with a quality and at a scale second to none. More than 105,000 students study at Purdue across modalities and locations, including nearly 50,000 in person on the West Lafayette campus. Committed to affordability and accessibility, Purdue’s main campus has frozen tuition 13 years in a row. See how Purdue never stops in the persistent pursuit of the next giant leap — including its first comprehensive urban campus in Indianapolis, the new Mitchell E. Daniels, Jr. School of Business, and Purdue Computes — at https://www.purdue.edu/president/strategic-initiatives .

About Purdue Innovates Office of Technology Commercialization

The Purdue Innovates Office of Technology Commercialization operates one of the most comprehensive technology transfer programs among leading research universities in the U.S. Services provided by this office support the economic development initiatives of Purdue University and benefit the university’s academic activities through commercializing, licensing and protecting Purdue intellectual property. In fiscal year 2023, the office reported 150 deals finalized with 203 technologies signed, 400 disclosures received and 218 issued U.S. patents. The office is managed by the Purdue Research Foundation, which received the 2019 Innovation & Economic Prosperity Universities Award for Place from the Association of Public and Land-grant Universities. In 2020, IPWatchdog Institute ranked Purdue third nationally in startup creation and in the top 20 for patents. The Purdue Research Foundation is a private, nonprofit foundation created to advance the mission of Purdue University. Contact [email protected] for more information.

Writer/Media contact: Steve Martin, [email protected]

Source: Yoon Yeo, [email protected]

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