Extracellular RNA Biogenesis, Biodistribution, Uptake, and Effector Function (U19) | Apply Online

Opportunity Summary:

This NIH funding opportunity, titled "Extracellular RNA Biogenesis, Biodistribution, Uptake, and Effector Function (U19)," supports large, team-based research programs aimed at understanding how regulatory RNA molecules move between cells and what they do once they arrive. The central focus is extracellular RNAs (exRNAs), meaning RNA species that are packaged and transported outside of their originating cells (for example, within extracellular vesicles or other carrier complexes) and then delivered to recipient cells. The NIH is looking for projects that can uncover the governing principles behind which RNAs are selected for export, how those RNAs travel through the body, how they enter target cells, and how they ultimately influence biology in health and disease.

Scientifically, the announcement highlights four tightly connected areas that applicants are expected to address in an integrated way. First is exRNA biogenesis, which includes the cellular pathways that generate and sort RNAs into extracellular carriers, the molecular machinery that decides what gets exported versus retained, and the conditions that change export behavior (such as stress, inflammation, infection, or transformation). Second is biodistribution, meaning where exRNAs go after release, how long they persist, what tissues they accumulate in, and what physical or biological barriers shape their movement through blood, lymph, and other compartments. Third is uptake by target cells, which includes receptor-mediated interactions, endocytosis or fusion mechanisms, cell-type specificity, and the factors that determine whether delivered RNAs escape into the cytoplasm or are degraded. Fourth is effector function, which is the downstream physiological impact of delivered exRNAs in recipient cells and tissues, such as changes in gene expression, immune signaling, tissue remodeling, or disease progression. The overarching theme is intercellular communication: exRNAs are treated not just as biomarkers but as functional messengers capable of altering recipient biology.

Because these questions require sophisticated capabilities, the NIH makes clear that enabling tools and technologies will likely be necessary to meet the goals. That can include new analytical methods to profile and quantify exRNAs, improved isolation and characterization approaches for extracellular carriers, validated bioreagents and standards, imaging or tracking methods to follow exRNA movement in vivo, and computational or statistical frameworks to interpret complex datasets. The emphasis on tools is not separate from biology; it is framed as essential for moving the field from descriptive observations toward causal, mechanistic insight. As a result, the NIH anticipates that successful projects will be run by multidisciplinary teams bringing together expertise from fields such as RNA biology, extracellular vesicle biology, molecular and cellular biology, immunology, physiology, engineering, imaging, bioinformatics, and clinical or translational research.

From an administrative standpoint, this is a discretionary NIH opportunity using a Cooperative Agreement mechanism (U19). That structure typically indicates substantial NIH involvement and coordination, and it also signals that the project is expected to be a multi-component, collaborative program rather than a single-investigator effort. The activity category is health, and it falls under the NIH trans-institute research support CFDA listing 93.310. The program was posted on Aug 3, 2012, with an original and current closing date of Nov 13, 2012, and an archive date of Dec 14, 2012. The estimated total funding listed is $7,200,000, which reinforces that the NIH intended this to support sizeable, coordinated research efforts.

Eligibility is broad and includes many types of organizations that can assemble the required team science approach. Eligible applicants include public and private institutions of higher education, nonprofits (including 501(c)(3) and other nonprofit structures), for-profit organizations (other than small businesses), small businesses, and multiple levels of government entities (city/township, county, state, special district, and independent school districts), as well as public housing authorities and tribal governments and organizations. The eligibility section also explicitly includes a range of mission-based and capacity-building institution types such as Historically Black Colleges and Universities (HBCUs), Hispanic-serving institutions, Alaska Native and Native Hawaiian-serving institutions, and tribally controlled colleges and universities (TCCUs). Importantly, foreign participation is allowed: non-U.S. entities may apply, non-U.S. components of U.S. organizations are eligible, and foreign components as defined by NIH policy are permitted. There is no cost-sharing or matching requirement stated for this opportunity.

In practical terms, the opportunity is designed for applicants who can propose a cohesive program that connects mechanism to function: how specific RNAs are selected for export, how they are packaged and stabilized, how they travel and reach particular tissues, how recipient cells internalize them, and how those delivered RNAs produce measurable biological effects. The NIH is signaling that progress in this space requires both biological discovery and the development of robust, shareable methods and reagents, with the ultimate goal of clarifying how exRNA-mediated communication contributes to normal physiology and to disease processes.

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Next opportunity: Clinical Utility of Extracellular RNA for Therapy Development (UH2/UH3)

Previous opportunity: Clinical Studies of Safety and Effectiveness of Orphan Products Research Project Grant (R01)

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