Lymphatics in Health and Disease in the Digestive, Cardiovascular and Pulmonary Systems (R21) | Apply Online

Opportunity Summary:

The NIH funding opportunity PAR-12-260, titled "Lymphatics in Health and Disease in the Digestive, Cardiovascular and Pulmonary Systems (R21)," is an exploratory/developmental grant program designed to spark early-stage, high-impact research on how lymphatic vessels function in normal physiology and how they contribute to disease processes in major organ systems. The central aim is to encourage innovative projects that clarify what lymphatic vessels do in the digestive, cardiovascular, and pulmonary systems, how their structure and function are regulated locally within specific tissues, and how lymphatic dysfunction can alter organ performance, worsen disease, or influence recovery. The announcement also highlights interest in lymphatics as they relate to resolution of thromboembolic events, as well as inflammation and immune responses in these disease contexts, while making an important boundary clear: applications that primarily focus on immune mechanisms as the main scientific thrust are not considered responsive. In other words, immune and inflammatory pathways can be part of the story, but the lymphatic vessel biology itself needs to be the primary focus.

This FOA uses the NIH R21 mechanism, which is built for exploratory work where the goal is to open up a new line of inquiry, test a novel concept, or generate key preliminary data rather than to complete a mature, fully developed research program. In practical terms, the R21 format is a better fit for studies that are hypothesis-generating, method-developing, or designed to establish feasibility in emerging areas of lymphatic research within these organ systems. The award information provided indicates an award ceiling of $125,000, and there is no cost sharing or matching requirement, which reduces the burden on applicants and makes it easier to propose focused, high-yield aims.

From a scientific scope standpoint, the opportunity is centered on lymphatic vessel physiology and pathophysiology in the context of digestion, cardiopulmonary function, vascular disease, and related complications. That includes understanding the factors that shape "functional anatomy" of lymphatics in specific tissues, meaning not just where vessels are located, but how their architecture, permeability, pumping behavior, and fluid handling are tuned to the needs of an organ at baseline and during disease. The FOA is also interested in mechanistic links between altered lymphatic function and downstream effects on organ function, which could include how disrupted lymph drainage, impaired vessel remodeling, or abnormal lymphatic contractility contributes to tissue edema, changes in local biochemical signaling, altered lipid handling in the gut, or impaired recovery after injury. It explicitly calls out thromboembolic event resolution as an area of interest, pointing to the broader clinical relevance of lymphatic function in clearing inflammatory mediators, interstitial fluids, and possibly influencing the tissue environment in ways that affect clot resolution and healing.

The opportunity is categorized under NIH research areas that include cardiovascular diseases (CFDA 93.837), lung diseases (93.838), blood diseases and resources (93.839), and diabetes/digestive/kidney diseases extramural research (93.847). That spread signals an intentionally cross-cutting program that sits at the intersection of multiple NIH mission areas, reflecting the idea that lymphatic vessels are not a niche topic but a foundational system influencing many disease pathways across organs. Even though lymphatics are often discussed in relation to immunity, this FOA is careful to steer applicants toward lymphatic vessel biology as the lead topic, such as vessel development, maintenance, remodeling, drainage capacity, transport properties, tissue-specific regulation, and how those attributes change with disease and in turn reshape organ function.

Eligibility is broad and includes a wide range of domestic U.S. organizations and governmental entities, such as state and local governments, tribal governments and organizations, public and private institutions of higher education, independent school districts, public housing authorities, nonprofits (including both 501(c)(3) and certain non-501(c)(3) organizations), and for-profit organizations (other than small businesses are explicitly listed, and small businesses are also eligible). The FOA also makes it clear that foreign participation is allowed: non-U.S. (foreign) institutions may apply, non-domestic components of U.S. organizations may apply, and foreign components are permitted as defined by NIH policy. Additional eligible applicant types listed include Alaska Native and Native Hawaiian Serving Institutions, Hispanic-serving institutions, HBCUs, tribally controlled colleges and universities, faith-based or community-based organizations, U.S. territories or possessions, and certain regional organizations. This breadth is meant to bring in diverse expertise, including institutions with specialized capabilities in imaging, vascular biology, organ physiology, biomaterials, microfluidics, translational models, or clinical partnerships relevant to digestive and cardiopulmonary diseases.

Administratively, the opportunity is a discretionary grant with a posted and creation date of August 8, 2012. The original and current closing date listed is September 7, 2013, with an archive date of October 8, 2013, meaning this specific announcement is now historical rather than open for new submissions under that exact posting. The sponsoring agency is the National Institutes of Health. For applicants or readers seeking the full announcement text, the FOA provides a link to the NIH Grants Guide page (http://grants.nih.gov/grants/guide/pa-files/PAR-12-260.html) and includes contact directions through the NIH Office of Extramural Research webmaster for access or linking issues.

Taken together, this FOA is best understood as an NIH call for early, creative research projects that will clarify how lymphatic vessels shape disease and recovery in the gut, heart and vasculature, and lungs. It invites investigators to look closely at tissue-specific lymphatic structure and function, identify the drivers of lymphatic changes in disease, and map how those changes translate into clinically meaningful outcomes, while keeping the main emphasis on lymphatic vessel physiology and pathology rather than immune system mechanisms as the primary research centerpiece.

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Previous opportunity: Lymphatics in Health and Disease in the Digestive, Urinary, Cardiovascular and Pulmonary Systems (R01)

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