Molecular Mechanisms of Combination Adjuvants (MMCA) (R01 Clinical Trial Not Allowed) | RFA AI 25 006

Opportunity Information: Apply for RFA AI 25 006

The Molecular Mechanisms of Combination Adjuvants (MMCA) funding opportunity (RFA AI 25 006) is a National Institutes of Health (NIH) discretionary grant program that uses the R01 research project mechanism and explicitly does not allow clinical trials. It is focused on basic and translationally oriented mechanistic research that explains how two or more vaccine adjuvants work together when used as a combination. Rather than simply showing that an adjuvant mix improves immune responses, the emphasis is on identifying and explaining the underlying molecular and cellular processes that emerge when multiple immune modulators are combined, including any synergistic, additive, or antagonistic interactions. A key requirement is that every adjuvant included in a proposed combination must already have demonstrated immune-modulating activity, meaning the program is not intended for testing entirely unproven adjuvant candidates from scratch, but for clarifying how known immunostimulatory components behave in concert.

The scientific purpose is tied to a longer-term practical goal: improving rational vaccine design by making immune outcomes more predictable. In other words, the program aims to move the field beyond trial-and-error mixing of adjuvants and toward a more principled ability to forecast what kind of immune profile (for example, antibody magnitude and quality, T cell polarization, innate signatures, durability, mucosal features, or breadth) a given combination is likely to elicit. Mechanistic insight is the centerpiece here, so projects would typically be expected to generate evidence about pathways, receptors, signaling networks, innate sensing events, antigen-presenting cell programming, tissue microenvironments, or systems-level signatures that can explain why certain combinations drive specific immune phenotypes. The overall theme is that combination adjuvants can create emergent biology not seen with single components, and this NOFO is designed to fund studies that can map that biology in a way that supports prediction and design.

Administratively, this opportunity is listed under CFDA 93.855 and is categorized in the Health funding activity area. The original application closing date provided is 2025-06-10, and the NOFO was created on 2025-01-13. While the summary information shown does not specify an award ceiling or the expected number of awards, the mechanism being an NIH R01 generally implies substantial multi-year support for a defined research plan, subject to NIH policies and the specific budget and project period requested and justified by the applicant.

Eligibility is broad and includes many organization types across government, academia, nonprofit, and industry. Eligible applicants include state, county, and city or township governments; special district governments; independent school districts; public and state-controlled institutions of higher education; private institutions of higher education; Native American tribal governments (federally recognized); tribal organizations that are not federally recognized tribal governments; public housing authorities and Indian housing authorities; nonprofits with and without 501(c)(3) status (when not part of an institution of higher education); for-profit organizations other than small businesses; and small businesses. The NOFO also highlights additional eligible applicant categories such as Alaska Native and Native Hawaiian Serving Institutions; Asian American Native American Pacific Islander Serving Institutions (AANAPISIs); Hispanic-serving Institutions; Historically Black Colleges and Universities (HBCUs); Tribally Controlled Colleges and Universities (TCCUs); faith-based or community-based organizations; eligible federal agencies; regional organizations; U.S. territories or possessions; and non-domestic (non-U.S.) entities (foreign organizations). Taken together, that eligibility language signals an intent to attract diverse research performers and settings, including domestic and international groups capable of mechanistic immunology, vaccinology, and related systems biology work.

In practical terms, an application responsive to this NOFO would be expected to center on a clearly defined combination of at least two established immune-modulating adjuvants and propose experiments that dissect how the combination reshapes innate and adaptive immune programming compared with each component alone. Because clinical trials are not allowed, the work would be positioned in preclinical models, ex vivo human systems, in vitro platforms, and/or computational and systems immunology approaches, depending on what is justified for mechanistic clarity. The program is ultimately aimed at producing mechanistic rules, models, or signatures that help the field anticipate immune outcomes from combination adjuvants, thereby improving how next-generation vaccines are designed and optimized.

• The National Institutes of Health in the health sector is offering a public funding opportunity titled "Molecular Mechanisms of Combination Adjuvants (MMCA) (R01 Clinical Trial Not Allowed)" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.855.
• This funding opportunity was created on 2025-01-13.
• Applicants must submit their applications by 2025-06-10. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

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