The Role of the Cytoskeleton in Cellular Aging (R21/R33) | Apply Online

Opportunity Summary:

The funding opportunity PAR-13-301, titled "The Role of the Cytoskeleton in Cellular Aging (R21/R33)," is a National Institutes of Health (NIH) discretionary grant program in the health category (CFDA 93.866, Aging Research) designed to push forward creative, high-impact research on how the cytoskeleton changes as cells age. The central goal is to stimulate innovative strategies that reveal the molecular and cellular mechanisms behind age-related remodeling or dysfunction of cytoskeletal systems, and to clarify how those shifts contribute to the broader biology of aging and to age-related diseases. In practical terms, the program is looking for studies that move beyond descriptive observations and instead generate new concepts, tools, or mechanistic insights into how the cytoskeleton helps drive or respond to aging inside cells.

A major emphasis of the announcement is on understanding how aging affects cytoskeletal structure and function. That includes work on the core cytoskeletal networks (for example, actin filaments, microtubules, intermediate filaments, and their associated binding proteins and motors) and how their organization, dynamics, mechanical properties, and regulatory control change over time. The FOA also encourages proposals that connect cytoskeletal aging to functional consequences, such as altered cell polarity, migration, adhesion, mechanotransduction, intracellular transport, and stress responses. Applicants are invited to examine signaling pathways and regulatory molecules that govern cellular architecture, which can include kinases, phosphatases, small GTPases, scaffolding proteins, and other modulators that tune cytoskeletal assembly and remodeling. The underlying idea is that age-related shifts in regulation may explain why older cells often show different structural behavior and responsiveness than younger cells.

Another key theme is the cytoskeleton as an organizer of intracellular communication, particularly through its role in organelle positioning and organelle-organelle interactions. The NIH is explicitly interested in how cytoskeletal changes influence interactions among intracellular organelles, which could include processes like mitochondrial trafficking and morphology, endoplasmic reticulum distribution, lysosome movement, autophagy-related transport, and general vesicle and cargo delivery. Because organelles depend heavily on cytoskeletal tracks and motors for movement and spatial organization, the FOA encourages studies that link cytoskeletal aging to downstream impacts on organelle function, cellular metabolism, proteostasis, and stress adaptation.

The announcement also highlights interest in nuclear-cytoplasmic communication and spatiotemporal relationships as cells age. This captures research directions where the cytoskeleton is studied not just as a structural framework, but as a system that helps coordinate timing and spatial patterning of signals across the cell, including communication between the nucleus and cytoplasm. This can involve investigation of how the cytoskeleton affects nuclear positioning, nuclear envelope integrity, nucleo-cytoskeletal coupling, transport of signaling molecules, and the transmission of mechanical forces that influence gene expression programs. The FOA encourages exploring how such spatiotemporal coordination breaks down with age, and how that breakdown may contribute to functional decline or disease processes.

Mechanistically, the program is broad and open to a range of experimental systems and approaches, as long as the work is aimed at aging-relevant cytoskeletal biology and is grounded in innovative strategy. Projects could focus on normal aging processes, accelerated aging models, or specific age-related diseases where cytoskeletal disruption is suspected to play a role. The announcement’s language suggests the NIH is looking for proposals that can illuminate causal relationships, identify new regulatory nodes, or establish new conceptual frameworks for understanding how cytoskeletal alterations intersect with cellular aging hallmarks.

In terms of administrative and eligibility details, this is an NIH grant opportunity using the R21/R33 mechanism, which generally supports exploratory early-stage research (R21) that can transition into a second phase (R33) if milestones are met, enabling promising ideas to mature into more developed programs. The award ceiling listed in the source data is $200,000, and there is no cost sharing or matching requirement. The FOA was posted on August 1, 2013, with an original and final closing date of September 7, 2016, and an archive date of October 8, 2016, indicating it is no longer open but remains a useful reference for similar current NIH initiatives.

Eligibility is notably broad. Eligible applicants include many types of U.S. entities such as small businesses, for-profit organizations (other than small businesses), nonprofits (including 501(c)(3) and non-501(c)(3) organizations), public and private institutions of higher education, and multiple levels of government (state, county, city/township), as well as special district governments, independent school districts, and public housing authorities/Indian housing authorities. The FOA also explicitly includes a wide range of mission-driven and capacity-building institutions and organizations, such as Historically Black Colleges and Universities (HBCUs), Hispanic-serving Institutions, Tribally Controlled Colleges and Universities (TCCUs), Alaska Native and Native Hawaiian Serving Institutions, and Asian American Native American Pacific Islander Serving Institutions (AANAPISIs), along with faith-based or community-based organizations and eligible federal agencies. Importantly, foreign organizations and foreign institutions are eligible to apply, non-U.S. components of U.S. organizations are eligible, and foreign components as defined by the NIH Grants Policy Statement are allowed, which underscores NIH interest in globally relevant, high-quality science in this space.

For applicants who want the complete official announcement and all requirements, the NIH provided the full FOA text at http://grants.nih.gov/grants/guide/pa-files/PAR-13-301.html, and technical access issues were directed to the NIH Office of Extramural Research (OER) webmaster contacts listed in the notice.

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