What Is Jasplakinolide? Definition and What Research Reports

Definition

Jasplakinolide is a macrocyclic depsipeptide natural product, originally isolated from marine sponges of the genus Jaspis, that binds to filamentous actin (F-actin) and is used in cell and molecular biology as a chemical tool to promote actin polymerisation and stabilise existing filaments. In the laboratory it functions as the conceptual opposite of filament-disrupting agents such as the cytochalasins and latrunculins: where those compounds prevent or reverse polymerisation, jasplakinolide is applied to push the actin system toward the assembled, filamentous state. It is sold and handled strictly as a research reagent, has no approved human or veterinary product, and appears in the published literature almost exclusively as an experimental perturbation used to ask whether a measured cellular behaviour depends on the actin cytoskeleton.

This page is for educational purposes only and is not medical advice; consult a licensed physician for any health decision. Nothing here describes or implies human use.

Molecular class and origin

Chemically, jasplakinolide belongs to the cyclodepsipeptides — cyclic molecules built from amino acid residues joined by both amide (peptide) and ester ("depsi") bonds. That mixed backbone is why it is often grouped loosely with "peptides" in reagent catalogues and glossaries even though it is not a linear, biosynthetically conventional peptide hormone or receptor agonist. Its structure includes non-standard amino acid residues and a polyketide-derived macrocyclic segment, which gives the molecule the rigid, membrane-permeable shape that distinguishes it from most peptide research compounds.

Its natural source is marine: jasplakinolide was described from sponge material, and it sits within the broader family of sponge- and microorganism-derived cytoskeletal natural products. Because it crosses cell membranes, it can be applied to intact living cells rather than only to purified protein preparations — one of the main practical reasons it became a standard cytoskeletal reagent.

How it is categorised in glossaries

• Class: macrocyclic depsipeptide (peptide-like natural product)
• Molecular target: filamentous actin
• Typical laboratory role: actin-polymerising / filament-stabilising probe
• Status: research-use-only reagent; no approved therapeutic product
• Common comparison compounds: cytochalasin D, latrunculin A/B (filament-disrupting), phalloidin (filament-binding stain)

How the term is used in peptide and cell research

In practice, "jasplakinolide" appears in methods sections rather than in outcome sections. Investigators studying a signalling pathway, a differentiation programme, a migration behaviour, or a membrane event will treat cells with an actin-stabilising agent and a filament-disrupting agent in parallel, then ask whether the readout moves in opposite directions. If it does, the interpretation is that the readout is sensitive to actin filament dynamics. The compound is therefore a tool for causal inference about the cytoskeleton, not a candidate drug and not a peptide therapeutic.

A second usage is chemical: the actin-binding pharmacophore of jasplakinolide-type molecules has been of interest to probe chemists who want fluorescent labels that report on actin inside living cells. A 2025 report in Angewandte Chemie described SiR-XActin, a fluorescent probe developed for imaging actin dynamics in live cells, and the researchers positioned it as a tool for following filament behaviour in real time rather than in fixed samples (PMID 41099126).

What the published literature reports

Because jasplakinolide is used as a perturbation, the literature that features it is a literature about actin dynamics. Several themes recur.

Actin state as a regulator of cell fate and signalling

Work in human adipose-derived stem cells examined whether the polymerisation state of actin regulates osteogenic differentiation, and the study reported that shifting the balance between monomeric and filamentous actin altered the differentiation programme (PMID 33858321). Related work in kidney biology investigated palladin, an actin-associated protein, in podocytes, where researchers linked the actin cross-linking machinery to the structural integrity of these specialised cells (PMID 29720549). In neuroscience, a 2023 report described presynaptic plasticity as being associated with actin polymerisation, again using filament-state manipulation to connect cytoskeletal chemistry to a functional output (PMID 37076285).

Actin dynamics in cancer and vascular cell biology

A 2023 study in human breast cancer cells reported that cofilin, an actin-severing and depolymerising factor, promoted vasculogenic mimicry by regulating the actin cytoskeleton (PMID 36737242). A 2020 report in Cytoskeleton described the invasion of endothelial sprouts into collagen as actomyosin-dependent, tying filament assembly and contractility to three-dimensional invasion (PMID 32588525). Earlier work reported that GSTΠ stimulated caveolin-1-regulated polyamine uptake via actin remodelling, placing filament turnover upstream of a transport process (PMID 31620246). A 2026 Theranostics report on prostate cancer described a primary-cilium-driven neuroendocrine shift involving YAP1 repression and reduced mitochondrial activity, in a field where cytoskeletal tension is a recognised input to YAP signalling (PMID 42244995).

Membrane events and blood cells

In platelet biology, a 2022 Platelets study reported that actin polymerisation regulated shedding of the receptor glycoprotein Ibα, an example of filament state influencing a proteolytic surface event rather than only cell shape (PMID 33979555).

Comparative and parasite actin

Not all actins behave alike, and that is directly relevant to how filament-stabilising reagents are interpreted. A 2024 Nature Communications study reported that Toxoplasma gondii actin filaments are tuned for rapid disassembly and turnover, describing a filament system with markedly different kinetics from conventional vertebrate actin (PMID 38418447). Separately, researchers examining how the form and function of actin affects actin health and ageing released the work first as a 2025 preprint (PMID 41332730) and then in iScience in 2026 (PMID 42668575), framing actin structure itself as a variable in cellular ageing.

Cellular Toxicity and Off-Target Concerns: What Studies Report

Jasplakinolide has not been studied as a human therapeutic, so there is no clinical adverse-event literature to summarise, and no published human dosing exists to describe. What the cytoskeletal literature does make clear is that locking actin into the filamentous state is not a neutral manipulation: filament turnover is required for division, migration, endocytosis and synaptic function, so experiments that stabilise filaments are expected to disturb those processes. The report that T. gondii filaments are tuned for rapid disassembly and turnover illustrates how central controlled disassembly is to cell behaviour (PMID 38418447), and work reporting that actin polymerisation state regulated osteogenic differentiation shows that shifting that balance changes cell fate decisions (PMID 33858321). For that reason, published work using actin-stabilising reagents typically pairs them with disrupting agents and vehicle controls, and interprets results as evidence about pathway dependence rather than as a description of a benign intervention.

Regulatory and status notes

Jasplakinolide is distributed as a research-use-only (RUO) chemical reagent. It has no marketing authorisation as a drug in any jurisdiction, it is not a dietary ingredient, and it is not a compounded medication. RUO labelling means a material is intended for laboratory investigation and has not been evaluated for safety or effectiveness in humans. Readers encountering the term in a peptide context should note that its inclusion in "peptide" lists reflects its depsipeptide chemistry, not any history of clinical use.

Quick reference

References

• Form and function of actin impacts actin health and aging (bioRxiv, 2025)
• Form and function of actin impacts actin health and aging (iScience, 2026)
• Actin polymerization regulates glycoprotein Ibα shedding (Platelets, 2022)
• Toxoplasma gondii actin filaments are tuned for rapid disassembly and turnover (Nature Communications, 2024)
• SiR-XActin: A Fluorescent Probe for Imaging Actin Dynamics in Live Cells (Angewandte Chemie International Edition, 2025)
• Primary Cilium Forces Neuroendocrine Shift in Prostate Cancer through YAP1 Repression and Reduced Mitochondrial Activity (Theranostics, 2026)
• GSTΠ stimulates caveolin-1-regulated polyamine uptake via actin remodeling (Oncotarget, 2019)
• Actomyosin-dependent invasion of endothelial sprouts in collagen (Cytoskeleton, 2020)
• Cofilin promotes vasculogenic mimicry by regulating the actin cytoskeleton in human breast cancer cells (FEBS Letters, 2023)
• The Role of Palladin in Podocytes (Journal of the American Society of Nephrology, 2018)
• Presynaptic Plasticity Is Associated with Actin Polymerization (Biochemistry (Moscow), 2023)
• Actin polymerization state regulates osteogenic differentiation in human adipose-derived stem cells (Cellular & Molecular Biology Letters, 2021)