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Cordycepin, also known as 3'-deoxyadenosine, is a nucleoside analog of adenosine in which the hydroxyl group at the 3' position of the sugar is replaced by hydrogen. It was first isolated in 1950 from the entomopathogenic fungus Cordyceps militaris, and it also occurs in related fungi and can now be produced synthetically. Because it closely resembles adenosine, cordycepin can slip into biochemical pathways in place of the natural nucleoside, an ability that underlies its studied antitumor, anti-inflammatory, and antiviral properties.
- Activates AMPK and the NRF2 antioxidant response
- Improved cognition in Alzheimer's model mice
- Neuroprotective after traumatic brain injury in animals
- Shifts immune cells toward an anti-inflammatory state
- Prevented radiation-induced tissue senescence in rodents
- Anti-proliferative across multiple cancer cell models
- Raises hippocampal LTP, dendrite length and spine density via A2A downregulation
- Mild digestive upset reported with Cordyceps supplements
- Possible additive effect with blood-thinning drugs
- Caution alongside immunosuppressant therapy
Overview
Cordycepin is a purine nucleoside and a structural cousin of adenosine, differing only by the loss of the 3'-hydroxyl group on the ribose ring [1]. That small change turns the molecule into a chain terminator, since a nucleotide lacking a 3'-hydroxyl cannot form the next bond in a growing nucleic acid strand [1].
The compound was first obtained in 1950 by Cunningham and colleagues, who purified it from cultures of Cordyceps militaris and described it in Nature [1]. C. militaris is a caterpillar-infecting fungus long valued in traditional East Asian medicine, and cordycepin is regarded as one of its signature bioactive constituents [2]. Beyond this species, several related fungi are now known to make the molecule, and modern supply relies heavily on fermentation and chemical synthesis [1].
A practical challenge is that the enzyme adenosine deaminase rapidly converts cordycepin into an inactive form, just as it does with adenosine [2]. Inside the fungus this vulnerability is offset by pentostatin, a second natural product produced alongside cordycepin that inhibits adenosine deaminase and shields the molecule from breakdown [2]. This natural pairing has informed laboratory strategies that combine cordycepin with a deaminase inhibitor to prolong its activity [2].
Research has examined cordycepin across several areas, most of it preclinical. It has drawn interest as a possible rapid-acting antidepressant; in rodent studies a single dose produced fast mood-related behavioral changes linked to strengthened AMPA receptor signaling in the prefrontal cortex [3]. Other work identified the chromatin-associated protein RUVBL2 as a target through which cordycepin can shift the mammalian circadian clock, an effect explored in models of jet lag [4]. Additional studies report anti-inflammatory and neuroprotective actions, including a push of microglia toward a reparative state in models of Alzheimer's disease [5], alongside a broad literature on antitumor and antiviral effects [2].
Cordycepin is not an approved medicine, and human clinical evidence remains limited [5]. It is encountered chiefly as a research chemical and as a marketed constituent of Cordyceps mushroom supplements, sold as powdered fungal biomass, standardized extracts, and isolated compound [1][2].
Mechanism
Cordycepin works largely by masquerading as . Enzymes that normally handle adenosine and its nucleotides often fail to tell the two apart, so cordycepin can be phosphorylated and incorporated into RNA [1]. Because the molecule lacks the 3'-hydroxyl needed to attach the following nucleotide, its incorporation prematurely halts elongation of the RNA chain and interferes with transcription and polyadenylation [1]. This disruption of RNA synthesis is thought to drive much of its antiproliferative and anti-inflammatory activity [2].
Cordycepin and its metabolites also engage -linked signaling and can activate AMP-activated protein kinase (), a central cellular energy sensor, while a phosphorylated form binds and disassembles complexes containing the clock protein RUVBL2 to reset circadian timing [4]. In neural tissue its antidepressant-like effects have been traced to greater phosphorylation and delivery of -type receptor subunits [3], and in it favors a shift in metabolism associated with a neuroprotective state [5]. Its activity is naturally curbed by deaminase, which converts cordycepin to an inactive deoxyinosine derivative unless a deaminase inhibitor such as pentostatin is present [2].
receptor fingerprint
RNA polyadenylationIncorporates into RNA and terminates the chain
Binds near the autoinhibitory domain to activate the enzyme
Microglial polarizationShifts microglia and macrophages toward a resolving M2 state
A2A receptor (A2AR)downregulates A2AR in the hippocampus, sparing A1
Safetyrisks and cautions, not medical advice
Cordycepin (3'-deoxyadenosine) is largely a preclinical compound; in beagle-dog studies cordycepin given alone produced no drug-related toxicities, in part because adenosine deaminase (ADA) rapidly converts it to inactive 3'-deoxy-inosine, limiting systemic accumulation. The critical documented risk is combination-dependent: paired with an ADA inhibitor (such as pentostatin/2'-deoxycoformycin), cordycepin caused severe gastrointestinal toxicity (weight loss, emesis, diarrhea, GI-tract necrosis) and bone-marrow toxicity in dogs, so co-administration with ADA inhibitors is the key danger.
Because ADA activity dictates exposure, effects can vary with individual enzyme levels. Robust human safety and dosing data are lacking, and material sold as a supplement or research chemical is of unverified purity. It should be treated as an experimental agent whose toxicity climbs sharply once its deactivation pathway is blocked.
Subjective profileweighing the evidence above
A genuinely interesting adenosine analog, but temper expectations. It ramps hippocampal plasticity and carries a broad anti-inflammatory, AMPK-driven profile, yet the LTP gains did not show up as better learning, and adenosine deaminase shreds it within minutes, so ordinary Cordyceps extracts deliver far less than the study doses.
Resources
This entry is here for reference.
Research
- 1950first citedCordycepin, a metabolic product isolated from cultures of Cordyceps militaris (Linn.) Link.
- 2024most recentCordycepin Modulates Microglial M2 Polarization Coupled with Mitochondrial Metabolic Reprogramm…
- 1.Cordycepin, a metabolic product isolated from cultures of Cordyceps militaris (Linn.) Link.
- 2.Fungal Cordycepin Biosynthesis Is Coupled with the Production of the Safeguard Molecule Pentostatin
- 3.3'-Deoxyadenosine (Cordycepin) Produces a Rapid and Robust Antidepressant Effect via Enhancing Prefrontal AMPA Receptor Signaling Pathway
- 4.Chemical perturbations reveal that RUVBL2 regulates the circadian phase in mammals
- 5.Cordycepin Modulates Microglial M2 Polarization Coupled with Mitochondrial Metabolic Reprogramming by Targeting HKII and PDK2
5 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Why does cordycepin have such a short half-life?
The enzyme adenosine deaminase strips it almost immediately into a largely inactive metabolite, so blood levels drop within minutes.
Does a Cordyceps supplement give a meaningful dose?
Usually far less than the injected amounts used in animal studies, so effects from ordinary extracts are likely modest.
How does it activate AMPK?
It binds near AMPK's autoinhibitory region to switch the enzyme on, which then drives autophagy and the NRF2 antioxidant pathway.
Is there human clinical evidence?
Minimal for isolated cordycepin; most findings are cell and rodent studies, so benefits should be read as preclinical.
Does cordycepin actually improve memory?
It is mixed. It clearly boosts hippocampal LTP and dendritic complexity by downregulating the A2A receptor, but in the same study that did not translate into better Y-maze learning. So the plasticity effects are real, yet cordycepin is not a clean memory enhancer, and poor bioavailability limits it further.
Limitations of the evidence
- Human safety data limited; mostly preclinical
Adverse effects
- Mild digestive upset reported with Cordyceps supplements
- Possible additive effect with blood-thinning drugs
- Caution alongside immunosuppressant therapy
Notes and cautions
- Rapidly inactivated in the body by adenosine deaminase