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Variecolactone, a Natural PDE4 Inhibitor from Marine-Derived Talaromyces sp. ZSD-1, Alleviates Amyloid-β Accumulation

Tingting Fu1, Yujia Shi1, Zhonglin Yang1

  • 1Key Laboratory of Tropical Biological Resources of Ministry of Education, School of Pharmaceutical Sciences, Hainan University, Haikou 570225, China.

Biomolecules
|May 4, 2026
PubMed

Insights

Marine fungi yielded variecolactone (VLT), a potent phosphodiesterase 4 (PDE4) inhibitor. VLT shows promise for treating Alzheimer

Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) pathology involves amyloid-β (Aβ) plaques, neuroinflammation, and mitochondrial dysfunction.
  • Phosphodiesterase 4 (PDE4) is a key regulator of cyclic nucleotides in neurons and a potential therapeutic target for AD.

Purpose of the Study:

  • To identify novel phosphodiesterase 4 (PDE4) inhibitors from marine natural products for Alzheimer's disease (AD) therapy.
  • To investigate the neuroprotective mechanisms of the identified compound, variecolactone (VLT).

Main Methods:

  • Screening of a marine fungal natural product library for PDE4 inhibition.
  • Biochemical assays to determine PDE4 subtype selectivity and potency (IC50).
  • Cell-based assays in an AD model to assess effects on cAMP, p-CREB, Aβ accumulation, synaptic function, and mitochondrial homeostasis.

Main Results:

  • Variecolactone (VLT) was identified as a selective PDE4D inhibitor.
  • VLT treatment increased cAMP and p-CREB levels, reduced Aβ deposition, improved synaptic function, and restored mitochondrial homeostasis in an AD cell model.
  • VLT demonstrated neuroprotection and maintained mitochondrial DNA (mtDNA) homeostasis via the cAMP-PKA-CREB pathway under stress conditions.

Conclusions:

  • Variecolactone (VLT), a marine natural product, is a potent PDE4 inhibitor with significant neuroprotective effects.
  • PDE4 inhibition by VLT offers a promising therapeutic strategy for Alzheimer's disease and other neurodegenerative disorders.
Keywords:
Alzheimer’s diseasePDE4 inhibitoramyloid-βmitochondrial functionvariecolactone

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