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Updated: Sep 14, 2025

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Ubiquitous calpains show differential dynamics and function during adipocyte differentiation.

L Rodríguez-Fernández1, R Zaragozá2, J R Viña3

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|July 23, 2025
PubMed
Summary

Calpains, calcium-dependent proteases, are crucial for adipogenesis. This study reveals calpain-1 (CAPN1) cleaves histone H3, enabling cell cycle exit and adipocyte differentiation, highlighting therapeutic potential for metabolic disorders.

Keywords:
3T3-L1-differentiationCalpain-2CleavageHistone H3Nuclear calpain-1

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cellular Biology
  • Metabolic Research

Background:

  • Adipose tissue homeostasis is vital, with disruptions linked to endocrine dysfunction and disease.
  • Calpains are calcium-dependent proteases influencing adipogenesis, but isoform-specific roles are unclear.
  • Understanding calpain function is key to addressing obesity and metabolic disorders.

Purpose of the Study:

  • To investigate the isoform- and phase-specific roles of calpain-1 (CAPN1) and calpain-2 (CAPN2) in 3T3-L1 preadipocyte differentiation.
  • To elucidate the molecular mechanisms by which calpains regulate adipogenesis.
  • To identify calpains as potential therapeutic targets for metabolic diseases.

Main Methods:

  • Hormonally induced differentiation of 3T3-L1 preadipocytes.
  • Analysis of calpain isoform expression, activity, and localization.
  • Depletion studies using siRNA, cell cycle analysis, and Western blotting.
  • Immunofluorescence, proximity ligation assays, and histone H3 cleavage assays.

Main Results:

  • Both CAPN1 and CAPN2 were upregulated and redistributed during differentiation.
  • Depletion of CAPN1 or CAPN2 impaired cell cycle exit and adipocyte differentiation.
  • CAPN1 was identified as the primary isoform responsible for histone H3 cleavage, a key event in chromatin remodeling.
  • Calpain inhibition prevented histone H3 cleavage, confirming CAPN1's role.

Conclusions:

  • Calpains play critical, phase-specific roles in the adipogenic program.
  • CAPN1-mediated histone H3 cleavage is essential for the transition from mitotic clonal expansion to early differentiation.
  • Calpains represent promising therapeutic targets for obesity and related metabolic disorders.