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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
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HSP90 Inhibition Disrupts 27-Hydroxycholesterol-Induced Inflammatory Signaling in Monocytic Cells.

Jaesung Kim1, Munju Kwon2, Dongha Park1

  • 1Department of Pharmacology, School of Medicine, Pusan National University, Yangsan 50612, Republic of Korea.

International Journal of Molecular Sciences
|October 29, 2025
PubMed
Summary
This summary is machine-generated.

Heat shock protein 90 (HSP90) inhibition with ganetespib reduces cholesterol metabolite 27-hydroxycholesterol (27OHChol)-induced inflammation in monocytic cells. This targeted approach suppresses key inflammatory pathways, offering potential therapeutic benefits for metabolic inflammation.

Keywords:
27-hydroxycholesterolAkt/mTORC1heat shock protein 90inflammationmonocytic cell activation

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Area of Science:

  • Biochemistry
  • Immunology
  • Cell Biology

Background:

  • 27-Hydroxycholesterol (27OHChol), a cholesterol metabolite, promotes monocytic cell inflammation and differentiation into dendritic cells.
  • Heat shock protein 90 (HSP90) is implicated in regulating cellular inflammatory responses.

Purpose of the Study:

  • To investigate the effect of HSP90 inhibition on 27OHChol-induced inflammatory responses in monocytic cells.
  • To elucidate the molecular mechanisms underlying HSP90's role in 27OHChol-driven inflammation.

Main Methods:

  • Treatment of monocytic cells with 27OHChol and ganetespib, a selective HSP90 inhibitor.
  • Assessment of chemokine (CCL2) and matrix metalloproteinase-9 (MMP-9) expression.
  • Analysis of mature dendritic cell markers (CD80, CD83, CD88) and endocytic activity.
  • Investigation of signaling pathway phosphorylation, specifically the Akt/mTORC1 axis.

Main Results:

  • Ganetespib significantly reduced CCL2 and MMP-9 expression, decreasing monocytic cell migration and LPS response.
  • HSP90 inhibition attenuated the expression of mature dendritic cell markers and restored endocytic activity.
  • 27OHChol enhanced Akt/mTORC1 pathway phosphorylation; ganetespib reduced Akt and 4E-BP1 levels and selectively inhibited S6 phosphorylation.

Conclusions:

  • HSP90 inhibition by ganetespib effectively mitigates 27OHChol-induced monocytic cell activation.
  • The HSP90-Akt/mTORC1 axis is a critical regulator of 27OHChol-driven inflammation.
  • Targeting this pathway presents a potential therapeutic strategy for oxysterol-associated metabolic inflammation.