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Studying the Hypothalamic Insulin Signal to Peripheral Glucose Intolerance with a Continuous Drug Infusion System into the Mouse Brain
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SMTP-44D Improves High Glucose-Induced Vascular Endothelial Dysfunction.

Shiori Jono1,2, Ryosuke Shinouchi1,2, Takashi Obama3

  • 1Department of Pharmacology, Showa Medical University Graduate School of Pharmacy, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.

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Stachybotrys microspora triprenyl phenol-44D (SMTP-44D) protects against diabetic vascular endothelial dysfunction. This fungus-derived compound improves cell viability and nitric oxide levels, offering a potential new treatment for diabetic complications.

Keywords:
Stachybotrys microspora triprenyl phenol-44Ddiabetic endothelial dysfunctionhuman umbilical vein endothelial cellhyperglycemianitric oxidesoluble epoxide hydrolase

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Endocrinology

Background:

  • Chronic diabetic complications are often linked to vascular disorders.
  • Current treatments for diabetic vascular complications are limited.
  • Soluble epoxide hydrolase (sEH) plays a role in vascular homeostasis.

Purpose of the Study:

  • To investigate the therapeutic potential of Stachybotrys microspora triprenyl phenol-44D (SMTP-44D) on high glucose-induced endothelial dysfunction.
  • To elucidate the mechanisms underlying SMTP-44D's effects on human umbilical vein endothelial cells (HUVECs).

Main Methods:

  • HUVECs were cultured and treated with high glucose (30 mM) and SMTP-44D.
  • Cell viability, nitric oxide (NO) levels, intracellular reactive oxygen species (ROS), and Akt activation were assessed.
  • The study utilized a high glucose treatment model for HUVECs.

Main Results:

  • High glucose significantly reduced HUVEC viability and nitric oxide levels, while increasing ROS and decreasing Akt activation.
  • SMTP-44D treatment restored HUVEC viability to 111% and nitric oxide levels to 82% under high glucose conditions.
  • SMTP-44D effectively counteracted high glucose-induced oxidative stress and modulated the phosphoinositide 3-kinase (PI3K)/Akt signaling pathway.

Conclusions:

  • SMTP-44D demonstrates significant protective effects against diabetic vascular endothelial dysfunction.
  • The compound acts by mitigating oxidative stress and influencing the PI3K/Akt pathway.
  • SMTP-44D shows promise as a novel therapeutic and preventive agent for diabetic complications.