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Related Experiment Video

Updated: Jun 21, 2026

Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury

Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury

Published on: March 7, 2022

Both endogenous and exogenous testosterone decrease myocardial STAT3 activation and SOCS3 expression after acute

Meijing Wang¹, Yue Wang, Aaron Abarbanell

¹Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA.

|July 25, 2009

Summary

This summary is machine-generated.

Testosterone reduces cardioprotective STAT3 and SOCS3 signaling in the heart after ischemia. This study shows testosterone's role in downregulating myocardial STAT3/SOCS3, impacting heart function post-injury.

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Last Updated: Jun 21, 2026

Improved Rodent Model of Myocardial Ischemia and Reperfusion Injury

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Published on: March 7, 2022

A Microscopic 2,3,5-Triphenyltetrazolium Chloride Assay for Accurate and Reliable Analysis of Myocardial Injury

A Microscopic 2,3,5-Triphenyltetrazolium Chloride Assay for Accurate and Reliable Analysis of Myocardial Injury

Published on: November 28, 2025

Area of Science:

Cardiovascular Physiology
Endocrinology
Molecular Biology

Background:

The Signal Transducer and Activator of Transcription 3 (STAT3) pathway is cardioprotective.
Male hearts show decreased STAT3/Suppressor of Cytokine Signaling 3 (SOCS3) and worse function post-ischemia compared to females.
The role of testosterone in this observed downregulation is unclear.

Purpose of the Study:

To investigate if endogenous testosterone decreases myocardial STAT3 and SOCS3 in males after ischemia/reperfusion (I/R).
To determine if exogenous testosterone reduces myocardial STAT3/SOCS3 in females and castrated males after I/R.

Main Methods:

Hearts from I/R injury models were analyzed for STAT3, SOCS3, and GAPDH using Western blot.
Groups included adult males, females, castrated males, males treated with an androgen receptor blocker, and castrated males/females treated with testosterone (5alpha-dihydrotestosterone or acute infusion).

Main Results:

Castration or androgen receptor blockade increased SOCS3 in male hearts post-I/R; castration also increased STAT3 activation.
Testosterone replacement (5alpha-dihydrotestosterone or acute infusion) significantly decreased myocardial STAT3/SOCS3 in castrated males and females subjected to I/R.

Conclusions:

Endogenous and exogenous testosterone decrease myocardial STAT3 activation and SOCS3 expression following I/R.
This study provides the first evidence of testosterone-downregulated STAT3/SOCS3 signaling in the myocardium.