Klotho levels in chronic overwork stress: An animal model study

Area of Science:

• Cardiovascular Physiology
• Molecular Biology
• Pathogenesis of Overwork-Related Diseases

Background:

• Sudden death from overwork (karoshi) pathogenesis is poorly understood.
• Prolonged overwork is linked to myocardial interstitial fibrosis.
• Mechanisms connecting overwork to cardiovascular disorders require elucidation.

Purpose of the Study:

• Investigate Klotho expression in the heart and kidney of an overworked rat model.
• Hypothesize that overwork alters Klotho levels, contributing to myocardial fibrosis and cardiovascular dysfunction.
• Explore the role of Klotho in the pathophysiology of karoshi.

Main Methods:

• Established an overworked rat model using the Forced Swim Test (30 days).
• Assessed Klotho expression in myocardial, renal tissues, and serum via Western blot, immunohistochemistry, and ELISA.
• Evaluated myocardial interstitial fibrosis using Masson's staining.

Main Results:

• Significant decrease in Klotho expression in myocardial and renal tissues and serum in the overworked group.
• Overworked rats exhibited notable myocardial fibrosis; kidney fibrosis was minimal.
• Overwork was associated with reduced Klotho levels and induced myocardial fibrosis.

Conclusions:

• Overwork reduces Klotho expression and promotes myocardial fibrosis.
• Findings offer insights into the pathophysiology of karoshi and related cardiovascular diseases.
• Further research into Klotho-targeting interventions for cardiovascular protection is warranted.