Intestinal epithelial barrier function and tight junction proteins with heat and exercise

Area of Science:

• Gastroenterology
• Exercise Physiology
• Cell Biology

Background:

• The intestinal epithelial barrier, formed by enterocytes and tight junctions, regulates molecular transport.
• A compromised tight junction barrier leads to increased permeability, allowing harmful substances into circulation.
• Heat stress and exercise are conditions known to impact intestinal barrier function.

Purpose of the Study:

• To analyze the impact of exertional and nonexertional heat stress on intestinal tight junction barrier function.
• To review alterations in tight junction proteins under exercise or hyperthermic conditions.
• To discuss interventions for maintaining intestinal barrier homeostasis during heat stress or exercise.

Main Methods:

• Review of in vitro and in vivo studies (animal and human models).
• Analysis of research on tight junction protein changes.
• Examination of pharmacological and nutritional interventions.

Main Results:

• Heat stress, both exertional and passive hyperthermia, can impair intestinal tight junction barrier function.
• Exercise and heat exposure induce changes in the expression and localization of tight junction proteins.
• Specific interventions show potential in mitigating heat-induced barrier dysfunction.

Conclusions:

• Heat stress significantly affects intestinal tight junction integrity and barrier function.
• Understanding protein alterations is key to developing targeted interventions.
• Pharmacological and nutritional strategies may preserve gut barrier homeostasis during heat stress and exercise.