Mechanisms of Hypercapnia-Induced Endoplasmic Reticulum Dysfunction.

Area of Science:

• Cellular Biology
• Physiology
• Molecular Biology

Background:

• The endoplasmic reticulum (ER) is crucial for protein synthesis, folding, and maturation, interacting with approximately one-third of cellular proteins.
• ER dysfunction is implicated in various physiological processes and diseases.
• Hypercapnia (elevated CO2) is increasingly recognized for its detrimental effects on ER function.

Purpose of the Study:

• To review the mechanisms by which acute and chronic hypercapnia impair ER function.
• To discuss the adaptive and maladaptive regulation of protein folding and maturation under elevated CO2 conditions.
• To examine the role of the unfolded protein response (UPR) in response to hypercapnia-induced ER stress.

Main Methods:

• Literature review of studies investigating ER function and hypercapnia.
• Analysis of molecular pathways involved in the unfolded protein response (UPR).
• Examination of adaptive and maladaptive cellular responses to ER stress induced by elevated CO2.

Main Results:

• Both acute and chronic hypercapnia impair ER function through distinct mechanisms.
• Elevated CO2 levels can trigger both adaptive and maladaptive unfolded protein responses (UPR).
• The UPR initially aims to restore homeostasis but can lead to maladaptive outcomes if ER stress persists.

Conclusions:

• Hypercapnia significantly impacts cellular protein homeostasis by affecting ER function.
• Understanding the UPR's role in hypercapnia is crucial for managing associated pulmonary diseases.
• Targeting ER stress pathways may offer therapeutic strategies for conditions involving hypercapnia.