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Catecholamines Induce Endoplasmic Reticulum Stress Via Both Alpha and Beta Receptors
Abdikarim Abdullahi1, Vivian Wang1, Christopher Auger2
1Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
Shock (Augusta, Ga.)
|June 25, 2019
Summary
Catecholamines, like norepinephrine, trigger endoplasmic reticulum (ER) stress in metabolic cells after severe burns. Adreno-receptor blockers can reduce this ER stress, offering a potential treatment for persistent hypermetabolism.
Area of Science:
- Biochemistry
- Cellular Biology
- Metabolic Research
Background:
- Severely burned patients exhibit persistent hypermetabolism, a condition potentially linked to elevated catecholamine levels post-injury.
- Endoplasmic reticulum (ER) stress in metabolic tissues is a recognized hallmark in burn patients, contributing to adverse effects.
Purpose of the Study:
- To investigate the role of catecholamines in inducing ER stress in metabolic tissues.
- To explore the potential of adreno-receptor blockers in mitigating catecholamine-induced ER stress.
Main Methods:
- Utilized HepG2 hepatocyte and 3T3L1 mouse adipocyte cell lines to study catecholamine effects.
- Administered norepinephrine (NE) to induce ER stress and assessed responses.
- Tested the efficacy of alpha-1 (prazosin) and beta (propranolol) blockers in preventing NE-induced ER stress.
- Examined cell type-specific responses to NE, including human fibroblasts.
Main Results:
- Norepinephrine (NE) was confirmed to induce significant ER stress in HepG2 cells and 3T3L1 adipocytes.
- Both prazosin (alpha-1 blocker) and propranolol (beta blocker) effectively blocked NE-induced ER stress.
- NE-induced ER stress was found to be cell type-specific, as human fibroblasts did not exhibit stress responses.
Conclusions:
- Catecholamines, particularly norepinephrine, directly induce endoplasmic reticulum stress in key metabolic cells.
- Adreno-receptor blockers show promise in ameliorating ER stress caused by catecholamines.
- Targeting catecholamine receptors represents a potential therapeutic strategy for ER stress-related diseases, including post-burn hypermetabolism.
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