CGRP Is Critical for Hot Flushes in Ovariectomized Mice

Area of Science:

• Neuroendocrinology
• Physiology
• Pharmacology

Background:

• Hot flushes are common menopausal symptoms.
• Elevated calcitonin gene-related peptide (CGRP) is observed during hot flushes.
• The causal role of CGRP in hot flush mechanisms remains unclear.

Purpose of the Study:

• To investigate the involvement of CGRP in the mechanism of hot flushes.
• To evaluate the efficacy of CGRP antagonists in a mouse model of hot flushes.

Main Methods:

• Utilized a mouse model of hot flushes induced by physical activity in ovariectomized mice.
• Administered a non-peptide CGRP antagonist (MK-8825) to assess its effect on temperature increases.
• Examined hot flush responses in genetically modified mice lacking alpha-CGRP (αCGRP).

Main Results:

• Ovariectomized mice exhibited exaggerated flush-like temperature increases after exercise compared to controls.
• MK-8825 completely blocked these temperature increases without affecting locomotor activity.
• Mice lacking αCGRP showed significantly attenuated flush-like temperature responses.

Conclusions:

• CGRP is a key mediator in experimentally induced hot flushes.
• CGRP antagonists represent a promising therapeutic strategy for managing hot flushes in both women and men.