Calcitonin Related Polypeptide Alpha Mediates Oral Cancer Pain.

Area of Science:

• Neuroscience
• Oncology
• Pain Research

Background:

• Oral cancer pain is a significant patient concern.
• Calcitonin gene related polypeptide (CGRP) is implicated in trigeminal pain and neurogenic inflammation.
• CGRP also promotes oral cancer growth.

Purpose of the Study:

• To investigate the role of CGRP in mediating oral cancer pain.
• To identify cells expressing CGRP receptor components in the oral cancer microenvironment.

Main Methods:

• Utilized CGRP-immunoreactivity to visualize neuronal innervation of oral cancer xenografts.
• Assessed the effect of CGRP antagonism on oral cancer nociception in preclinical models.
• Employed single-cell RNA-sequencing to detect CGRP receptor components (Ramp1 and Calcrl) in cancer microenvironment cells.

Main Results:

• CGRP-immunoreactive neurons and neurites innervate oral tumors.
• Cancer enhances CGRP transport in innervating axons, suggesting neurogenic secretion.
• CGRP antagonism reversed oral cancer nociception.
• Ramp1 and Calcrl transcripts were found in Schwann cells, endothelial cells, fibroblasts, and immune cells, with higher prevalence in fibroblasts and immune cells.

Conclusions:

• CGRP acts as a key mediator of oral cancer pain.
• Targeting CGRP presents a promising therapeutic avenue for alleviating oral cancer pain.