Exploring Tumour Neo-Innervation and Anti-Tumour Immunity with Dr. Talbot

Title: "Exploring Tumour Neo-Innervation and Anti-Tumour Immunity with Dr. Talbot"Description:The innervation of solid tumors by pain-initiating sensory neurons or nociceptors and its implications on cancer immunosurveillance is a subject of immense interest. In this episode, we're joined by Dr. Talbot, who discusses how melanoma cells interact with nociceptors, leading to their increased neurite outgrowth, sensitivity to noxious ligands, and neuropeptide release. Dr. Talbot delves into how Calcitonin Gene-Related Peptide (CGRP), a nociceptor-produced neuropeptide, can directly amplify the exhaustion of cytotoxic CD8+ T cells, limiting their ability to eliminate melanoma. Strategies like the genetic ablation of the TRPV1 lineage, local pharmacological silencing of nociceptors, and antagonism of the CGRP receptor RAMP1 all showed promising results in reducing leukocyte exhaustion and tumor growth, significantly increasing the survival rate of melanoma-bearing mice.Further, the conversation shifts to a critical finding: the reversal of CD8+ T cell exhaustion in sensory-neuron-depleted mice treated with local recombinant CGRP. Single-cell RNA sequencing of biopsies from melanoma patients further reveals the link between RAMP1-expressing CD8+ T cells and exhaustion, with RAMP1 overexpression correlating to a poorer prognosis. Join us as Dr. Talbot proposes a novel approach to improve anti-tumour immunity: curtailing the release of CGRP from tumor-innervating nociceptors to negate the immunomodulatory effects on cytotoxic CD8+ T cells.Key Words: Solid Tumours, Nociceptor Neurons, Cancer Immunosurveillance, Melanoma, Calcitonin Gene-Related Peptide (CGRP), CD8+ T Cells, TRPV1 Lineage, RAMP1, Anti-Tumour Immunity.Balood, M., Ahmadi, M., Eichwald, T. et al. Nociceptor neurons affect cancer immunosurveillance. Nature 611, 405–412 (2022). https://doi.org/10.1038/s41586-022-05374-w