Migraine and Peripheral Pain Models Show Differential Alterations in Neuronal Complexity

Overview

Journal Headache

Publisher Wiley

Specialties Neurology
Psychiatry

Date 2022 Jun 9

PMID 35676889

Authors

Zachariah Bertels

Elizaveta Mangutov

Catherine Conway

Kendra Siegersma

Sarah Asif

Pal Shah

Nolan Huck

Vivianne L Tawfik

Amynah A Pradhan

Affiliations

Soon will be listed here.

Abstract

Objective: Our laboratory has recently shown that there is a decrease in neuronal complexity in head pain processing regions in mouse models of chronic migraine-associated pain and aura. Importantly, restoration of this neuronal complexity corresponds with anti-migraine effects of known and experimental pharmacotherapies. The objective of the current study was to expand this work and examine other brain regions involved with pain or emotional processing. We also investigated the generalizability of our findings by analyzing neuronal cytoarchitectural changes in a model of complex regional pain syndrome (CRPS), a peripheral pain disorder.

Methods: We used the nitroglycerin (NTG) model of chronic migraine-associated pain in which mice receive 10 mg/kg NTG every other day for 9 days. Cortical spreading depression (CSD), a physiological corelate of migraine aura, was evoked in anesthetized mice using KCl. CRPS was induced by tibial fracture followed by casting. Neuronal cytoarchitecture was visualized with Golgi stain and analyzed with Simple Neurite Tracer.

Results: In the NTG model, we previously showed decreased neuronal complexity in the trigeminal nucleus caudalis (TNC) and periaqueductal gray (PAG). In contrast, we found increased neuronal complexity in the thalamus and no change in the amygdala or caudate putamen in this study. Following CSD, we observed decreased neuronal complexity in the PAG, in line with decreases in the somatosensory cortex and TNC reported with this model previously. In the CRPS model there was decreased neuronal complexity in the hippocampus, as reported by others; increased complexity in the PAG; and no change within the somatosensory cortex.

Conclusions: Collectively these results demonstrate that alterations in neuronal complexity are a feature of both chronic migraine and chronic CRPS. However, each type of pain presents a unique cytoarchitectural signature, which may provide insight on how these pain states differentially transition from acute to chronic conditions.

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