Brain Mechanisms of Pain and Dysautonomia in Diabetic Neuropathy: Connectivity Changes in Thalamus and Hypothalamus

Chi Chao Chao, Ming Tsung Tseng, Paul Chen Hsieh, Chien Ho Janice Lin, Shin Leh Huang, Sung Tsang Hsieh, Ming Chang Chiang

Research output: Contribution to journalArticlepeer-review

Abstract

Context: About one-third of diabetic patients suffer from neuropathic pain, which is poorly responsive to analgesic therapy and associated with greater autonomic dysfunction. Previous research on diabetic neuropathy mainly links pain and autonomic dysfunction to peripheral nerve degeneration resulting from systemic metabolic disturbances, but maladaptive plasticity in the central pain and autonomic systems following peripheral nerve injury has been relatively ignored. Objective: This study aimed to investigate how the brain is affected in painful diabetic neuropathy (PDN), in terms of altered structural connectivity (SC) of the thalamus and hypothalamus that are key regions modulating nociceptive and autonomic responses. Methods: We recruited 25 PDN and 13 painless (PLDN) diabetic neuropathy patients, and 27 healthy adults as controls. The SC of the thalamus and hypothalamus with limbic regions mediating nociceptive and autonomic responses was assessed using diffusion tractography. Results: The PDN patients had significantly lower thalamic and hypothalamic SC of the right amygdala compared with the PLDN and control groups. In addition, lower thalamic SC of the insula was associated with more severe peripheral nerve degeneration, and lower hypothalamic SC of the anterior cingulate cortex was associated with greater autonomic dysfunction manifested by decreased heart rate variability. Conclusion: Our findings indicate that alterations in brain structural connectivity could be a form of maladaptive plasticity after peripheral nerve injury, and also demonstrate a pathophysiological association between disconnection of the limbic circuitry and pain and autonomic dysfunction in diabetes.

Original languageEnglish
Pages (from-to)E1167-E1180
JournalJournal of Clinical Endocrinology and Metabolism
Volume107
Issue number3
DOIs
StatePublished - 1 Mar 2022

Keywords

  • brain connectivity
  • diabetic neuropathy
  • diffusion tractography
  • hypothalamus
  • intraepidermal nerve fiber density
  • thalamus

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