Obesity May Connect Insulin Resistance to Decreased Neuronal Viability in Human Diabetic Brain

Suji Lee, Yoon Ji Joo, Rye Young Kim, Jaeuk Hwang, Soo Mee Lim, Sujung Yoon, Jungyoon Kim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Objective: This study aimed to investigate the relationship between insulin resistance and markers of neuronal viability and energy metabolism, as well as the additive effects of overweight or obesity, in individuals with type 2 diabetes mellitus (T2DM). Methods: Using 1H-magnetic resonance spectroscopy, prefrontal N-acetyl aspartate (NAA) and creatine levels, markers for neuronal viability and energy metabolism, respectively, were measured in 50 adults with overweight or obesity and T2DM (T2DM-O; aged 49.0 ± 7.4 years; 50% female), 50 adults with normal weight and T2DM (T2DM-N), and 50 healthy adults with normal weight (healthy-control [HC] group) matched for age and sex. The homeostatic model assessment for insulin resistance levels were calculated to assess insulin resistance. Results: Prefrontal NAA levels were lower in the T2DM-O group relative to the HC group (t = −2.51, P = 0.013). Higher insulin resistance was associated with lower prefrontal NAA levels in the T2DM-O group (t = −2.21, P = 0.032) but not in the T2DM-N group (t = −0.72, P = 0.48). Prefrontal creatine levels did not differ across the three groups. Conclusions: Overweight and obesity might contribute to T2DM-related neuronal viability deficits and could be the key links that connect insulin resistance to the decreased neuronal viability in the human diabetic brain.

Original languageEnglish
Pages (from-to)1626-1630
Number of pages5
JournalObesity
Volume28
Issue number9
DOIs
StatePublished - 1 Sep 2020

Bibliographical note

Funding Information:
This research was supported by the Brain Research Program through the National Research Foundation of Korea, funded by the Ministry of Science and Information and Communications Technology (2015M3C7A1028373, 2015M3C7A1028376), and by the Field‐oriented Support of Fire Fighting Technology Research and Development Program, funded by the National Fire Agency (Ministry of Public Safety and Security–Fire Fighting Safety [2016‐86]).

Funding Information:
Data are available on request. The authors thank all volunteers for their study participation and Sang Ah Chang, Jihyun Kim, Dong-Jun Lim, and Jung Min Lee from the Department of Internal Medicine, the Catholic University of Korea College of Medicine, for their assistance.

Publisher Copyright:
© 2020 The Obesity Society.

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