• Med Princ Pract · Jan 2024

    Mitochondrial Common Deletion Level in Adipose Tissue is Not Associated with Obesity but is Associated with a Structural Change in Triglycerides as Revealed by FTIR Spectroscopy.

    • Ayda Yılmaz, Nurten Bahtiyar, Ayça Doğan Mollaoğlu, Kagan Zengin, Halit Eren Taskin, Ayla Karimova, Onur Baykara, Turgut Ulutin, and Ilhan Onaran.
    • Department of Anesthesia, Vocational School of Health Services, Demiroglu Bilim University, Istanbul, Turkey.
    • Med Princ Pract. 2024 Jan 1; 33 (1): 748274-82.

    ObjectiveSeveral studies have shown that mitochondrial metabolism may be disrupted if the rate of the specific 4,977 bp deletion of mitochondrial DNA (mtDNA) reaches a threshold. This study aimed to investigate the possible associations between the mtDNA4977 deletion load and obesity-related metabolic abnormalities in the adipose tissue.MethodsThe study included thirty obese individuals, who underwent bariatric surgery, and twelve control subjects. mtDNA4977 deletion, adenine nucleotides, and lactate levels, which show the bioenergetic status were evaluated in visceral adipose tissues. Fourier transform infrared (FTIR) spectroscopy was used to investigate the structural variations and composition of adipose tissues in the context of deletion load.ResultsThere were no differences between the two groups in terms of mtDNA4977 deletion, adenine nucleotides, and lactate levels. The FTIR spectra indicated a few obesity-related alterations in adipose tissues that were not related to the mtDNA deletion load. Also, statistical analysis showed a correlation between the deletion load and a band shift of 1,744 cm-1, which assigns C = O stretching of the carbonyl group of the ester group in triglycerides and other esterified fatty acids, although it is not associated with obesity.ConclusionsOur data suggest that the mtDNA4977 deletion in visceral adipose tissues of obese individuals do not have a significant impact on the bioenergetic status. However, the increased accumulation of deletion may be associated with a specific change in the ester bond, indicating structural differences in the lipids. These findings shed light on our understanding of the tissue-specific distribution of mtDNA deletions and obesity-related adipose tissue pathogeneses.© 2023 The Author(s). Published by S. Karger AG, Basel.

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