Unveiling ceramide dynamics: Shedding light on healthy aging in growth hormone-releasing hormone knockout mice.

Autor: Lasher AT; Department of Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA., Wang L; Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA., Hyun J; Department of Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA., Summers SA; Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA., Sun LY; Department of Biology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
Jazyk: angličtina
Zdroj: Aging cell [Aging Cell] 2024 Aug; Vol. 23 (8), pp. e14226. Date of Electronic Publication: 2024 May 29.
DOI: 10.1111/acel.14226
Abstrakt: Dysregulation of growth hormone (GH) signaling consistently leads to increased lifespan in laboratory rodents, yet the precise mechanisms driving this extension remain unclear. Understanding the molecular underpinnings of the beneficial effects associated with GH deficiency could unveil novel therapeutic targets for promoting healthy aging and longevity. In our pursuit of identifying metabolites implicated in aging, we conducted an unbiased lipidomic analysis of serum samples from growth hormone-releasing hormone knockout (GHRH-KO) female mice and their littermate controls. Employing a targeted lipidomic approach, we specifically investigated ceramide levels in GHRH-KO mice, a well-established model of enhanced longevity. While younger GHRH-KO mice did not exhibit notable differences in serum lipids, older counterparts demonstrated significant reductions in over one-third of the evaluated lipids. In employing the same analysis in liver tissue, GHRH-KO mice showed pronounced downregulation of numerous ceramides and hexosylceramides, which have been shown to elicit many of the tissue defects that accompany aging (e.g., insulin resistance, oxidative stress, and cell death). Additionally, gene expression analysis in the liver tissue of adult GHRH-KO mice identified substantial decreases in several ceramide synthesis genes, indicating that these alterations are, at least in part, attributed to GHRH-KO-induced transcriptional changes. These findings provide the first evidence of disrupted ceramide metabolism in a long-lived mammal. This study sheds light on the intricate connections between GH deficiency, ceramide levels, and the molecular mechanisms influencing lifespan extension.
(© 2024 The Author(s). Aging Cell published by Anatomical Society and John Wiley & Sons Ltd.)
Databáze: MEDLINE
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