Thermoneutrality induces vascular dysfunction and impaired metabolic function in male Wistar rats: a new model of vascular disease.
| Autor: | Keller AC; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado., Chun JH; Microtek, Inc., San Diego, California., Knaub LA; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado., Henckel MM; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado., Hull SE; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado., Scalzo RL; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado., Pott GB; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado., Walker LA; Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA., Reusch JEB; Division of Endocrinology, Metabolism & Diabetes, University of Colorado Anschutz Medical Campus.; Rocky Mountain Regional VA Medical Center, Aurora, Colorado. |
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| Jazyk: | angličtina |
| Zdroj: | Journal of hypertension [J Hypertens] 2022 Nov 01; Vol. 40 (11), pp. 2133-2146. Date of Electronic Publication: 2022 Sep 03. |
| DOI: | 10.1097/HJH.0000000000003153 |
| Abstrakt: | Objective: Cardiovascular disease is of paramount importance, yet there are few relevant rat models to investigate its pathology and explore potential therapeutics. Housing at thermoneutral temperature (30 °C) is being employed to humanize metabolic derangements in rodents. We hypothesized that housing rats in thermoneutral conditions would potentiate a high-fat diet, resulting in diabetes and dysmetabolism, and deleteriously impact vascular function, in comparison to traditional room temperature housing (22 °C). Methods: Male Wistar rats were housed at either room temperature or thermoneutral temperatures for 16 weeks on either a low or high-fat diet. Glucose and insulin tolerance tests were conducted at the beginning and end of the study. At the study's conclusion, vasoreactivity and mitochondrial respiration of aorta and carotid were conducted. Results: We observed diminished vasodilation in vessels from thermoneutral rats ( P < 0.05), whereas high-fat diet had no effect. This effect was also observed in endothelium-denuded aorta in thermoneutral rats ( P < 0.05). Vasoconstriction was significantly elevated in aorta of thermoneutral rats ( P < 0.05). Diminished nitric oxide synthase activity and nitrotyrosine, and elevated glutathione activity were observed in aorta from rats housed under thermoneutral conditions, indicating a climate of lower nitric oxide and excess reactive oxygen species in aorta. Thermoneutral rat aorta also demonstrated less mitochondrial respiration with lipid substrates compared with the controls ( P < 0.05). Conclusion: Our data support that thermoneutrality causes dysfunctional vasoreactivity, decreased lipid mitochondrial metabolism, and modified cellular signaling. These are critical observations as thermoneutrality is becoming prevalent for translational research models. This new model of vascular dysfunction may be useful for dissection of targetable aspects of cardiovascular disease and is a novel and necessary model of disease. (Copyright © 2022 The Author(s). Published by Wolters Kluwer Health, Inc.) |
| Databáze: | MEDLINE |
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