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Liu X, Guo B, Li Q, Nie J. mTOR in metabolic homeostasis and disease. Exp Cell Res 2024; 441:114173. [PMID: 39047807 DOI: 10.1016/j.yexcr.2024.114173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 07/20/2024] [Accepted: 07/21/2024] [Indexed: 07/27/2024]
Abstract
The ability to maintain cellular metabolic homeostasis is critical to life, in which mTOR plays an important role. This kinase integrates upstream nutrient signals and performs essential functions in physiology and metabolism by increasing metabolism and suppressing autophagy. Thus, dysregulation of mTOR activity leads to diseases, especially metabolic diseases such as cancer, type 2 diabetes and neurological disorders. Therefore, inhibition of overactivated mTOR becomes a rational approach to treat a variety of metabolic diseases. In this review, we discuss how mTOR responds to upstream signals and how mTOR regulates metabolic processes, including protein, nucleic acid, and lipid metabolism. Furthermore, we discuss the possible causes and consequences of dysregulated mTOR signaling activity, and summarize relevant applications, such as inhibition of mTOR activity to treat these diseases. This review will advance our comprehensive knowledge of the association between mTOR and metabolic homeostasis, which has significant ramifications for human health.
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Affiliation(s)
- Xuejia Liu
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, China
| | - Bin Guo
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, China
| | - Qiye Li
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, China
| | - Jing Nie
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, China.
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Aljaibeji H, Heydarpour M, Stanton AM, Williams JS, Pojoga LH, Romero JR, Williams GH. Role of Raptor Gene Variants in Hypertension: Influence on Blood Pressure Independent of Salt Intake in White Population. Hypertension 2024; 81:1167-1177. [PMID: 38497230 PMCID: PMC11023780 DOI: 10.1161/hypertensionaha.123.22273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 01/29/2024] [Indexed: 03/19/2024]
Abstract
BACKGROUND The mTOR (mechanistic target of rapamycin) is an essential regulator of fundamental biological processes. mTOR forms 2 distinct complexes, mTORC1 (mTOR complex 1) when it binds with RAPTOR (Regulatory-associated Protein of mTOR) and mTORC2 (mTOR complex 2) when it associates with RICTOR (Rapamycin-insesitive companion of mTOR). Due to the previous link between the mTOR pathway, aldosterone, and blood pressure (BP), we anticipated that variants in the mTOR complex might be associated with salt-sensitive BP. METHODS BP and other parameters were assessed after a one-week liberal Na+ (200 mmol/d) and a one-week restricted Na+ (10 mmol/d) diet in 608 White subjects from the Hypertensive Pathotype cohort, single-nucleotide variants in MTOR, RPTOR, and RICTOR genes were obtained for candidate genes analyses. RESULTS The analysis revealed a significant association between a single nucleotide variants within the RPTOR gene and BP. Individuals carrying the RPTOR rs9901846 homozygous risk allele (AA) and heterozygous risk allele (GA) exhibited a 5 mm Hg increase in systolic BP on a liberal diet compared with nonrisk allele individuals (GG), but only in women. This single nucleotide variants effect was more pronounced on the restricted diet and present in both sexes, with AA carriers having a 9 mm Hg increase and GA carriers having a 5 mm Hg increase in systolic BP compared with GG. Interestingly, there were no significant associations between MTOR or RICTOR gene variants and BP. CONCLUSIONS The RPTOR gene variation is associated with elevated BP in White participants, regardless of salt intake, specifically in females.
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Affiliation(s)
- Hayat Aljaibeji
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
| | - Mahyar Heydarpour
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
| | - Ana Maria Stanton
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
| | - Jonathan S Williams
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
| | - Luminita H Pojoga
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
| | - Jose R Romero
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
| | - Gordon H Williams
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA (H.A., M.H., A.M.S., J.S.W., L.H.P., J.R.R., G.H.W.)
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Faulkner JL, Belin de Chantemèle EJ. Female Sex, a Major Risk Factor for Salt-Sensitive Hypertension. Curr Hypertens Rep 2020; 22:99. [PMID: 33089375 PMCID: PMC7675065 DOI: 10.1007/s11906-020-01113-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/12/2020] [Indexed: 02/08/2023]
Abstract
PURPOSE OF REVIEW High dietary salt is a significant contributor to essential hypertension in clinical populations. However, although clinical studies indicate a higher prevalence of salt sensitivity in women over men, knowledge of salt-sensitive mechanisms is largely restricted to males, and female-specific mechanisms are presently being elucidated. RECENT FINDINGS Male-specific mechanisms of salt-sensitive hypertension are well published and predominantly appear to involve dysfunctional renal physiology. However, emerging novel evidence indicates that aldosterone production is sex-specifically heightened in salt-sensitive hypertensive women and female rodent models, which may be regulated by intra-adrenal renin-angiotensin system activation and sex hormone receptors. In addition, new evidence that young females endogenously express higher levels of endothelial mineralocorticoid receptors (MRs) and that endothelial MR is a crucial mediator of endothelial dysfunction in females indicates that the aldosterone-endothelial MR activation pathway is a novel mediator of salt-sensitive hypertension. Heightened aldosterone levels and endothelial MR expression provide a 2-fold sex-specific mechanism that may underlie the pathology of salt-sensitive hypertension in women. This hypothesis indicates that MR antagonists may be a preferential treatment for premenopausal women diagnosed with salt-sensitive hypertension.
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Affiliation(s)
- Jessica L Faulkner
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd., Augusta, GA, 30912, USA
| | - Eric J Belin de Chantemèle
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd., Augusta, GA, 30912, USA.
- Department of Medicine (Cardiology), Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd., Augusta, GA, 30912, USA.
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Brooks DL, Garza AE, Caliskan Guzelce E, Gholami SK, Treesaranuwattana T, Maris S, Ranjit S, Tay CS, Lee JM, Romero JR, Adler GK, Pojoga LH, Williams GH. mTORC1 Deficiency Modifies Volume Homeostatic Responses to Dietary Sodium in a Sex-Specific Manner. Endocrinology 2020; 161:5802448. [PMID: 32154868 PMCID: PMC7391217 DOI: 10.1210/endocr/bqaa041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 03/06/2020] [Indexed: 12/21/2022]
Abstract
The mechanistic target of the rapamycin (mTOR) pathway plays a role in features common to both excess salt/aldosterone and cardiovascular/renal diseases. Dietary sodium can upregulate mTORC1 signaling in cardiac and renal tissue, and the inhibition of mTOR can prevent aldosterone-associated, salt-induced hypertension. The impact of sex and age on mTOR's role in volume homeostasis and the regulation of aldosterone secretion is largely unknown. We hypothesize that both age and sex modify mTOR's interaction with volume homeostatic mechanisms. The activity of 3 volume homeostatic mechanisms-cardiovascular, renal, and hormonal (aldosterone [sodium retaining] and brain natriuretic peptide [BNP; sodium losing])-were assessed in mTORC1 deficient (Raptor+/-) and wild-type male and female littermates at 2 different ages. The mice were volume stressed by being given a liberal salt (LibS) diet. Raptor+/-mice of both sexes when they aged: (1) reduced their blood pressure, (2) increased left ventricular internal diameter during diastole, (3) decreased renal blood flow, and (4) increased mineralocorticoid receptor expression. Aldosterone levels did not differ by sex in young Raptor+/- mice. However, as they aged, compared to their littermates, aldosterone decreased in males but increased in females. Finally, given the level of Na+ intake, BNP was inappropriately suppressed, but only in Raptor+/- males. These data indicate that Raptor+/- mice, when stressed with a LibS diet, display inappropriate volume homeostatic responses, particularly with aging, and the mechanisms altered, differing by sex.
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Affiliation(s)
- Danielle L Brooks
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Amanda E Garza
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Ezgi Caliskan Guzelce
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Shadi K Gholami
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | | | - Stephen Maris
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Sanjay Ranjit
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Chee Sin Tay
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Jessica M Lee
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Jose R Romero
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Gail K Adler
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Luminita H Pojoga
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
| | - Gordon H Williams
- Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Boston, MA
- Correspondence: Gordon H. Williams, MD, Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, 221 Longwood Avenue, Boston Massachusetts 02115. E-mail:
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