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Grossmann M, Wittert GA. Testosterone in prevention and treatment of type 2 diabetes in men: Focus on recent randomized controlled trials. Ann N Y Acad Sci 2024. [PMID: 39039746 DOI: 10.1111/nyas.15188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
In epidemiological studies, lowered serum testosterone concentrations are common in men with obesity, prediabetes, and established type 2 diabetes (T2D). In men with prediabetes, lowered serum testosterone also predicts a future risk of T2D in men. Administration of testosterone consistently reduces fat mass and increases skeletal muscle mass-body compositional changes expected to be metabolically favorable. In men with established T2D, the effects of testosterone treatment on glycemic measures are inconsistent. Irrespective of baseline serum testosterone concentration in men with prediabetes or newly diagnosed early-onset T2D, testosterone treatment prescribed in conjunction with a lifestyle program has been reported to reduce the risk of T2D by 40% after 2 years, suggesting that either a lifestyle program is required to facilitate the glycemic benefit of testosterone treatment and/or that testosterone treatment has more favorable effects on glycemia in men early in the evolution or onset of the disease. The durability of the benefit and longer-term safety of testosterone treatment have not been established. Therefore, more studies are required before testosterone treatment can be recommended for the prevention and/or treatment of men with or at elevated risk of T2D who do not have hypogonadism due to an established disease of the hypothalamic-pituitary-testicular axis.
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Affiliation(s)
- Mathis Grossmann
- Department of Medicine, Austin Health, The University of Melbourne, Melbourne, Victoria, Australia
- Department of Endocrinology, Austin Health, Heidelberg, Victoria, Australia
| | - Gary A Wittert
- Freemasons Centre for Male Health and Well-being, South Australia Health and Medical Research Centre, University of Adelaide, Adelaide, South Australia, Australia
- Endocrine Unit, Royal Adelaide Hospital, Parkville, Victoria, Australia
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Xiong L, Dorus S, Ramalingam L. Role of Fish Oil in Preventing Paternal Obesity and Improving Offspring Skeletal Muscle Health. Biomedicines 2023; 11:3120. [PMID: 38137341 PMCID: PMC10740802 DOI: 10.3390/biomedicines11123120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/14/2023] [Accepted: 11/15/2023] [Indexed: 12/24/2023] Open
Abstract
This study investigates the effects of fish oil supplementation during the periconceptional period in male mice. Specifically, it examines the impact of fish oil on intergenerational health, as determined by skeletal muscle markers. To mimic paternal obesity, thirty mice were separated into three groups with distinct dietary regimes for 10 weeks: a high-fat diet (HF), a high-fat diet supplemented with fish oil (FO), and a low-fat diet (LF). Then, these mice mated with control female mice. Dams and offspring consumed a chow diet during gestation and lactation, and the offspring continued on a chow diet. To study short-term (8 weeks) and long-term (16 weeks) effects of FO, skeletal muscle was isolated at the time of sacrifice, and gene analyses were performed. Results suggest that offspring born to FO-supplemented sires exhibited a significant, short-term upregulation of genes associated with insulin signaling, fatty acid oxidation, and skeletal muscle growth with significant downregulation of genes involved in fatty acid synthesis at 8 weeks. Prominent differences in the above markers were observed at 8 weeks compared to 16 weeks. These findings suggest the potential benefits of FO supplementation for fathers during the periconceptional period in reducing the health risks of offspring due to paternal obesity.
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Affiliation(s)
- Ligeng Xiong
- Department of Nutrition and Food Studies, Syracuse University, Syracuse, NY 13244, USA
| | - Stephen Dorus
- Department of Biology, Syracuse University, Syracuse, NY 13244, USA
| | - Latha Ramalingam
- Department of Nutrition and Food Studies, Syracuse University, Syracuse, NY 13244, USA
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Inada A, Fukatsu A. Persistence and expansion of hypoxia detected by pimonidazole adduct immunostaining during progression of diabetic nephropathy in diabetic mice. Am J Physiol Renal Physiol 2023; 325:F527-F535. [PMID: 37615048 DOI: 10.1152/ajprenal.00160.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/25/2023] [Accepted: 08/17/2023] [Indexed: 08/25/2023] Open
Abstract
Hypoxia and oxidative stress are considered to be underlying factors in the deterioration of renal function and pathogenesis in acute kidney injury (AKI) and chronic kidney disease, including diabetic nephropathy (DN). However, the long-term role of hypoxia in DN is unknown. Here, we investigated the distribution, severity, and time course of hypoxia during DN development in our well-established severely diabetic transgenic (Tg) DN mouse model that mimics human DN up to 80 wk of age, using pimonidazole adduct immunohistochemistry. The relationship between pimonidazole adduct distribution and hypoxia-inducible factor (HIF) expression was also examined. We found 1) persistent pimonidazole immunostaining mainly in the outer zone of the outer medulla, extending into the inner zone, 2) significant expansion of area and intensity up to 40 wk of age, and 3) characteristic subcellular localization mainly at apical sites in vesicular form by laser scanning microscopy of thin slices. The distribution of pimonidazole adducts was different from that of HIF reported previously, indicating that hypoxia does not directly contribute to persistent abnormal HIF expression. These results suggest that pimonidazole adducts produced under low [Formula: see text] conditions are sustained by a mechanism distinct from direct ischemia. We propose that in the long course of DN development, persistent hyperfiltration and hyperexcretion of glucose, albumin, and water increase metabolism and energy expenditure in the tubules, and such chronic stimulation leads to relative ischemia and local hypoxia, which may contribute in part to the loss of nephrons.NEW & NOTEWORTHY This study provides new insights into hypoxia during the long course of diabetic nephropathy development. Hypoxia was persistently localized only in limited areas and its distribution differed significantly from that of hypoxia-inducible factors. These findings suggests that in the long course of diabetic nephropathy development, increased energy requirements and limited blood supply may lead to relative ischemia and induction of local and persistent hypoxia, which may contribute in part to the loss of nephrons.
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Affiliation(s)
- Akari Inada
- Clinical Research Department, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Kobe, Japan
- Diabetes and Genes, Advanced Medical Initiatives, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Meng Y, Thornburg LL, Hoeger KM, Núñez ZR, Kautz A, Evans AT, Wang C, Miller RK, Groth SW, O’Connor TG, Barrett ES. Association between sex steroid hormones and subsequent hyperglycemia during pregnancy. Front Endocrinol (Lausanne) 2023; 14:1213402. [PMID: 37766683 PMCID: PMC10520461 DOI: 10.3389/fendo.2023.1213402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 08/08/2023] [Indexed: 09/29/2023] Open
Abstract
Objective Sex steroid hormones may play a role in insulin resistance and glucose dysregulation. However, evidence regarding associations between early-pregnancy sex steroid hormones and hyperglycemia during pregnancy is limited. The primary objective of this study was to assess the relationships between first trimester sex steroid hormones and the subsequent development of hyperglycemia during pregnancy; with secondary evaluation of sex steroid hormones levels in mid-late pregnancy, concurrent with and subsequent to diagnosis of gestational diabetes. Methods Retrospective analysis of a prospective pregnancy cohort study was conducted. Medically low-risk participants with no known major endocrine disorders were recruited in the first trimester of pregnancy (n=319). Sex steroid hormones in each trimester, including total testosterone, free testosterone, estrone, estradiol, and estriol, were assessed using high-performance liquid chromatography and tandem mass spectrometry. Glucose levels of the 1-hour oral glucose tolerance test and gestational diabetes diagnosis were abstracted from medical records. Multivariable linear regression models were fitted to assess the associations of individual first trimester sex steroids and glucose levels. Results In adjusted models, first trimester total testosterone (β=5.24, 95% CI: 0.01, 10.46, p=0.05) and free testosterone (β=5.98, 95% CI: 0.97, 10.98, p=0.02) were positively associated with subsequent glucose concentrations and gestational diabetes diagnosis (total testosterone: OR=3.63, 95% CI: 1.50, 8.78; free testosterone: OR=3.69; 95% CI: 1.56, 8.73). First trimester estrone was also positively associated with gestational diabetes (OR=3.66, 95% CI: 1.56, 8.55). In mid-late pregnancy, pregnant people with gestational diabetes had lower total testosterone levels (β=-0.19, 95% CI: -0.36, -0.02) after adjustment for first trimester total testosterone. Conclusion Early-pregnancy sex steroid hormones, including total testosterone, free testosterone, and estrone, were positively associated with glucose levels and gestational diabetes in mid-late pregnancy. These hormones may serve as early predictors of gestational diabetes in combination with other risk factors.
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Affiliation(s)
- Ying Meng
- School of Nursing, University of Rochester, Rochester, NY, United States
| | - Loralei L. Thornburg
- Obstetrics and Gynecology, University of Rochester Medical Center, Rochester, NY, United States
| | - Kathleen M. Hoeger
- Obstetrics and Gynecology, University of Rochester Medical Center, Rochester, NY, United States
| | - Zorimar Rivera- Núñez
- Biostatistics and Epidemiology, Rutgers School of Public Health, Piscataway, NJ, United States
- Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ, United States
| | - Amber Kautz
- Public Health Sciences, University of Rochester Medical Center, Rochester, NY, United States
| | - Adam T. Evans
- Obstetrics and Gynecology, University of Rochester Medical Center, Rochester, NY, United States
| | - Christina Wang
- Division of Endocrinology, Department of Medicine and Clinical and Translational Science Institue, The Lundquist Institute at Harbor-University of California, Los Angeles (UCLA) Medical Center, Torrance, CA, United States
| | - Richard K. Miller
- Obstetrics and Gynecology, University of Rochester Medical Center, Rochester, NY, United States
| | - Susan W. Groth
- School of Nursing, University of Rochester, Rochester, NY, United States
| | - Thomas G. O’Connor
- Obstetrics and Gynecology, University of Rochester Medical Center, Rochester, NY, United States
- Department of Psychiatry, University of Rochester, Rochester, NY, United States
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY, United States
- Wynne Center for Family Research, University of Rochester Medical Center, Rochester, NY, United States
| | - Emily S. Barrett
- Obstetrics and Gynecology, University of Rochester Medical Center, Rochester, NY, United States
- Biostatistics and Epidemiology, Rutgers School of Public Health, Piscataway, NJ, United States
- Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ, United States
- Public Health Sciences, University of Rochester Medical Center, Rochester, NY, United States
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Inada A, Yasunami Y, Yoshiki A, Nabeshima YI, Inada O. Greb1 Transiently Accelerates Pancreatic β-Cell Proliferation in Diabetic Mice Exposed to Estradiol. THE AMERICAN JOURNAL OF PATHOLOGY 2023; 193:1081-1100. [PMID: 37516458 DOI: 10.1016/j.ajpath.2023.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/14/2023] [Accepted: 04/04/2023] [Indexed: 07/31/2023]
Abstract
Decrease of pancreatic β cells leads to diabetes. In an inducible cAMP early suppressor (ICER-Iγ) transgenic mouse model of severe type 2 diabetes with reduced insulin production and depleted β cells, supplementation with high concentrations of 17β-estradiol (E2) markedly enhances β-cell proliferation and normalizes glucose levels. The current study explored the underlying mechanisms leading to a dynamic increase of β cells and pathologic changes in diabetic mice exposed to E2. Gene expression profiling of pancreatic islets of 6-month-old ICER-transgenic mice recovering from diabetes due to elevated E2 levels identified growth regulation by estrogen in breast cancer 1 (Greb1) as a gene significantly up-regulated during the recovery phase. To substantiate this, β-cell-specific Greb1-deficient mice were generated, and Greb1 was shown to be essential for recovery of depleted β cells in diabetic mice. Graft growth and glucose lowering were observed in 50 islets with increased Greb1 expression transplanted adjacent to E2 pellets beneath the kidney capsule of streptozotocin-induced diabetic mice. Greb1 expression due to a drastic increase in exogenous or endogenous E2 was transient and closely correlated with changes in E2-related and some cell cycle-related genes. These findings provide new insights into in vivo proliferation of deficient β cells and suggest the possibility of new therapeutic approaches targeting pancreatic β cells that could revolutionize the concept of diabetes treatment, which has been considered difficult to cure completely.
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Affiliation(s)
- Akari Inada
- Clinical Research Department, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Kobe, Japan; Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Kobe, Japan; Diabetes and Genes, Advanced Medical Initiatives, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
| | | | - Atsushi Yoshiki
- Experimental Animal Division, RIKEN BioResource Research Center, Tsukuba, Japan
| | - Yo-Ichi Nabeshima
- Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, Kobe, Japan
| | - Oogi Inada
- Diabetes and Genes, Advanced Medical Initiatives, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Hughes FM, Allkanjari A, Odom MR, Mulcrone JE, Jin H, Purves JT. Male Akita mice develop signs of bladder underactivity independent of NLRP3 as a result of a decrease in neurotransmitter release from efferent neurons. Am J Physiol Renal Physiol 2023; 325:F61-F72. [PMID: 37167271 PMCID: PMC10292983 DOI: 10.1152/ajprenal.00284.2022] [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: 11/21/2022] [Revised: 04/26/2023] [Accepted: 05/08/2023] [Indexed: 05/13/2023] Open
Abstract
Diabetic bladder dysfunction (DBD) is a prevalent diabetic complication that is recalcitrant to glucose control. Using the Akita mouse model (type 1) bred to be NLR family pyrin domain containing 3 (NLRP3)+/+ or NLRP3-/-, we have previously found that females (mild hyperglycemia) progress from an overactive to underactive bladder phenotype and that this progression was dependent on NLRP3-induced inflammation. Here, we examined DBD in the male Akita mouse (severe hyperglycemia) and found by urodynamics only a compensated underactive-like phenotype (increased void volume and decreased frequency but unchanged efficiency). Surprisingly, this phenotype was still present in the NLRP3-/- strain and so was not dependent on NLRP3 inflammasome-induced inflammation. To examine the cause of the compensated underactive-like phenotype, we assessed overall nerve bundle density and afferent nerve bundles (Aδ-fibers). Both were decreased in density during diabetes, but denervation was absent in the diabetic NLRP3-/- strain so it was deemed unlikely to cause the underactive-like symptoms. Changes in bladder smooth muscle contractility to cell depolarization and receptor activation were also not responsible as KCl (depolarizing agent), carbachol (muscarinic agonist), and α,β-methylene-ATP (purinergic agonist) elicited equivalent contractions in denuded bladder strips in all groups. However, electrical field stimulation revealed a diabetes-induced decrease in contractility that was not blocked in the NLRP3-/- strain, suggesting that the bladder compensated underactive-like phenotype in the male Akita mouse is likely through a decrease in efferent neurotransmitter release.NEW & NOTEWORTHY In this study, we show that diabetic bladder dysfunction (the most common diabetic complication) manifests through different mechanisms that may be related to severity of hyperglycemia and/or sex. Male Akita mice, which have severe hyperglycemia, develop bladder underactivity as a result of a decrease in efferent neurotransmitter release that is independent of inflammation. This contrasts with females, who have milder hyperglycemia, where diabetic bladder dysfunction progresses from overactivity to underactivity in an inflammation-dependent manner.
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Affiliation(s)
- Francis M Hughes
- Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States
| | - Armand Allkanjari
- Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States
| | - Michael R Odom
- Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States
| | - Jack E Mulcrone
- Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States
| | - Huixia Jin
- Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States
| | - J Todd Purves
- Division of Urology, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States
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Inada A, Inada O. Differences in long-term effects of standard rodent diets on blood glucose and body weight of offspring. Diabetol Int 2022; 13:615-623. [PMID: 36117929 PMCID: PMC9477981 DOI: 10.1007/s13340-022-00578-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/10/2022] [Indexed: 01/03/2023]
Abstract
Standard rodent diets are similar and contain well-balanced components, such as crude protein, fat, fiber, and ash. However, it is not clear whether there are differences in their long-term effects on metabolism. Here, we investigated the effects of long-term feeding of major standard diets, CRF-1, CE-2, and FR-1 to wild-type (WT) C57BL/6 mice on the blood glucose levels and body weight gain of their offspring, which were raised on the same diet and in the same environment as the mothers. The offspring have been influenced by the maternal diet during the fetal and neonatal stages, and were maintained on the same diet thereafter (until 60 weeks of age). In the CE-2 group, the offspring showed stable blood glucose levels and had the lowest body weight. The FR1 group showed the lowest blood glucose level, but body weight was increased significantly compared to the CE-2 group. In the CRF-1 group, higher blood glucose levels were seen from the neonatal stage and body weight increased more rapidly than in the other groups. Next, to determine the effects of blood glucose level and housing pattern on food and water consumption, severely diabetic (hyperglycemic) inducible cAMP early repressor (ICER) transgenic (Tg) mice and littermate WT mice (normoglycemic) were fed CE-2 diet and housed individually or in groups. Food and water consumption of WT mice was independent of housing pattern, whereas Tg mice showed significantly increased food and water consumption when housed individually, compared to group housing, and this did not change at different ages. Thus, the selection of standard diet and rearing method can have a marked impact on experimental outcomes in experiments using mice and presumably mouse cells, especially in studies of metabolism, diabetes, and obesity.
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Affiliation(s)
- Akari Inada
- grid.177174.30000 0001 2242 4849Diabetes and Genes, Advanced Medical Initiatives, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
- grid.417982.10000 0004 0623 246XPresent Address: Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation (IBRI), 6-3-7 Minatojima Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047 Japan
| | - Oogi Inada
- grid.177174.30000 0001 2242 4849Diabetes and Genes, Advanced Medical Initiatives, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Wander PL, Enquobahrie DA, Bammler TK, MacDonald JW, Srinouanprachanh S, Kaleru T, Khakpour D, Trikudanathan S. Associations of plasma miRNAs with waist circumference and insulin resistance among women with polycystic ovary syndrome - Pilot study. Mol Cell Endocrinol 2022; 554:111723. [PMID: 35843386 PMCID: PMC9552972 DOI: 10.1016/j.mce.2022.111723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/08/2022] [Accepted: 07/11/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND Insulin resistance (IR) and central obesity are common in polycystic ovary syndrome (PCOS), but pathomechanisms for IR in PCOS are not established. Circulating microRNAs (miRNAs) are non-invasive biomarkers of epigenetic regulation that may contribute to the pathogenesis of IR and central adiposity in PCOS. METHODS We conducted a pilot study to examine associations of circulating miRNAs with IR and central adiposity among women with PCOS (n = 11) using high-throughput miRNA sequencing. We fit generalized linear models examining associations of waist circumference and HOMA-IR with plasma miRNAs. We used false discovery rate (FDR)-adjusted cutoff p < 0.1 to correct for multiple testing. We used miRDB's Gene Ontology (GO) tool to identify predicted pathways for top hits. RESULTS Mean age and BMI of participants were 27.9 years and 32.5 kg/m2, respectively. Lower levels of miR-1294 were associated with higher waist circumference (β = -0.10, FDR = 0.095). While no miRNAs were associated with HOMA-IR at our FDR cut off <0.1, 11 miRNAs were associated with waist circumference and 14 miRNAs with HOMA-IR at unadjusted p < 0.01, including members of the highly conserved miR-17/92 cluster and miR-1294 (β = -0.10, p < 0.001). The GO analysis of miR-1294 identified 54 overrepresented pathways, including "negative regulation of insulin receptor signaling" (FDR = 0.019), and 6 underrepresented pathways. CONCLUSIONS Plasma miR-1294 along with members of the miR-17/92 cluster and miRNAs involved in insulin signaling may be associated with central obesity and insulin resistance in PCOS. Larger studies among women with and without PCOS are needed to validate these findings.
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Affiliation(s)
- Pandora L Wander
- Veterans Affairs Puget Sound Health Care System, Seattle, WA, United States; Division of General Internal Medicine, University of Washington, Seattle, WA, United States.
| | - Daniel A Enquobahrie
- Department of Epidemiology, University of Washington, Seattle, WA, United States
| | - Theo K Bammler
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, United States
| | - James W MacDonald
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, United States
| | - Sengkeo Srinouanprachanh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, United States
| | - Thanmai Kaleru
- Division of Metabolism, Endocrinology, and Nutrition, University of Washington, Seattle, WA, United States
| | - Dori Khakpour
- Division of Metabolism, Endocrinology, and Nutrition, University of Washington, Seattle, WA, United States
| | - Subbulaxmi Trikudanathan
- Division of Metabolism, Endocrinology, and Nutrition, University of Washington, Seattle, WA, United States
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Inada A, Inada O, Yasunami Y, Arakawa K, Nabeshima YI, Fukatsu A. Amelioration of Murine Diabetic Nephropathy with a SGLT2 Inhibitor Is Associated with Suppressing Abnormal Expression of Hypoxia-Inducible Factors. THE AMERICAN JOURNAL OF PATHOLOGY 2022; 192:1028-1052. [PMID: 35460614 DOI: 10.1016/j.ajpath.2022.03.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 03/27/2022] [Accepted: 03/31/2022] [Indexed: 06/14/2023]
Abstract
Diabetic nephropathy (DN), once manifested, is unlikely to completely recover. Factors that influence DN progression were explored by investigating the process of glomerulosclerosis and interstitial fibrosis and chronological changes in glucose, albuminuria, hyperfiltration, and expressions of sodium-glucose cotransporter 2 (SGLT2) and hypoxia-inducible factors (HIFs) up to 50 weeks in inducible cAMP early repressor transgenic mice, a model of severe DN. Long-term intervention with the SGLT2 inhibitor canagliflozin or islet transplantation or heminephrectomy was used. Inducible cAMP early repressor transgenic mice exhibited progressive diabetic glomerulosclerosis and mild interstitial fibrosis, and expressed extensive HIF-1α and HIF-2α in glomerulus and tubules, with sustained hyperfiltration up to 50 weeks. Canagliflozin ameliorated glomerulosclerosis/interstitial fibrosis gradually and reduced HIF overexpression. Islet-transplanted mice exhibited no amelioration. None of the heminephrectomized diabetic mice survived the hyperfiltration overload, but all of the canagliflozin-treated mice survived with re-expressions of HIF-1α and HIF-2α. These results suggest that persistent glomerular hyperfiltration might initiate glomerular injury, and persistent overexpression of HIFs could promote the development of glomerulosclerosis and interstitial fibrosis. Canagliflozin attenuated both changes. Oxidative stress or hypoxia was undetectable in this model. The abnormal expression of HIF-1α and HIF-2α may be a potential therapeutic target for preventing glomerulosclerosis and interstitial fibrosis.
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Affiliation(s)
- Akari Inada
- Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation (IBRI), Kobe, Japan; Clinical Research Department, Institute of Biomedical Research and Innovation (IBRI), Kobe, Japan.
| | - Oogi Inada
- Diabetes and Genes, Advanced Medical Initiatives, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | | | - Kenji Arakawa
- Medical Intelligence Department, Ikuyaku, Integrated Value Development Division, Tanabe Mitsubishi Pharma Corporation, Tokyo, Japan
| | - Yo-Ichi Nabeshima
- Clinical Research Department, Institute of Biomedical Research and Innovation (IBRI), Kobe, Japan
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Effects of Moderate-Intensity Physical Training on Skeletal Muscle Substrate Transporters and Metabolic Parameters of Ovariectomized Rats. Metabolites 2022; 12:metabo12050402. [PMID: 35629906 PMCID: PMC9145860 DOI: 10.3390/metabo12050402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 04/13/2022] [Accepted: 04/20/2022] [Indexed: 11/20/2022] Open
Abstract
A deficit of estrogen is associated with energy substrate imbalance, raising the risk of metabolic diseases. Physical training (PT) is a potent metabolic regulator through oxidation and storage of substrates transported by GLUT4 and FAT CD36 in skeletal muscle. However, little is known about the effects of PT on these carriers in an estrogen-deficit scenario. Thus, the aim of this study was to determine the influence of 12 weeks of PT on metabolic variables and GLUT4 and FAT CD36 expression in the skeletal muscle of animals energetically impaired by ovariectomy (OVX). The trained animals swam 30 min/day, 5 days/week, at 80% of the critical load intensity. Spontaneous physical activity was measured biweekly. After training, FAT CD36 and GLUT4 expressions were quantified by immunofluorescence in the soleus, as well as muscular glycogen and triglyceride of the soleus, gluteus maximus and gastrocnemius. OVX significantly reduced FAT CD36, GLUT4 and spontaneous physical activity (p < 0.01), while PT significantly increased FAT CD36, GLUT4 and spontaneous physical activity (p < 0.01). PT increased soleus glycogen, and OVX decreased muscular triglyceride of gluteus maximus. Therefore, OVX can cause energy disarray through reduction in GLUT4 and FAT CD36 and their muscle substrates and PT prevented these metabolic consequences, masking ovarian estrogen’s absence.
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Elsayed MM, El Refaye GE, Rabiee A, Abouzeid S, Elsisi HF. Aerobic exercise with diet induces hormonal, metabolic, and psychological changes in postmenopausal obese women. Heliyon 2022; 8:e09165. [PMID: 35368551 PMCID: PMC8971591 DOI: 10.1016/j.heliyon.2022.e09165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 03/05/2022] [Accepted: 03/18/2022] [Indexed: 11/25/2022] Open
Abstract
Physical activity and diet are recommended lifestyle strategies to improve human health. Consequently, this study aimed to investigate the impact of aerobic exercise combined with dietary restriction on hormonal, metabolic, and psychological variables in postmenopausal women. Eligible 60 women were enrolled and assigned into two equal groups; the experimental group performed aerobic exercise three times per week for 12 weeks with diet restriction, and the control group only received the same diet program. Serum levels of sex hormones, insulin resistance, and depression scores were measured before and after the intervention. Results All measured variables were significantly changed in the experimental group compared to the control group (P = 0.001). Conclusion Changes in sex hormones are a biological marker of metabolic complications such as insulin resistance, which can be reduced with exercise and diet. In addition, they are effective therapeutic interventions in the treatment of mild depression. Trial registration Registration identifier number of this study is: NCT05136742 on https://register.ClinicalTrials.gov.
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Affiliation(s)
- Marwa M Elsayed
- Department of Physical Therapy for Cardiovascular/Respiratory Disorders and Geriatrics, Faculty of Physical Therapy, Cairo University, Giza, Egypt
| | - Ghada E El Refaye
- Department of Physical Therapy for Women's Health, Faculty of Physical Therapy, Cairo University, Giza, Egypt
| | - Ahmed Rabiee
- Department of Internal Medicine, Faculty of Medicine, Cairo University, Giza, Egypt
| | - Sameh Abouzeid
- Department of Nephrology, Theodor Bilharz Research Institute, Giza, Egypt
| | - Hany F Elsisi
- Department of Physical Therapy for Cardiovascular/Respiratory Disorders and Geriatrics, Faculty of Physical Therapy, Cairo University, Giza, Egypt
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Pejon TMM, Faria VS, Gobatto CA, Manchado-Gobatto FB, Scariot PPM, Cornachione AS, Beck WR. Effect of 12-wk Training in Ovariectomised Rats on PGC-1α, NRF-1 and Energy Substrates. Int J Sports Med 2022; 43:632-641. [PMID: 35180801 DOI: 10.1055/a-1717-1693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Metabolic diseases are associated with hypoestrogenism owing to their lower energy expenditure and consequent imbalance. Physical training promotes energy expenditure through PGC-1α and NRF-1, which are muscle proteins of the oxidative metabolism. However, the influence of physical training on protein expression in individuals with hypoestrogenism remains uncertain. Thus, the aim of this study is to determine the effect of 12 weeks of moderate-intensity swimming training on the muscle expression of PGC-1α, NRF-1, glycogen and triglyceride in ovariectomised rats. OVX and OVX+TR rats were subjected to ovariectomy. The trained animals swam for 30 minutes, 5 days/week, at 80% of the critical load intensity. Soleus was collected to quantify PGC-1α and NRF-1 expressions, while gastrocnemius and gluteus maximus were collected to measure glycogen and triglyceride. Blood glucose was also evaluated. Whereas ovariectomy decreased PGC-1α expression (p<0.05) without altering NRF-1 (p=0.48), physical training increased PGC-1α (p<0.01) and NRF-1 (p<0.05). Ovariectomy reduced glycogen (p<0.05) and triglyceride (p<0.05), whereas physical training increased glycogen (p<0.05) but did not change triglyceride (p=0.06). Ovariectomy increased blood glucose (p<0.01), while physical training reduced it (p<0.01). In summary, 12 weeks of individualized and moderate-intensity training were capable of preventing muscle metabolic consequences caused by ovariectomy.
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Affiliation(s)
- Taciane Maria Melges Pejon
- Laboratory of Endocrine Physiology and Physical Exercise, Department of Physiological Sciences, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Vinicius Silva Faria
- Laboratory of Endocrine Physiology and Physical Exercise, Department of Physiological Sciences, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Claudio Alexandre Gobatto
- Laboratory of Applied Sport Physiology, Department of Sport Sciences, School of Applied Sciences, State University of Campinas, Limeira, São Paulo, Brazil
| | - Fúlvia Barros Manchado-Gobatto
- Laboratory of Applied Sport Physiology, Department of Sport Sciences, School of Applied Sciences, State University of Campinas, Limeira, São Paulo, Brazil
| | - Pedro Paulo Menezes Scariot
- Laboratory of Applied Sport Physiology, Department of Sport Sciences, School of Applied Sciences, State University of Campinas, Limeira, São Paulo, Brazil
| | - Anabelle Silva Cornachione
- Muscle Physiology and Biophysics Laboratory, Department of Physiological Sciences, Federal University of São Carlos, São Carlos, São Paulo, Brazil
| | - Wladimir Rafael Beck
- Muscle Physiology and Biophysics Laboratory, Department of Physiological Sciences, Federal University of São Carlos, São Carlos, São Paulo, Brazil
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Tuorila K, Ollila MM, Järvelin MR, Tapanainen JS, Franks S, Puukka K, Piltonen TT, Morin-Papunen L. Hyperandrogenemia in Early Adulthood Is an Independent Risk Factor for Abnormal Glucose Metabolism in Middle Age. J Clin Endocrinol Metab 2021; 106:e4621-e4633. [PMID: 34153097 PMCID: PMC8530724 DOI: 10.1210/clinem/dgab456] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Indexed: 11/19/2022]
Abstract
CONTEXT The role of androgen excess as a contributing factor to abnormal glucose metabolism (AGM) and insulin resistance in women remains controversial. OBJECTIVE To investigate whether hyperandrogenemia (HA) estimated by serum testosterone (T) level and free androgen index (FAI) at ages 31 and 46 years is associated with insulin resistance, insulin secretion and AGM by age 46. DESIGN Prospective study including 5889 females followed at ages 31 and 46 years. SETTING General community. PARTICIPANTS Women with HA were compared with normoandrogenic women at ages 31 and 46 years. INTERVENTION None. MAIN OUTCOME MEASUREMENTS AGM, including prediabetes and type 2 diabetes mellitus, homeostatic model assessments of insulin resistance (HOMA-IR) and of pancreatic β-cell function (HOMA-B). RESULTS At age 31 years, HA women displayed increased HOMA-IR (P = 0.002), HOMA-B (P = 0.007), and higher fasting insulin (P = 0.03) than normoandrogenic women after adjusting for body mass index (BMI). At age 46 years, there was a nonsignificant trend toward higher fasting glucose (P = 0.07) and glycated hemoglobin A1 (P = 0.07) levels in HA women. Women in the highest T quartile (odds ratio [OR] = 1.80; 95%CI, 1.15-2.82) at age 31 years and in the 2 highest FAI quartiles at ages 31 (Q4: OR = 3.76; 95% CI, 2.24-6.32) and 46 (Q4: OR = 2.79; 95% CI, 1.74-4.46) years had increased risk for AGM, independently of BMI, when compared with women in Q1. SHBG was inversely associated with AGM (at age 31 years: Q4: OR = 0.37; 95% CI, 0.23-0.60, at age 46 years: Q4: OR = 0.28; 95% CI, 0.17-0.44). CONCLUSION Hyperandrogenemia and low SHBG in early and middle age associates with AGM independently of BMI.
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Affiliation(s)
- Katri Tuorila
- Department of Obstetrics and Gynecology, University of Oulu and Oulu University Hospital, Medical Research Center, PEDEGO Research Unit, Oulu, Finland
| | - Meri-Maija Ollila
- Department of Obstetrics and Gynecology, University of Oulu and Oulu University Hospital, Medical Research Center, PEDEGO Research Unit, Oulu, Finland
| | - Marjo-Riitta Järvelin
- MRC-PHE Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, UK
- Center for Life Course Health Research, Faculty of Medicine, University of Oulu, Oulu, Finland
- Unit of Primary Health Care, Oulu University Hospital, OYS, Oulu, Finland
- Department of Life Sciences, College of Health and Life Sciences, Brunel University London, London, UK
| | - Juha S Tapanainen
- Department of Obstetrics and Gynecology, University of Oulu and Oulu University Hospital, Medical Research Center, PEDEGO Research Unit, Oulu, Finland
- Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Stephen Franks
- Institute of Reproductive and Developmental Biology, Imperial College London, London, UK
| | - Katri Puukka
- NordLab Oulu, Department of Clinical Chemistry, University of Oulu and Oulu University Hospital, Medical Research Center Oulu, Oulu, Finland
| | - Terhi T Piltonen
- Department of Obstetrics and Gynecology, University of Oulu and Oulu University Hospital, Medical Research Center, PEDEGO Research Unit, Oulu, Finland
| | - Laure Morin-Papunen
- Department of Obstetrics and Gynecology, University of Oulu and Oulu University Hospital, Medical Research Center, PEDEGO Research Unit, Oulu, Finland
- Correspondence: Laure Morin-Papunen, MD, PhD, Department of Obstetrics and Gynecology, Oulu University Hospital, PL 23 90029 OYS, Finland.
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14
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Alemany M. Estrogens and the regulation of glucose metabolism. World J Diabetes 2021; 12:1622-1654. [PMID: 34754368 PMCID: PMC8554369 DOI: 10.4239/wjd.v12.i10.1622] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/10/2021] [Accepted: 04/14/2021] [Indexed: 02/06/2023] Open
Abstract
The main estrogens: estradiol, estrone, and their acyl-esters have been studied essentially related to their classical estrogenic and pharmacologic functions. However, their main effect in the body is probably the sustained control of core energy metabolism. Estrogen nuclear and membrane receptors show an extraordinary flexibility in the modulation of metabolic responses, and largely explain gender and age differences in energy metabolism: part of these mechanisms is already sufficiently known to justify both. With regard to energy, the estrogen molecular species act essentially through four key functions: (1) Facilitation of insulin secretion and control of glucose availability; (2) Modulation of energy partition, favoring the use of lipid as the main energy substrate when more available than carbohydrates; (3) Functional protection through antioxidant mechanisms; and (4) Central effects (largely through neural modulation) on whole body energy management. Analyzing the different actions of estrone, estradiol and their acyl esters, a tentative classification based on structure/effects has been postulated. Either separately or as a group, estrogens provide a comprehensive explanation that not all their quite diverse actions are related solely to specific molecules. As a group, they constitute a powerful synergic action complex. In consequence, estrogens may be considered wardens of energy homeostasis.
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Affiliation(s)
- Marià Alemany
- Faculty of Biology, University of Barcelona, Barcelona 08028, Catalonia, Spain
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15
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Arnone AA, Cline JM, Soto-Pantoja DR, Cook KL. Investigating the role of endogenous estrogens, hormone replacement therapy, and blockade of estrogen receptor-α activity on breast metabolic signaling. Breast Cancer Res Treat 2021; 190:53-67. [PMID: 34448090 PMCID: PMC8557185 DOI: 10.1007/s10549-021-06354-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 08/06/2021] [Indexed: 12/11/2022]
Abstract
Purpose Menopause is associated with an increased risk of estrogen receptor-positive (ER +) breast cancer. To characterize the metabolic shifts associated with reduced estrogen bioavailability on breast tissue, metabolomics was performed from ovary-intact and ovariectomized (OVX) female non-human primates (NHP). The effects of exogenous estrogen administration or estrogen receptor blockade (tamoxifen treatment) on menopause-induced metabolic changes were also investigated. Methods Bilateral ovariectomies were performed on female cynomolgus macaques (Macaca fascicularis) to model menopause. OVX NHP were then divided into untreated (n = 13), conjugated equine estrogen (CEE)-treated (n= 13), or tamoxifen-treated (n = 13) subgroups and followed for 3 years. Aged-matched ovary-intact female NHP (n = 12) were used as a premenopausal comparison group. Metabolomics was performed on snap-frozen breast tissue. Results Changes in several different metabolic biochemicals were noted, particularly in glucose and fatty acid metabolism. Specifically, glycolytic, Krebs cycle, acylcarnitines, and phospholipid metabolites were elevated in breast tissue from ovary-intact NHP and OVX + CEE in relation to the OVX and OVX + tamoxifen group. In contrast, treatment with CEE and tamoxifen decreased several cholesterol metabolites, compared to the ovary-intact and OVX NHP. These changes were accompanied by elevated bile acid metabolites in the ovary-intact group. Conclusion Alterations in estrogen bioavailability are associated with changes in the mammary tissue metabolome, particularly in glucose and fatty acid metabolism. Changes in these pathways may represent a bioenergetic shift in gland metabolism at menopause that may affect breast cancer risk. Supplementary Information The online version contains supplementary material available at 10.1007/s10549-021-06354-w.
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Affiliation(s)
- Alana A Arnone
- Department of Physiology and Pharmacology, Wake Forest University Health Sciences, Winston-Salem, NC, 27157, USA.,Department of Surgery, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - J Mark Cline
- Department of Pathology, Section on Comparative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA.,Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - David R Soto-Pantoja
- Department of Surgery, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA.,Department of Cancer Biology, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA.,Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Katherine L Cook
- Department of Surgery, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA. .,Department of Cancer Biology, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA. .,Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA.
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16
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Aromatase deficiency in hematopoietic cells improves glucose tolerance in male mice through skeletal muscle-specific effects. PLoS One 2020; 15:e0227830. [PMID: 31971970 PMCID: PMC6977739 DOI: 10.1371/journal.pone.0227830] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/30/2019] [Indexed: 12/14/2022] Open
Abstract
Estrogens are important for maintaining metabolic health in males. However, the key sources of local estrogen production for regulating energy metabolism have not been fully defined. Immune cells exhibit aromatase activity and are resident in metabolic tissues. To determine the relative contribution of immune cell-derived estrogens for metabolic health in males, C57BL6/J mice underwent bone marrow transplant with marrow from either wild-type (WT(WT)) or aromatase-deficient (WT(ArKO)) donors. Body weight, body composition, and glucose and insulin tolerance were assessed over 24 weeks with mice maintained on a regular chow diet. No differences were found in insulin sensitivity between groups, but WT(ArKO) mice were more glucose tolerant than WT(WT) mice 20 weeks after transplant, suggestive of enhanced glucose disposal (AUCglucose 6061±3349 in WT(WT) mice versus 3406±1367 in WT(ArKO) mice, p = 0.01). Consistent with this, skeletal muscle from WT(ArKO) mice showed higher expression of the mitochondrial genes Ppargc1a (p = 0.03) and Nrf1 (p = 0.01), as well as glucose transporter type 4 (GLUT4, Scl2a4; p = 0.02). Skeletal muscle from WT(ArKO) mice had a lower concentration of 17β-estradiol (5489±2189 pg/gm in WT(WT) mice versus 3836±2160 pg/gm in WT(ArKO) mice, p = 0.08) but higher expression of estrogen receptor-α (ERα, Esr1), raising the possibility that aromatase deficiency in immune cells led to a compensatory increase in ERα signaling. No differences between groups were found with regard to body weight, adiposity, or gene expression within adipose tissue or liver. Immune cells are a key source of local 17β-estradiol production and contribute to metabolic regulation in males, particularly within skeletal muscle. The respective intracrine and paracrine roles of immune cell-derived estrogens require further delineation, as do the pathways that regulate aromatase activity in immune cells specifically within metabolic tissues.
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17
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Antinozzi C, Marampon F, Sgrò P, Tombolini V, Lenzi A, Crescioli C, Di Luigi L. Comparative study of testosterone and vitamin D analogue, elocalcitol, on insulin-controlled signal transduction pathway regulation in human skeletal muscle cells. J Endocrinol Invest 2019; 42:897-907. [PMID: 30600434 DOI: 10.1007/s40618-018-0998-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 12/21/2018] [Indexed: 12/19/2022]
Abstract
PURPOSE Skeletal muscle (Skm) plays a key role in regulating energetic metabolism through glucose homeostasis. Several hormones such as Testosterone (T) and Vitamin D (VD) have been shown to affect energy-dependent cell trafficking by determining Insulin (I)-like effects. AIM To elucidate possible hormone-related differences on muscular metabolic control, we analyzed and compared the effects of T and elocalcitol (elo), a VD analogue, on the activation of energy-dependent cell trafficking, metabolism-related-signal transduction pathways and transcription of gene downstream targets. METHODS Human fetal skeletal muscle cells (Hfsmc) treated with T or elo were analyzed for GLUT4 localization, phosphorylation/activation status of AKT, ERK1/2, IRS-1 signaling and c-MYC protein expression. RESULTS T, similar to elo, induced GLUT4 protein translocation likely in lipid raft microdomains. While both T and elo induced a rapid IRS-1 phosphorylation, the following dynamic in phosphorylation/activation of AKT and ERK1/2 signaling was different. Moreover, T but not elo increased c-MYC protein expression. CONCLUSIONS All together, our evidence indicates that whether both T and elo are able to affect upstream I-like pathway, they differently determine downstream effects in I-dependent cascade, suggesting diverse physiological roles in mediating I-like response in human skeletal muscle.
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Affiliation(s)
- C Antinozzi
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", 00135, Rome, Italy
| | - F Marampon
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", 00135, Rome, Italy
- Department of Radiotherapy, Sapienza University of Rome, Rome, Italy
| | - P Sgrò
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", 00135, Rome, Italy
| | - V Tombolini
- Department of Radiotherapy, Sapienza University of Rome, Rome, Italy
| | - A Lenzi
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - C Crescioli
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", 00135, Rome, Italy.
| | - L Di Luigi
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", 00135, Rome, Italy
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18
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Santen RJ, Simpson E. History of Estrogen: Its Purification, Structure, Synthesis, Biologic Actions, and Clinical Implications. Endocrinology 2019; 160:605-625. [PMID: 30566601 DOI: 10.1210/en.2018-00529] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 07/20/2018] [Indexed: 12/31/2022]
Abstract
This mini-review summarizes key points from the Clark Sawin Memorial Lecture on the History of Estrogen delivered at Endo 2018 and focuses on the rationales and motivation leading to various discoveries and their clinical applications. During the classical period of antiquity, incisive clinical observations uncovered important findings; however, extensive anatomical dissections to solidify proof were generally lacking. Initiation of the experimental approach followed later, influenced by Claude Bernard's treatise "An Introduction to the Study of Experimental Medicine." With this approach, investigators began to explore the function of the ovaries and their "internal secretions" and, after intensive investigations for several years, purified various estrogens. Clinical therapies for hot flashes, osteoporosis, and dysmenorrhea were quickly developed and, later, methods of hormonal contraception. Sophisticated biochemical methods revealed the mechanisms of estrogen synthesis through the enzyme aromatase and, after discovery of the estrogen receptors, their specific biologic actions. Molecular techniques facilitated understanding of the specific transcriptional and translational events requiring estrogen. This body of knowledge led to methods to prevent and treat hormone-dependent neoplasms as well as a variety of other estrogen-related conditions. More recently, the role of estrogen in men was uncovered by prismatic examples of estrogen deficiency in male patients and by knockout of the estrogen receptor and aromatase in animals. As studies became more extensive, the effects of estrogen on nearly every organ were described. We conclude that the history of estrogen illustrates the role of intellectual reasoning, motivation, and serendipity in advancing knowledge about this important sex steroid.
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Affiliation(s)
- Richard J Santen
- Division of Endocrinology and Metabolism, University of Virginia, Charlottesville, Virginia
| | - Evan Simpson
- Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Centre for Reproductive Health, Queen's Medical Research Institute, University of Edinburgh Medical School, Edinburgh, United Kingdom
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Association of Androgen Excess with Glucose Intolerance in Women with Polycystic Ovary Syndrome. BIOMED RESEARCH INTERNATIONAL 2018; 2018:6869705. [PMID: 29707577 PMCID: PMC5863307 DOI: 10.1155/2018/6869705] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 01/03/2018] [Accepted: 02/07/2018] [Indexed: 02/06/2023]
Abstract
Women with polycystic ovary syndrome (PCOS) show high prevalence of glucose intolerance. This study aimed to investigate the association of androgen excess with glucose intolerance in PCOS. A total of 378 women with PCOS participated in the study. Free androgen index (FAI) was selected as indicator of hyperandrogenism. Insulin sensitivity was assessed by 1/homeostasis model assessment of insulin resistance (1/HOMA-IR) and Matsuda insulin sensitivity index (ISIM); β-cell function was assessed by disposition index (DI). We found that women with glucose intolerance had higher FAI levels compared to women with normal glucose tolerance (NGT) (prediabetes 6.2, T2DM 7.9 versus NGT 5.0, resp.; p < 0.001). Furthermore, there was a direct association between FAI levels and frequency of glucose intolerance (OR = 2.480, 95% CI 1.387–4.434), even after adjusting for age, BMI, waist circumference, hypertension, fasting insulin, testosterone, SHBG, and family history of diabetes. In addition, with FAI increase, glycosylated hemoglobin (HbA1c), plasma glucose concentrations, and serum insulin levels increased, while insulin sensitivity and β-cell function decreased. Our results suggested that androgen excess indicated by high FAI levels might serve as indicator of glucose intolerance, as it might promote insulin resistance and β-cell dysfunction in women with PCOS.
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20
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Song X, Shen Q, Fan L, Yu Q, Jia X, Sun Y, Bai W, Kang J. Dehydroepiandrosterone-induced activation of mTORC1 and inhibition of autophagy contribute to skeletal muscle insulin resistance in a mouse model of polycystic ovary syndrome. Oncotarget 2018; 9:11905-11921. [PMID: 29552281 PMCID: PMC5844717 DOI: 10.18632/oncotarget.24190] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 12/04/2017] [Indexed: 11/25/2022] Open
Abstract
Polycystic ovary syndrome (PCOS) is the most common endocrinopathy in women of reproductive age and also an important metabolic disorder associated with insulin resistance (IR). Hyperandrogenism is a key feature of PCOS. However, whether hyperandrogenism can cause IR in PCOS remains largely unknown. The mammalian target of rapamycin complex 1 (mTORC1) and its regulated autophagy are closely associated with IR. In the present study, we investigated the role of mTORC1-autophagy pathway in skeletal muscle IR in a dehydroepiandrosterone (DHEA)-induced PCOS mouse model. DHEA-treated mice exhibited whole-body and skeletal muscle IR, along with the activated mTORC1, repressed autophagy, impaired mitochondria, and reduced plasma membrane glucose transporter 4 (GLUT4) expression in skeletal muscle of the mice. In cultured C2C12 myotubes, treatment with high dose testosterone activated mTORC1, reduced autophagy, impaired mitochondria, decreased insulin-stimulated glucose uptake, and induced IR. Inhibition of mTORC1 or induction of autophagy restored mitochondrial function, up-regulated insulin-stimulated glucose uptake, and increased insulin sensitivity. On the contrary, inhibition of autophagy exacerbated testosterone-induced impairment. Our findings suggest that the mTORC1-autophagy pathway might contribute to androgen excess-induced skeletal muscle IR in prepubertal female mice by impairing mitochondrial function and reducing insulin-stimulated glucose uptake. These data would help understanding the role of hyperandrogenism and the underlying mechanism in the pathogenesis of skeletal muscle IR in PCOS.
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Affiliation(s)
- Xi Song
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Qiyang Shen
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Liting Fan
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Qiuxiao Yu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
| | - Xiao Jia
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Yu Sun
- Department of Obstetrics and Gynecology, Beijing Shijitan Hospital, Beijing, China
| | - Wenpei Bai
- Department of Obstetrics and Gynecology, Beijing Shijitan Hospital, Beijing, China
| | - Jihong Kang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
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21
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Pjanic M. The role of polycarbonate monomer bisphenol-A in insulin resistance. PeerJ 2017; 5:e3809. [PMID: 28929027 PMCID: PMC5600722 DOI: 10.7717/peerj.3809] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 08/24/2017] [Indexed: 02/06/2023] Open
Abstract
Bisphenol A (BPA) is a synthetic unit of polycarbonate polymers and epoxy resins, the types of plastics that could be found in essentially every human population and incorporated into almost every aspect of the modern human society. BPA polymers appear in a wide range of products, from liquid storages (plastic bottles, can and glass linings, water pipes and tanks) and food storages (plastics wraps and containers), to medical and dental devices. BPA polymers could be hydrolyzed spontaneously or in a photo- or temperature-catalyzed process, providing widespread environmental distribution and chronic exposure to the BPA monomer in contemporary human populations. Bisphenol A is also a xenoestrogen, an endocrine-disrupting chemical (EDC) that interferes with the endocrine system mimicking the effects of an estrogen and could potentially keep our endocrine system in a constant perturbation that parallels endocrine disruption arising during pregnancy, such as insulin resistance (IR). Gestational insulin resistance represents a natural biological phenomenon of higher insulin resistance in peripheral tissues of the pregnant females, when nutrients are increasingly being directed to the embryo instead of being stored in peripheral tissues. Gestational diabetes mellitus may appear in healthy non-diabetic females, due to gestational insulin resistance that leads to increased blood sugar levels and hyperinsulinemia (increased insulin production from the pancreatic beta cells). The hypothesis states that unnoticed and constant exposure to this environmental chemical might potentially lead to the formation of chronic low-level endocrine disruptive state that resembles gestational insulin resistance, which might contribute to the development of diabetes. The increasing body of evidence supports the major premises of this hypothesis, as exemplified by the numerous publications examining the association of BPA and insulin resistance, both epidemiological and mechanistic. However, to what extent BPA might contribute to the development of diabetes in the modern societies still remains unknown. In this review, I discuss the chemical properties of BPA and the sources of BPA contamination found in the environment and in human tissues. I provide an overview of mechanisms for the proposed role of bisphenol A in insulin resistance and diabetes, as well as other related diseases, such as cardiovascular diseases. I describe the transmission of BPA effects to the offspring and postulate that gender related differences might originate from differences in liver enzyme levels, such as UDP-glucuronosyltransferase, which is involved in BPA processing and its elimination from the organism. I discuss the molecular mechanisms of BPA action through nuclear and membrane-bound ER receptors, non-monotonic dose response, epigenetic modifications of the DNA and propose that chronic exposure to weak binders, such as BPA, may mimic the effects of strong binders, such as estrogens.
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Affiliation(s)
- Milos Pjanic
- Department of Medicine, Division of Cardiovascular Medicine, Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, United States of America
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22
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Niu Y, Wang T, Liu S, Yuan H, Li H, Fu L. Exercise-induced GLUT4 transcription via inactivation of HDAC4/5 in mouse skeletal muscle in an AMPKα2-dependent manner. Biochim Biophys Acta Mol Basis Dis 2017; 1863:2372-2381. [PMID: 28688716 DOI: 10.1016/j.bbadis.2017.07.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 06/19/2017] [Accepted: 07/05/2017] [Indexed: 12/19/2022]
Abstract
Abnormal glucose metabolism induces various metabolic disorders such as insulin resistance and type 2 diabetes. Regular exercise improved glucose uptake and enhanced glucose oxidation by increasing GLUT4 transcription in skeletal muscle. However, the regulatory mechanisms of GLUT4 transcription in response to exercise are poorly understood. AMPK is a sensor of exercise and upstream kinase of class II HDACs that act as transcriptional repressors. We used 6-week treadmill exercise or one single-bout exercise wild type or AMPKα2-/- C57BL/6J mice to explore how HDACs regulate GLUT4 transcription and the underlying molecular mechanisms mediated by AMPK in the physiologic process of exercise. We demonstrate that regular physical exercise significantly enhanced GLUT4 transcription by inactivating HDAC4/5 in skeletal muscle by ChIP experiment. HDAC4 coordinately regulated with HDAC5 represses transcriptional activity of GLUT4 promoter in C2C12 myotubes by Luciferase assay. If either HDAC4 or HDAC5 is silenced via RNAi technology, the functional compensation by the other will occur. In addition, a single-bout of exercise decreased HDAC4/5 activity in skeletal muscle of wild type but not in AMPKα2-/- mice, suggesting an AMPKα2-dependent manner. Those findings provide new insight into the mechanisms responsible for AMPKα2-dependent regulation of GLUT4 transcription after exercise.
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Affiliation(s)
- Yanmei Niu
- Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin 300070, China
| | - Tianyi Wang
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Tianjin Medical University, Tianjin 300070, China
| | - Sujuan Liu
- Department of Anatomy and Embryology, School of Basic Medical Science, Tianjin Medical University, Tianjin 300070, China
| | - Hairui Yuan
- Key Laboratory of Hormones and Development (Ministry of Health), Tianjin Key Laboratory of Metabolic Diseases, Tianjin Metabolic Diseases Hospital, Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China
| | - Huige Li
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Tianjin Medical University, Tianjin 300070, China
| | - Li Fu
- Department of Physiology and Pathophysiology, School of Basic Medical Science, Tianjin Medical University, Tianjin 300070, China.
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Sarkar D, Singh SK. Maternal exposure to polybrominated diphenyl ether (BDE-209) during lactation affects germ cell survival with altered testicular glucose homeostasis and oxidative status through down-regulation of Cx43 and p27Kip1 in prepubertal mice offspring. Toxicology 2017; 386:103-119. [DOI: 10.1016/j.tox.2017.05.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 05/12/2017] [Accepted: 05/27/2017] [Indexed: 11/29/2022]
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