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Tsuji A, Ikeda Y, Murakami M, Kitagishi Y, Matsuda S. Reduction of oocyte lipid droplets and meiotic failure due to biotin deficiency was not rescued by restoring the biotin nutritional status. Nutr Res Pract 2022; 16:314-329. [PMID: 35663441 PMCID: PMC9149319 DOI: 10.4162/nrp.2022.16.3.314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 06/29/2021] [Accepted: 09/09/2021] [Indexed: 11/04/2022] Open
Affiliation(s)
- Ai Tsuji
- Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
| | - Yuka Ikeda
- Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
| | - Mutsumi Murakami
- Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
| | - Yasuko Kitagishi
- Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
| | - Satoru Matsuda
- Department of Food Science and Nutrition, Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
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Murata K, Mimura A, Suzuki H, Mikami N, Hamada Y, Kato K, Iki N, Ishida M, Daitoku Y, Tanimoto Y, Okiyoneda T, Fujiyama T, Dinh TTH, Mizuno S, Sugiyama F. Efficient induction of proximity-dependent labelling by biotin feeding in BMAL1-BioID knock-in mice. J Biochem 2021; 170:453-461. [PMID: 33982090 DOI: 10.1093/jb/mvab059] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/06/2021] [Indexed: 11/13/2022] Open
Abstract
Proximity-dependent biotin identification (BioID) is a useful method to identify unknown protein-protein interactions. Few reports have described genetically engineered knock-in mouse models for in vivo BioID. Thus, little is known about the proper method for biotin administration and which tissues are applicable. Here, we established a BioID knock-in mouse model of Brain and Muscle ARNT-Like 1 (BMAL1) and the BirA biotin ligase with R118G mutation (BirA*). The BMAL1-BioID mouse model was used to investigate the effect of biotin diet feeding on protein biotinylation in several tissues. The BMAL1-BirA* fusion protein-retained proper intracellular localization of BMAL1 and binding to CLOCK protein in HEK293T cells. A biotin labelling assay in mouse embryonic fibroblasts revealed the protein biotinylation activity of BMAL1-BirA* expressed in knock-in mouse cells depending on biotin supplementation. Lastly, feeding a 0.5% biotin diet for 7 days induced protein biotinylation in the brain, heart, testis and liver of BMAL1-BioID mice without adverse effects on spermatogenesis. In the kidney, the biotin diet increased biotinylated protein levels in BMAL1-BioID and control mice, suggesting the existence of endogenous biotinylation activity. These results provide valuable information to optimize the in vivo BioID procedure.
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Affiliation(s)
- Kazuya Murata
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Asuka Mimura
- College of Biological Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Hayate Suzuki
- Doctoral Program in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Natsuki Mikami
- School of Medical Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Yuko Hamada
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Kanako Kato
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Natsumi Iki
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Miyuki Ishida
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Yoko Daitoku
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Yoko Tanimoto
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Tsukasa Okiyoneda
- Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
| | - Tomoyuki Fujiyama
- International Institute for Integrative Sleep Medicine (WPI-IIIS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Tra Thi Huong Dinh
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Seiya Mizuno
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - Fumihiro Sugiyama
- Laboratory Animal Resource Center, Transborder Medical Research Center, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
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Caputo M, Pigni S, Agosti E, Daffara T, Ferrero A, Filigheddu N, Prodam F. Regulation of GH and GH Signaling by Nutrients. Cells 2021; 10:1376. [PMID: 34199514 PMCID: PMC8227158 DOI: 10.3390/cells10061376] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 02/06/2023] Open
Abstract
Growth hormone (GH) and insulin-like growth factor-1 (IGF-I) are pleiotropic hormones with important roles in lifespan. They promote growth, anabolic actions, and body maintenance, and in conditions of energy deprivation, favor catabolic feedback mechanisms switching from carbohydrate oxidation to lipolysis, with the aim to preserve protein storages and survival. IGF-I/insulin signaling was also the first one identified in the regulation of lifespan in relation to the nutrient-sensing. Indeed, nutrients are crucial modifiers of the GH/IGF-I axis, and these hormones also regulate the complex orchestration of utilization of nutrients in cell and tissues. The aim of this review is to summarize current knowledge on the reciprocal feedback among the GH/IGF-I axis, macro and micronutrients, and dietary regimens, including caloric restriction. Expanding the depth of information on this topic could open perspectives in nutrition management, prevention, and treatment of GH/IGF-I deficiency or excess during life.
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Affiliation(s)
- Marina Caputo
- SCDU of Endocrinology, University Hospital Maggiore della Carità, 28100 Novara, Italy; (M.C.); (S.P.); (T.D.); (A.F.)
- Department of Health Sciences, Università del Piemonte Orientale, 28100 Novara, Italy;
| | - Stella Pigni
- SCDU of Endocrinology, University Hospital Maggiore della Carità, 28100 Novara, Italy; (M.C.); (S.P.); (T.D.); (A.F.)
| | - Emanuela Agosti
- Department of Health Sciences, Università del Piemonte Orientale, 28100 Novara, Italy;
| | - Tommaso Daffara
- SCDU of Endocrinology, University Hospital Maggiore della Carità, 28100 Novara, Italy; (M.C.); (S.P.); (T.D.); (A.F.)
| | - Alice Ferrero
- SCDU of Endocrinology, University Hospital Maggiore della Carità, 28100 Novara, Italy; (M.C.); (S.P.); (T.D.); (A.F.)
| | - Nicoletta Filigheddu
- Department of Translational Medicine, Università del Piemonte Orientale, 28100 Novara, Italy;
| | - Flavia Prodam
- SCDU of Endocrinology, University Hospital Maggiore della Carità, 28100 Novara, Italy; (M.C.); (S.P.); (T.D.); (A.F.)
- Department of Health Sciences, Università del Piemonte Orientale, 28100 Novara, Italy;
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Smeets ETHC, Schutzler SE, Wei JY, Azhar G, Wolfe RR. Do anabolic nutritional supplements stimulate human growth hormone secretion in elderly women with heart failure? Physiol Rep 2017; 5:e13366. [PMID: 28778993 PMCID: PMC5555892 DOI: 10.14814/phy2.13366] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 06/28/2017] [Accepted: 07/03/2017] [Indexed: 12/22/2022] Open
Abstract
Growth hormone treatment has gained attention over the past decade as a treatment for heart failure. Human growth hormone (HGH) must be administered by injections (usually daily), so there is considerable advantage to stimulation of endogenous secretion by amino acid-based nutritional supplementation. However, studies investigating the effect of amino acid (AA) supplementation show conflicting results. Therefore, in this study we aimed to investigate the effect of nutritional supplementation on HGH production in elderly women with heart failure. Eight elderly women with heart failure participated in this randomized cross-over study. Plasma HGH concentration was measured before and for 4 h following ingestion of a mixture of protein, carbohydrate, and fat or an AA beverage. HGH concentration was determined with ELISA kits and AA concentrations were analyzed by Liquid Chromatography-Mass Spectrometry (LCMS). Linear mixed models was performed to analyze the effect of time, treatment, and interaction. Plasma arginine and lysine concentrations were significantly higher after consumption of the AA drink compared to the mixture of protein, carbohydrate, and fat. Nonetheless, only ingestion of the protein, carbohydrate, and fat mixture (meal replacement) increased HGH concentration. HGH concentration was increased in elderly women with heart failure following consumption of a meal replacement containing protein, carbohydrate, and fat. Consumption of a mixture of amino acids failed to increase HGH concentration despite significantly greater elevations in plasma amino acid concentrations, including arginine and lysine. The stimulatory effect of the protein/carbohydrate/fat mixture was presumably mediated by factors other than increases in free amino acid concentrations.
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Affiliation(s)
- Ellen T H C Smeets
- Department of Human Nutrition, Wageningen University, Wageningen, The Netherlands
| | - Scott E Schutzler
- Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Jeanne Y Wei
- Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Gohar Azhar
- Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Robert R Wolfe
- Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas
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Subramanian VS, Constantinescu AR, Benke PJ, Said HM. Mutations in SLC5A6 associated with brain, immune, bone, and intestinal dysfunction in a young child. Hum Genet 2016; 136:253-261. [PMID: 27904971 DOI: 10.1007/s00439-016-1751-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 11/20/2016] [Indexed: 01/13/2023]
Abstract
The human sodium-dependent multivitamin transporter (hSMVT) is a product of the SLC5A6 gene and mediates biotin, pantothenic acid, and lipoate uptake in a variety of cellular systems. We report here the identification of mutations R94X, a premature termination, and R123L, a dysfunctional amino acid change, both in exon 3 of the SLC5A6 gene in a child using whole genome-scanning. At 15 months of age, the child showed failure to thrive, microcephaly and brain changes on MRI, cerebral palsy and developmental delay, variable immunodeficiency, and severe gastro-esophageal reflux requiring a gastrostomy tube/fundoplication, osteoporosis, and pathologic bone fractures. After identification of the SLC5A6 mutations, he responded clinically to supplemental administration of excess biotin, pantothenic acid, and lipoate with improvement in clinical findings. Functionality of the two mutants was examined by 3H-biotin uptake assay following expression of the mutants in human-derived intestinal HuTu-80 and brain U87 cells. The results showed severe impairment in biotin uptake in cells expressing the mutants compared to those expressing wild-type hSMVT. Live cell confocal imaging of cells expressing the mutants showed the R94X mutant to be poorly tolerated and localized in the cytoplasm, while the R123L mutant was predominantly retained in the endoplasmic reticulum. This is the first reporting of mutations in the SLC5A6 gene in man, and suggests that this gene is important for brain development and a wide variety of clinical functions.
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Affiliation(s)
- Veedamali S Subramanian
- Departments of Medicine and Physiology/Biophysics, University of California, Irvine, CA 92697.,Department of Veterans Affairs Medical Center, Long Beach, CA 90822
| | - Alexandru R Constantinescu
- Divisions of Nephrology, Joe DiMaggio Children's Hospital and the Charles E Schmidt College of Medicine, Hollywood, FL 33021
| | - Paul J Benke
- Divisions of Genetics, Joe DiMaggio Children's Hospital and the Charles E Schmidt College of Medicine, Hollywood, FL 33021
| | - Hamid M Said
- Departments of Medicine and Physiology/Biophysics, University of California, Irvine, CA 92697.,Department of Veterans Affairs Medical Center, Long Beach, CA 90822
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Sabui S, Bohl JA, Kapadia R, Cogburn K, Ghosal A, Lambrecht NW, Said HM. Role of the sodium-dependent multivitamin transporter (SMVT) in the maintenance of intestinal mucosal integrity. Am J Physiol Gastrointest Liver Physiol 2016; 311:G561-70. [PMID: 27492331 PMCID: PMC5076003 DOI: 10.1152/ajpgi.00240.2016] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 07/25/2016] [Indexed: 02/07/2023]
Abstract
Utilizing a conditional (intestinal-specific) knockout (cKO) mouse model, we have recently shown that the sodium-dependent multivitamin transporter (SMVT) (SLC5A6) is the only biotin uptake system that operates in the gut and that its deletion leads to biotin deficiency. Unexpectedly, we also observed that all SMVT-cKO mice develop chronic active inflammation, especially in the cecum. Our aim here was to examine the role of SMVT in the maintenance of intestinal mucosal integrity [permeability and expression of tight junction (TJ) proteins]. Our results showed that knocking out the mouse intestinal SMVT is associated with a significant increase in gut permeability and with changes in the level of expression of TJ proteins. To determine whether these changes are related to the state of biotin deficiency that develops in SMVT-cKO mice, we induced (by dietary means) biotin deficiency in wild-type mice and examined its effect on the above-mentioned parameters. The results showed that dietary-induced biotin deficiency leads to a similar development of chronic active inflammation in the cecum with an increase in the level of expression of proinflammatory cytokines, as well as an increase in intestinal permeability and changes in the level of expression of TJ proteins. We also examined the effect of chronic biotin deficiency on permeability and expression of TJ proteins in confluent intestinal epithelial Caco-2 monolayers but observed no changes in these parameters. These results show that the intestinal SMVT plays an important role in the maintenance of normal mucosal integrity, most likely via its role in providing biotin to different cells of the gut mucosa.
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Affiliation(s)
- Subrata Sabui
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
| | - Jennifer Ann Bohl
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
| | - Rubina Kapadia
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
| | - Kyle Cogburn
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
| | - Abhisek Ghosal
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
| | - Nils W. Lambrecht
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
| | - Hamid M. Said
- 1Department of Medical Research, VA Medical Center, Long Beach, California; ,2Departments of Medicine, University of California, Irvine, California; ,3Department of Physiology/Biophysics, University of California, Irvine, California
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Tsuji A, Nakamura T, Shibata K. Biotin-deficient diet induces chromosome misalignment and spindle defects in mouse oocytes. Biosci Biotechnol Biochem 2015; 79:292-9. [DOI: 10.1080/09168451.2014.968090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Abstract
Increased abnormal oocytes due to meiotic chromosome misalignment and spindle defects lead to elevated rates of infertility, miscarriage, and trisomic conceptions. Here, we investigated the effect of biotin deficiency on oocyte quality. Three-week-old female ICR mice were fed a biotin-deficient or control diet (0, 0.004 g biotin/kg diet) for 21 days. On day 22, these mouse oocytes were analyzed by immunofluorescence. Due to biotin, undernutrition increased the frequency of abnormal oocytes (the biotin deficient vs. control: 40 vs. 16%). Next, the remaining mice in the biotin-deficient group were fed a control or biotin-deficient diet from day 22 to 42. Although biotin nutritional status in the recovery group was restored, the frequency of abnormal oocytes in the recovery group was still higher than that in the control group (48 vs. 18%). Our results indicate that steady, sufficient biotin intake is required for the production of high-quality oocytes in mice.
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Affiliation(s)
- Ai Tsuji
- Department of Nutrition, School of Human Cultures, The University of Shiga Prefecture, Hikone, Japan
| | - Toshinobu Nakamura
- Department of Animal Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Japan
| | - Katsumi Shibata
- Department of Nutrition, School of Human Cultures, The University of Shiga Prefecture, Hikone, Japan
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Larrieta E, Vega-Monroy MLLDL, Vital P, Aguilera A, German MS, Hafidi ME, Fernandez-Mejia C. Effects of biotin deficiency on pancreatic islet morphology, insulin sensitivity and glucose homeostasis. J Nutr Biochem 2011; 23:392-9. [PMID: 21596550 DOI: 10.1016/j.jnutbio.2011.01.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 09/04/2010] [Accepted: 01/06/2011] [Indexed: 11/24/2022]
Abstract
Several studies have revealed that physiological concentrations of biotin are required for the normal expression of critical carbohydrate metabolism genes and for glucose homeostasis. However, the different experimental models used in these studies make it difficult to integrate the effects of biotin deficiency on glucose metabolism. To further investigate the effects of biotin deficiency on glucose metabolism, we presently analyzed the effect of biotin deprivation on glucose homeostasis and on pancreatic islet morphology. Three-week-old male BALB/cAnN Hsd mice were fed a biotin-deficient or a biotin-control diet (0 or 7.2 μmol of free biotin/kg diet, respectively) over a period of 8 weeks. We found that biotin deprivation caused reduced concentrations of blood glucose and serum insulin concentrations, but increased plasma glucagon levels. Biotin-deficient mice also presented impaired glucose and insulin tolerance tests, indicating defects in insulin sensitivity. Altered insulin signaling was linked to a decrease in phosphorylated Akt/PKB but induced no change in insulin receptor abundance. Islet morphology studies revealed disruption of islet architecture due to biotin deficiency, and an increase in the number of α-cells in the islet core. Morphometric analyses found increased islet size, number of islets and glucagon-positive area, but a decreased insulin-positive area, in the biotin-deficient group. Glucagon secretion and gene expression increased in islets isolated from biotin-deficient mice. Our results suggest that biotin deficiency promotes hyperglycemic mechanisms such as increased glucagon concentration and decreased insulin secretion and sensitivity to compensate for reduced blood glucose concentrations. Variations in glucose homeostasis may participate in the changes observed in pancreatic islets.
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Affiliation(s)
- Elena Larrieta
- Unidad de Genética de la Nutrición, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México/Instituto Nacional de Pediatría, Mexico
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Pharmacological concentrations of biotin reduce serum triglycerides and the expression of lipogenic genes. Eur J Pharmacol 2010; 644:263-8. [DOI: 10.1016/j.ejphar.2010.07.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 06/29/2010] [Accepted: 07/11/2010] [Indexed: 11/19/2022]
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Báez-Saldaña A, Camacho-Arroyo I, Espinosa-Aguirre JJ, Neri-Gómez T, Rojas-Ochoa A, Guerra-Araiza C, Larrieta E, Vital P, Díaz G, Chavira R, Fernandez-Mejia C. Biotin deficiency and biotin excess: effects on the female reproductive system. Steroids 2009; 74:863-9. [PMID: 19540254 DOI: 10.1016/j.steroids.2009.06.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2008] [Revised: 05/29/2009] [Accepted: 06/03/2009] [Indexed: 11/26/2022]
Abstract
Biotin deficiency and biotin excess have both been found to affect reproduction and cause teratogenic effects. In the reproductive tract, however, the effects of biotin have not been well established yet. We investigated the effects of varying biotin content diets on the oestrus cycle, ovarian morphology, estradiol and progesterone serum levels, and the uterine mRNA abundance of their nuclear receptors, as well as on the activity of the estradiol-degrading group of enzymes cytochrome P450 (CYP) in the liver. Three-week-old female BALB/cAnN Hsd mice were fed a biotin-deficient, a biotin-control, or a biotin-supplemented diet (0, 7.2 or 400 micromol of free biotin/kg diet, respectively) over a period of nine weeks. Striking effects were observed in the biotin-deficient group: mice showed arrested estrous cycle on the day of diestrus and changes in ovary morphology. Estradiol serum concentration increased 49.2% in biotin-deficient mice compared to the control group, while the enzymatic activities of CYP1A2 and CYP2B2 increased (P<0.05). The mRNA abundance of nuclear estrogen and progesterone receptors decreased in the biotin-deficient mice. In the biotin-supplemented group we found that, in spite of a significant (P<0.05) decrease in the number of primary and Graafian follicles and in CYP1A2 activities, mice exhibited 105.4% higher serum estradiol concentration than the control group. No changes in the expression of the nuclear receptors were observed. No significant differences were observed in serum progesterone among the groups. Our results indicate that both the deficiency and the excess of biotin have significant effects on the female mouse reproductive system.
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Affiliation(s)
- Armida Báez-Saldaña
- Departamento de Biología Celular, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico
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