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Pelayo R, Marina H, Suárez-Vega A, Hervás G, Esteban-Blanco C, Gausseres B, Foucras G, Arranz JJ, Gutiérrez-Gil B. Influence of a temporary restriction of dietary protein in prepubertal ewe lambs on first lactation milk traits and response to a mammary gland inflammatory challenge. Res Vet Sci 2023; 159:57-65. [PMID: 37084523 DOI: 10.1016/j.rvsc.2023.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 04/04/2023] [Accepted: 04/13/2023] [Indexed: 04/23/2023]
Abstract
This study evaluated the influence of a temporary nutritional protein restriction (NPR) performed, under commercial conditions, in prepubertal female lambs on first lactation milk production traits and the inflammatory response triggered by an inflammatory challenge of the. From 40 Assaf female lambs, we defined a control group (Cn = 20), which received a standard diet for replacement lambs and the NPR group (n = 20), which received the same diet but without soybean meal between 3 and 5 months of age. About 150 days after lambing, 24 of these ewes (13 NPR, 11C) were subjected to an intramammary infusion of E. coli lipopolysaccharide (LPS). Our dynamic study identified indicator traits of local (SCC) and systemic (rectal Ta, IL-6, CXCL8, IL-10, IL-36RA, VEGF-A) response to the LPS challenge. The NPR did not show significant effects on milk production traits and did not affect the SCC and rectal Ta after the LPS challenge. However, the NPR had a significant influence on 8 of the 14 plasma biomarkers analysed, in all the cases with higher relative values in the C group. The effects observed on VEGF-A (involved in vasculogenesis during mammary gland development and vascular permeability) and IL-10 (a regulatory cytokine classically known by its anti-inflammatory action) are the most remarkable to explain the differences found between groups. Whereas further studies should be undertaken to confirm these results, our findings are of interest considering the current concern about the future world's demand for protein and the need for animal production systems to evolve toward sustainability.
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Affiliation(s)
- Rocío Pelayo
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
| | - Héctor Marina
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
| | - Aroa Suárez-Vega
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
| | - Gonzalo Hervás
- Instituto de Ganadería de Montaña (CSIC-University of León), Finca Marzanas s/n, 24346 Grulleros, León, Spain
| | - Cristina Esteban-Blanco
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
| | - Blandine Gausseres
- Université de Toulouse, École Nationale Vétérinaire de Toulouse (ENVT), INRAE, Interactions Hôtes - Agents Pathogènes (IHAP), F-31076 Toulouse, France
| | - Gilles Foucras
- Université de Toulouse, École Nationale Vétérinaire de Toulouse (ENVT), INRAE, Interactions Hôtes - Agents Pathogènes (IHAP), F-31076 Toulouse, France
| | - Juan J Arranz
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain
| | - Beatriz Gutiérrez-Gil
- Departamento de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071 León, Spain.
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Cavariani MM, de Mello Santos T, Chuffa LGDA, Pinheiro PFF, Scarano WR, Domeniconi RF. Maternal Protein Restriction Alters the Expression of Proteins Related to the Structure and Functioning of the Rat Offspring Epididymis in an Age-Dependent Manner. Front Cell Dev Biol 2022; 10:816637. [PMID: 35517501 PMCID: PMC9061959 DOI: 10.3389/fcell.2022.816637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 04/05/2022] [Indexed: 11/16/2022] Open
Abstract
Nutrition is an environmental factor able to activate physiological interactions between fetus and mother. Maternal protein restriction is able to alter sperm parameters associated with epididymal functions. Since correct development and functioning of the epididymides are fundamental for mammalian reproductive success, this study investigated the effects of maternal protein restriction on epididymal morphology and morphometry in rat offspring as well as on the expression of Src, Cldn-1, AR, ER, aromatase p450, and 5α-reductase in different stages of postnatal epididymal development. For this purpose, pregnant females were allocated to normal-protein (NP—17% protein) and low-protein (LP—6% protein) groups that received specific diets during gestation and lactation. After weaning, male offspring was provided only normal-protein diet until the ages of 21, 44, and 120 days, when they were euthanized and their epididymides collected. Maternal protein restriction decreased genital organs weight as well as crown-rump length and anogenital distance at all ages. Although the low-protein diet did not change the integrity of the epididymal epithelium, we observed decreases in tubular diameter, epithelial height and luminal diameter of the epididymal duct in 21-day-old LP animals. The maternal low-protein diet changed AR, ERα, ERβ, Src 416, and Src 527 expression in offspring epididymides in an age-dependent manner. Finally, maternal protein restriction increased Cldn-1 expression throughout the epididymides at all analyzed ages. Although some of these changes did not remain until adulthood, the insufficient supply of proteins in early life altered the structure and functioning of the epididymis in important periods of postnatal development.
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de Morais Oliveira DA, Lupi LA, Silveira HS, de Almeida Chuffa LG. Protein restriction during puberty alters nutritional parameters and affects ovarian and uterine histomorphometry in adulthood in rats. Int J Exp Pathol 2021; 102:93-104. [PMID: 33729619 PMCID: PMC7981593 DOI: 10.1111/iep.12388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 11/23/2020] [Accepted: 12/23/2020] [Indexed: 02/06/2023] Open
Abstract
In a large part of the population inefficient ingestion of proteins, whether for cultural, aesthetic or economic reasons, is a global concern. Low-protein diets can cause severe functional complications, mainly during the development and maturation of organs and systems, including the female reproductive system. The present study investigated the effect of nutritional protein restriction during puberty on the oestrous cycle and expression of sex steroid receptors (AR, ERα e ERβ) in ovarian and uterine tissues of adult rats. Protein restriction promoted lower body weight gain, feed efficiency and higher caloric intake. There was an increase in the oestrus phase arrest without changing the total length of the oestrous cycle. The consumption of low-protein diet also reduced the thickness of the uterine endometrium (uterine epithelium and endometrial stroma) in addition to increasing the number of primary and atretic follicles in the ovaries. Furthermore, the low-protein diet reduced the levels of androgen receptor (AR) and increased the oestrogen receptor β (ERβ) in the ovary, while no significant changes were observed in the uterus. Our study reinforces the importance of adequate protein intake during puberty, since physiological changes in this developmental period interfere with the histomorphometry of the ovaries and uteri, possibly resulting in impaired folliculogenesis and fertility in the reproductive period.
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Affiliation(s)
- Diego Augusto de Morais Oliveira
- Department of Structural and Functional BiologyInstitute of BiosciencesUNESP ‐ São Paulo State UniversityBotucatu, São PauloBrazil
- Graduate Program in NutritionInstitute of Biosciences of BotucatuUNESPSão PauloBrazil
| | - Luiz Antonio Lupi
- Department of Structural and Functional BiologyInstitute of BiosciencesUNESP ‐ São Paulo State UniversityBotucatu, São PauloBrazil
| | - Henrique Spaulonci Silveira
- Department of Structural and Functional BiologyInstitute of BiosciencesUNESP ‐ São Paulo State UniversityBotucatu, São PauloBrazil
| | - Luiz Gustavo de Almeida Chuffa
- Department of Structural and Functional BiologyInstitute of BiosciencesUNESP ‐ São Paulo State UniversityBotucatu, São PauloBrazil
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Côrtes LS, Silveira HS, Lupi LA, de Mello Santos T, Cavariani MM, Domeniconi RF, Gaiotte LB, de Morais Oliveira DA, Justulin LA, de Almeida Chuffa LG. Maternal protein restriction impairs nutrition and ovarian histomorphometry without changing p38MAPK and PI3K-AKT-mTOR signaling in adult rat ovaries. Life Sci 2021; 264:118693. [PMID: 33130082 DOI: 10.1016/j.lfs.2020.118693] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 10/27/2020] [Indexed: 12/15/2022]
Abstract
AIMS Because an adequate protein supply is detrimental for the maintenance of folliculogenesis and ovulation, we evaluated the impact of maternal low protein diet on nutritional parameters, estrous cycle, ovarian histomorphometry, and on the expression of metabolic and survival signaling molecules in different follicular stages. MAIN METHODS Twenty Wistar pregnant rats were divided into two groups: the normoprotein (NP) group, composed of animals that received 17% protein, and a low-protein (LP) group, composed of animals that received 6% protein during gestation and lactation period. After weaning, female rats were fed with standard diet until the 120-days-old. KEY FINDINGS LP animals showed reduced body mass index, total body weight, energy intake, feed efficiency, and visceral fat. The ovarian tissue presented vascular congestion and fat accumulation in the medulla, followed by a significant reduction in the amount of primordial and primary follicles. In addition, the number of atretic follicles was higher in LP than in NP animals. Maternal undernutrition also resulted in increased levels of estradiol (E2) and progesterone (P4) while testosterone (T) was unchanged in the offspring. Although discrete changes in p38MAPK and in PI3K-AKT-mTOR immunostaining were observed in the ovarian follicles and corpus luteum in LP, no differences were found at their protein levels. SIGNIFICANCE Maternal protein restriction alters estrous cycle and histomorphometry of the offspring's ovary without changing the levels of intracellular regulatory molecules in adulthood. These morphofunctional changes may alter reproductive performance in female offspring, highlighting maternal dietary conditions as an important factor for offspring reproductive health.
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Affiliation(s)
- Lucas Silva Côrtes
- Faculty of Medicine of Botucatu, São Paulo State University-UNESP, 18618-687 Botucatu, SP, Brazil
| | - Henrique Spaulonci Silveira
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Luiz Antonio Lupi
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Talita de Mello Santos
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Marilia Martins Cavariani
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Raquel Fantin Domeniconi
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Letícia Barbosa Gaiotte
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Diego Augusto de Morais Oliveira
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Luis Antonio Justulin
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil
| | - Luiz Gustavo de Almeida Chuffa
- Department of Structural and Functional Biology, Institute of Biosciences (IBB), São Paulo State University-UNESP, 18618-689, Botucatu, SP, Brazil.
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Ajuogu PK, Al-Aqbi MAK, Hart RA, McFarlane JR, Smart NA. A low protein maternal diet during gestation has negative effects on male fertility markers in rats - A Systematic Review and Meta-analysis. J Anim Physiol Anim Nutr (Berl) 2020; 105:157-166. [PMID: 32654274 DOI: 10.1111/jpn.13411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 02/20/2020] [Accepted: 04/08/2020] [Indexed: 12/11/2022]
Abstract
Research indicates that some adult diseases including reproductive pathologies are programmed in utero during foetal development. In particular, maternal low dietary protein, during the most critical developmental periods of male foetal development, may have a detrimental impact on male fertility through direct and epigenetic mechanisms. The aim of our study was to evaluate the impact of a gestational low protein diet on fertility markers in male offspring in rats through a systematic review and meta-analysis. A systematic search using PubMed, and EMBASE databases was performed and two investigators independently screened the 1,703 prospective articles. Eleven articles met the eligibility criteria. Outcome measures were pooled using random-effects models and expressed as mean differences (MDs) at 95% CIs for each study. The results reveal significant reduction in testis weight (MD (mean difference) -0.08 g; -0.12, -0.42; p = .0001), epididymal sperm count (MD -35.34 × 106 cells; -52.15, -18.53; p = .0001), number of Sertoli cells (MD -7.27 × 106 (-13.92, -0.62; p = .03), testosterone (T) concentration (MD -0.29 ng/ml; -0.48, -0.09; p = .004) and luteinising hormone (LH) concentration (MD of -0.24 ng/ml; -0.45, 0.04; p = .02) in comparison with controls. In contrast, follicle-stimulating hormone (FSH) concentration (MD of 0.07 ng/ml; -0.16, 0.29; p = .56) was not significantly different from controls. We conclude that low gestational dietary protein maternal intake potentially negatively impacts fertility in male progeny later in life. The mechanisms of action responsible for these phenomena remain unclear.
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Affiliation(s)
- Peter K Ajuogu
- School of Science and Technology, University of New England, Armidale, NSW, Australia
| | - Mohammed A K Al-Aqbi
- School of Science and Technology, University of New England, Armidale, NSW, Australia.,College of Agriculture, Wasit University, Wasit, Iraq
| | - Robert A Hart
- School of Science and Technology, University of New England, Armidale, NSW, Australia
| | - James R McFarlane
- Centre for Bioactive Discovery in Heath and Ageing, University of New England, Armidale, NSW, Australia
| | - Neil A Smart
- School of Science and Technology, University of New England, Armidale, NSW, Australia
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Kaspar D, Hastreiter S, Irmler M, Hrabé de Angelis M, Beckers J. Nutrition and its role in epigenetic inheritance of obesity and diabetes across generations. Mamm Genome 2020; 31:119-133. [PMID: 32350605 PMCID: PMC7368866 DOI: 10.1007/s00335-020-09839-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 04/15/2020] [Indexed: 02/07/2023]
Abstract
Nutritional constraints including not only caloric restriction or protein deficiency, but also energy-dense diets affect metabolic health and frequently lead to obesity and insulin resistance, as well as glucose intolerance and type 2 diabetes. The effects of these environmental factors are often mediated via epigenetic modifiers that target the expression of metabolic genes. More recently, it was discovered that such parentally acquired metabolic changes can alter the metabolic health of the filial and grand-filial generations. In mammals, this epigenetic inheritance can either follow an intergenerational or transgenerational mode of inheritance. In the case of intergenerational inheritance, epimutations established in gametes persist through the first round of epigenetic reprogramming occurring during preimplantation development. For transgenerational inheritance, epimutations persist additionally throughout the reprogramming that occurs during germ cell development later in embryogenesis. Differentially expressed transcripts, genomic cytosine methylations, and several chemical modifications of histones are prime candidates for tangible marks which may serve as epimutations in inter- and transgenerational inheritance and which are currently being investigated experimentally. We review, here, the current literature in support of epigenetic inheritance of metabolic traits caused by nutritional constraints and potential mechanisms in man and in rodent model systems.
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Affiliation(s)
- Daniela Kaspar
- Institute of Experimental Genetics, Helmholtz Zentrum München GmbH, Neuherberg, Germany
| | - Sieglinde Hastreiter
- Institute of Experimental Genetics, Helmholtz Zentrum München GmbH, Neuherberg, Germany
| | - Martin Irmler
- Institute of Experimental Genetics, Helmholtz Zentrum München GmbH, Neuherberg, Germany
| | - Martin Hrabé de Angelis
- Institute of Experimental Genetics, Helmholtz Zentrum München GmbH, Neuherberg, Germany
- Chair of Experimental Genetics, Technische Universität München, Weihenstephan, Germany
- Deutsches Zentrum für Diabetesforschung E.V. (DZD), Neuherberg, Germany
| | - Johannes Beckers
- Institute of Experimental Genetics, Helmholtz Zentrum München GmbH, Neuherberg, Germany.
- Chair of Experimental Genetics, Technische Universität München, Weihenstephan, Germany.
- Deutsches Zentrum für Diabetesforschung E.V. (DZD), Neuherberg, Germany.
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Zhang J, Tan J, Zhang C, Wang Y, Chen X, Lei C, Chen H, Fang X. Research on associations between variants and haplotypes of Aquaporin 9 (AQP9) gene with growth traits in three cattle breeds. Anim Biotechnol 2019; 32:185-193. [PMID: 31680615 DOI: 10.1080/10495398.2019.1675681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Aquaporin 9 plays critical roles in aspects of energy homeostasis, metabolism, gluconeogenesis, fat synthesis and even the individual growth and development. So the Aquaporin 9 (AQP9) gene is a potential candidate gene for bovine growth traits. In this study, we detected the polymorphism of the bovine AQP9 gene including all exons by PCR-SSCP and DNA sequencing methods with six pairs of PCR primers in 555 individuals from three cattle breeds. Three novel SNPs (NC_007308:g.47575 C > T, 47615 C > T, 47690A > G) were detected using P6 primer. The linkage disequilibrium analysis indicated that the three SNPs were completely linked (r2 = 1), which constructed three genotypes (AA, AB, BB). The genotype AB was dominant in all three breeds. The frequencies of haplotype A and haplotype B were almost equivalent between each other. The individuals with genotype AB were significantly higher than those individuals with genotype BB in body weight (p < 0.01), chest circumference (p < 0.05) and rump length (p < 0.05). Moreover, individuals with genotype AA were significantly higher than those of individuals with genotype BB in body height (p < 0.01). These results suggested that the novel SNPs could be a perfect molecular marker for marker-assisted selection (MAS) breeding.
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Affiliation(s)
- Jingmin Zhang
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China.,Shanghai Vocational College of Agriculture and Forestry, Shanghai, P. R. China
| | - Jiaoyan Tan
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China
| | - Chunlei Zhang
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China
| | - Yanhong Wang
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China
| | - Xi Chen
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China
| | - Chuzhao Lei
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, P. R. China
| | - Hong Chen
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China
| | - Xingtang Fang
- Institute of Cellular and Molecular Biology, Jiangsu Normal University, Xuzhou, P. R. China
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de Mello Santos T, Cavariani MM, Pereira DN, Schimming BC, Chuffa LGDA, Domeniconi RF. Maternal Protein Restriction Modulates Angiogenesis and AQP9 Expression Leading to a Delay in Postnatal Epididymal Development in Rat. Cells 2019; 8:cells8091094. [PMID: 31533210 PMCID: PMC6770568 DOI: 10.3390/cells8091094] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 07/15/2019] [Accepted: 09/02/2019] [Indexed: 12/17/2022] Open
Abstract
The maternal nutritional status is essential to the health and well-being of the fetus. Maternal protein restriction during the perinatal stage causes sperm alterations in the offspring that are associated with epididymal dysfunctions. Vascular endothelial growth factor (VEGF) and its receptor, VEGFr-2, as well as aquaporins (AQPs) are important regulators of angiogenesis and the epididymal microenvironment and are associated with male fertility. We investigated the effects of maternal protein restriction on epididymal angiogenesis and AQP expression in the early stages of postnatal epididymal development. Pregnant rats were divided into two experimental groups that received either a normoprotein (17% protein) or low-protein diet (6% protein) during gestation and lactation. At postnatal day (PND)7 and PND14, male offspring were euthanized, the epididymides were subjected to morphometric and microvascular density analyses and to VEGF-A, VEGF-r2, AQP1 and AQP9 expression analyses. The maternal low-protein diet decreased AQP9 and VEGFr-2 expression, decreased epididymal microvascularity and altered the morphometric features of the epididymal epithelium; no changes in AQP1 expression were observed at the beginning of postnatal epididymal development. Maternal protein restriction alters microvascularization and affects molecules involved in the epidydimal microenvironment, resulting in morphometric alterations related to a delay in the beginning of epididymis postnatal development.
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Affiliation(s)
- Talita de Mello Santos
- Department of Anatomy, Institute of Biosciences, São Paulo State University-UNESP, Botucatu 18618-970, SP, Brazil.
| | - Marilia Martins Cavariani
- Department of Anatomy, Institute of Biosciences, São Paulo State University-UNESP, Botucatu 18618-970, SP, Brazil.
| | - Dhrielly Natália Pereira
- Department of Anatomy, Institute of Biosciences, São Paulo State University-UNESP, Botucatu 18618-970, SP, Brazil.
| | - Bruno César Schimming
- Department of Anatomy, Institute of Biosciences, São Paulo State University-UNESP, Botucatu 18618-970, SP, Brazil.
| | | | - Raquel Fantin Domeniconi
- Department of Anatomy, Institute of Biosciences, São Paulo State University-UNESP, Botucatu 18618-970, SP, Brazil.
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Qin R, Zhang L, Lin D, Xiao F, Guo L. Sirt1 inhibits HG-induced endothelial injury: Role of Mff-based mitochondrial fission and F‑actin homeostasis-mediated cellular migration. Int J Mol Med 2019; 44:89-102. [PMID: 31115479 PMCID: PMC6559301 DOI: 10.3892/ijmm.2019.4185] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 04/18/2019] [Indexed: 12/11/2022] Open
Abstract
Although sirtuin 1 (Sirt1) has been found to be involved in diabetic vasculopathy and high glucose (HG)‑mediated endothelial injury, the underlying mechanisms remain to be fully elucidated. The aim of the present study was to investigate the role of Sirt1 in HG‑induced endothelial injury and its potential mechanism. In the present study, it was demonstrated that HG triggers the downregulation of Sirt1 by activating microRNA‑195 in human umbilical vein endothelial cells (HUVECs), as determined by western blot analysis in vivo and in vitro. Furthermore, a lower expression of Sirt1 was correlated with glucose metabolic abnormalities, aortic endothelial dysfunction and endothelial apoptosis as evidenced by western blot analysis and ELISA in mice. By contrast, the loss of Sirt1 evoked mitochondrial fission factor (Mff)‑mediated mitochondrial fission through the c‑Jun N‑terminal kinase (JNK) pathway, which contributes to the apoptosis of HUVECs. In addition, Sirt1 deficiency downregulated the migration of HUVECs through F‑actin dyshomeostasis. Collectively, the results identify Sirt1 as a protective factor, which inhibits the JNK/Mff/mitochondrial fission pathway and sustains F‑actin homeostasis, and has potential implications for novel approaches to diabetic vasculopathy.
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Affiliation(s)
- Ruijie Qin
- Department of Endocrinology, Beijing Hospital, National Center of Gerontology
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences
| | - Lina Zhang
- Department of Endocrinology, Beijing Hospital, National Center of Gerontology
| | - Dong Lin
- Department of Endocrinology, Beijing Hospital, National Center of Gerontology
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences
| | - Fei Xiao
- The MOH Key Laboratory of Geriatrics, Beijing Hospital, National Center of Gerontology, Beijing 100730, P.R. China
| | - Lixin Guo
- Department of Endocrinology, Beijing Hospital, National Center of Gerontology
- Graduate School of Peking Union Medical College and Chinese Academy of Medical Sciences
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