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      Low serum levels of bone turnover markers are associated with perirenal fat thickness in patients with type 2 diabetes mellitus

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          Abstract

          Background

          Obesity is known as a common risk factor for osteoporosis and type 2 diabetes mellitus (T2DM). Perirenal fat, surrounding the kidneys, has been reported to be unique in anatomy and biological functions. This study aimed to explore the relationship between perirenal fat and bone metabolism in patients with T2DM.

          Methods

          A total of 234 patients with T2DM were recruited from September 2019 to December 2019 in the cross-sectional study. The biochemical parameters and bone turnover markers (BTMs) were determined in all participants. Perirenal fat thickness (PrFT) was performed by ultrasounds via a duplex Doppler apparatus. Associations between PrFT and bone metabolism index were determined via correlation analysis and regression models.

          Results

          The PrFT was significantly correlated with β-C-terminal telopeptides of type I collagen (β-CTX) (r = −0.14, P < 0.036), parathyroid hormone (iPTH) (r = −0.18, P ≤ 0.006), and 25 hydroxyvitamin D (25-OH-D) (r = −0.14, P = 0.001). Multivariate analysis confirmed that the association of PrFT and β-CTX ( β = −0.136, P = 0.042) was independent of other variables.

          Conclusion

          This study showed a negative and independent association between PrFT and β-CTX in subjects with T2DM, suggesting a possible role of PrFT in bone metabolism. Follow-up studies and further research are necessary to validate the associations and to elucidate the underlying mechanisms.

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          Most cited references36

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          Mechanisms of disease: is osteoporosis the obesity of bone?

          Clifford Rosen, Mary Bouxsein (2006)
          Osteoporosis and obesity, two disorders of body composition, are growing in prevalence. Interestingly, these diseases share several features including a genetic predisposition and a common progenitor cell. With aging, the composition of bone marrow shifts to favor the presence of adipocytes, osteoclast activity increases, and osteoblast function declines, resulting in osteoporosis. Secondary causes of osteoporosis, including diabetes mellitus, glucocorticoids and immobility, are associated with bone-marrow adiposity. In this review, we ask a provocative question: does fat infiltration in the bone marrow cause low bone mass or is it a result of bone loss? Unraveling the interface between bone and fat at a molecular and cellular level is likely to lead to a better understanding of several diseases, and to the development of drugs for both osteoporosis and obesity.
          Article 0 comments Cited 239 times – based on 0 reviews     Review now
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            Leptin regulates bone formation via the sympathetic nervous system.

            Shu Takeda, Florent Elefteriou, Régis Levasseur … (2002)
            We previously showed that leptin inhibits bone formation by an undefined mechanism. Here, we show that hypothalamic leptin-dependent antiosteogenic and anorexigenic networks differ, and that the peripheral mediators of leptin antiosteogenic function appear to be neuronal. Neuropeptides mediating leptin anorexigenic function do not affect bone formation. Leptin deficiency results in low sympathetic tone, and genetic or pharmacological ablation of adrenergic signaling leads to a leptin-resistant high bone mass. beta-adrenergic receptors on osteoblasts regulate their proliferation, and a beta-adrenergic agonist decreases bone mass in leptin-deficient and wild-type mice while a beta-adrenergic antagonist increases bone mass in wild-type and ovariectomized mice. None of these manipulations affects body weight. This study demonstrates a leptin-dependent neuronal regulation of bone formation with potential therapeutic implications for osteoporosis.
            Article 0 comments Cited 154 times – based on 0 reviews     Review now
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              Biochemical markers of bone turnover, endogenous hormones and the risk of fractures in postmenopausal women: the OFELY study.

              P Garnero, E Sornay-Rendu, B Claustrat … (2000)
              The mechanisms leading to increased bone loss and skeletal fragility in women with postmenopausal osteoporosis are still poorly understood. Increased bone resorption, low serum estradiol and high serum sex-hormone-binding globulin (SHBG) recently have been reported as predictors of vertebral and hip fractures in elderly women. In a cohort of healthy untreated younger postmenopausal women aged 50-89 years (mean, 64 years), we compared baseline levels of bone markers and endogenous hormones in 55 women who subsequently had a fracture (20 vertebral and 35 peripheral fractures) with levels in the 380 women who did not fracture during a mean 5 years of follow-up. Women with levels in the highest quartile of four bone resorption markers including urinary-free deoxypyridinoline (D-Pyr), urinary type I collagen N-telopeptides (NTX), and urinary and serum type I collagen C-telopeptides (CTX) had about a 2-fold increased risk of fractures compared with women with levels in the three lowest quartiles with relative risk (RR) and 95% CI of 1.8 (1.0-3.4) for free D-Pyr, 1.7 (0.9-3.2) for urinary NTX, 2.3 (1.3-4.1) for urinary CTX, and 2.1 (1.2-3.8) for serum CTX. Serum levels of bone alkaline phosphatase (BAP) in the highest quartile were associated with an RR of fracture of 2.4 (1.3-4.2). Women with serum levels of estradiol and dehydroepiandrosterone (DHEA) sulfate in the lowest quartile had an RR of fracture of 2.2 (1.2-4.0) and 2.1 (1.2-3.8), respectively. Increased levels of SHBG and intact parathyroid hormone (PTH) were moderately associated with an increased risk of fracture. Similar results were obtained when the analysis was restricted to symptomatic vertebral and nonvertebral fractures. Adjustment of biochemical markers by hormone levels did not significantly alter the results. Women with both high bone resorption markers and low estradiol (or low DHEA sulfate) had a higher risk of fracture with RRs of 3.0-3.3 (p < 0.001). After adjustment for bone mineral density (BMD) of the hip, spine, radius, or total body, bone markers and hormones were still predictive of fracture risk with similar RRs. We conclude that high levels of some biochemical markers of bone turnover, low serum estradiol, low DHEA sulfate, high SHBG, and high PTH are associated with increased risk of osteoporotic fracture in postmenopausal women, independently of each other and of BMD. The mechanism by which some postmenopausal women have an increased rate of bone turnover leading to an increased risk of fracture remains to be elucidated.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Endocr Connect
                Journal ID (iso-abbrev): Endocr Connect
                Journal ID (hwp): EC
                Title: Endocrine Connections
                Publisher: Bioscientifica Ltd (Bristol )
                ISSN (Electronic): 2049-3614
                Publication date (Electronic): 17 September 2021
                Publication date Collection: 01 October 2021
                Volume: 10
                Issue: 10
                Pages: 1337-1343
                Affiliations
                [1 ]Center for Metabolism and Immune Diseases, Beijing Luhe Hospital, Capital Medical University , Beijing, China
                [2 ]Beijing Key Laboratory of Diabetes Research and Care , Beijing, China
                Author notes
                Correspondence should be addressed to J Ke: kejing@ 123456ccmu.edu.cn
                Article
                Publisher ID: EC-21-0449
                DOI: 10.1530/EC-21-0449
                PMC ID: 8558911
                PubMed ID: 34533475
                SO-VID: b8b19823-8135-4027-9bab-25083eb2e426
                Copyright © © The authors
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                Date received : 07 September 2021
                Date accepted : 17 September 2021
                Categories
                Subject: Research

                Keywords: perirenal fat thickness,β-c-terminal telopeptides of type i collagen,bone metabolism,type 2 diabetes
                Data availability:
                Keywords: perirenal fat thickness, β-c-terminal telopeptides of type i collagen, bone metabolism, type 2 diabetes

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