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Condi FLDF, Fuchs LFP, Carvalho KC, Baracat EC. Treatment with Raloxifene Induces the Expression of Kisspeptin, Insulin, and Androgen Receptors in Bones of Castrated Adult Female Rats. Rev Bras Ortop 2024; 59:e228-e234. [PMID: 38606141 PMCID: PMC11006519 DOI: 10.1055/s-0044-1779319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 06/26/2023] [Indexed: 04/13/2024] Open
Abstract
Objective To evaluate the effects of estrogen, raloxifene and genistein on the expression of KISS1 (kisspeptin), KISS1R (kisspeptin receptor), AR (androgen receptor) and INSR (insulin receptor) in the bones of ovariectomized rats. Methods Forty-eight adult rats were randomly divided into 6 groups, containing 8 animals each: G1-nonovariectomized control; G2-ovariectomized and treated with conjugated equine estrogens (50 µg/Kg/day); G3-ovariectomized and treated with raloxifene (0.75 mg/kg/day); G4-ovariectomized animal that received soy extract with genistein (300 mg/kg/day); G5-ovariectomized animal that received estrogen and genistein; and G6-ovariectomized animal that received estrogen and raloxifene. Three months after surgery, the castrated animals received the drugs orally daily for 120 days. All animals were sacrificed after this period, by deepening the anesthesia. The left tibia was removed for total RNA extraction and analysis of gene expression of KISS1 , KISS1R , AR and INSR , by quantitative real-time polymerase chain reaction (qRT-PCR). Results KISS1 was not detected in any of the treated groups. KISS1R , INSR and AR showed higher expression in the G3 group ( p < 0.001), while lower levels of transcripts for these genes were observed in G4 and G5. G2 animals showed hypoexpression of the evaluated genes. Conclusion The results indicate that raloxifene, alone or combined with estrogen, was able to induce the expression of genes associated with the recovery of bone tissue homeostasis in ovariectomized rats.
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Affiliation(s)
| | - Luiz Fernando Portugal Fuchs
- Departamento de Ginecologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brasil
| | - Katia Candido Carvalho
- Laboratório de Ginecologia Estrutural e Molecular (LIM 58), Disciplina de Ginecologia, Departamento de Obstetrícia e Ginecologia, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo (HCFMUSP), São Paulo, SP, Brasil
| | - Edmund Chada Baracat
- Laboratório de Ginecologia Estrutural e Molecular (LIM 58), Disciplina de Ginecologia, Departamento de Obstetrícia e Ginecologia, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo (HCFMUSP), São Paulo, SP, Brasil
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Dickerson B, Maury J, Jenkins V, Nottingham K, Xing D, Gonzalez DE, Leonard M, Kendra J, Ko J, Yoo C, Johnson S, Pradelles R, Purpura M, Jäger R, Sowinski R, Rasmussen CJ, Kreider RB. Effects of Supplementation with Microalgae Extract from Phaeodactylum tricornutum (Mi136) to Support Benefits from a Weight Management Intervention in Overweight Women. Nutrients 2024; 16:990. [PMID: 38613023 PMCID: PMC11013338 DOI: 10.3390/nu16070990] [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: 03/14/2024] [Revised: 03/23/2024] [Accepted: 03/26/2024] [Indexed: 04/14/2024] Open
Abstract
BACKGROUND Microalgae like Phaeodactylum tricornutum (PT) contain the carotenoid, fucoxanthin, which has been purported to promote fat loss, lower blood lipids, and improve glucose management. This study examined whether dietary supplementation with microalgae extracts from PT containing 4.4 mg/d of fucoxanthin affects changes in body composition or health markers in overweight women during an exercise and diet intervention. MATERIALS AND METHODS A total of 37 females (28.6 ± 7.9 years, 80.2 ± 14.9 kg, 29.6 ± 3.8 kg/m², 41.4 ± 4.2% fat) fasted for 12 h, donated a fasting blood sample, completed health and mood state inventories, and undertook body composition, health, and exercise assessments. In a counterbalanced, randomized, and double-blind manner, participants ingested a placebo (PL), or microalgae extract of Phaeodactylum tricornutum standardized to 4.4 mg of fucoxanthin (FX) for 12 weeks while participating in a supervised exercise program that included resistance-training and walking (3 days/week) with encouragement to accumulate 10,000 steps/day on remaining days of the week. The diet intervention involved reducing energy intake by about -300 kcal/d (i.e., ≈1400-1600 kcals/d, 55% carbohydrate, 30% fat, 15% protein) to promote a -500 kcal/d energy deficit with exercise. Follow-up testing was performed at 6 and 12 weeks. A general linear model (GLM) with repeated measures statistical analysis was used to analyze group responses and changes from baseline with 95% confidence intervals. RESULTS Dietary supplementation with microalgae extract from PT containing fucoxanthin for 12 weeks did not promote additional weight loss or fat loss in overweight but otherwise healthy females initiating an exercise and diet intervention designed to promote modest weight loss. However, fucoxanthin supplementation preserved bone mass, increased bone density, and saw greater improvements in walking steps/day, resting heart rate, aerobic capacity, blood lipid profiles, adherence to diet goals, functional activity tolerance, and measures of quality of life. Consequently, there appears to be some benefit to supplementing microalgae extract from PT containing fucoxanthin during a diet and exercise program. Registered clinical trial #NCT04761406.
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Affiliation(s)
- Broderick Dickerson
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Jonathan Maury
- Research & Development Department, Microphyt, 34670 Baillargues, France; (J.M.); (R.P.)
| | - Victoria Jenkins
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Kay Nottingham
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Dante Xing
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Drew E. Gonzalez
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Megan Leonard
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Jacob Kendra
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Joungbo Ko
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Choongsung Yoo
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Sarah Johnson
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Rémi Pradelles
- Research & Development Department, Microphyt, 34670 Baillargues, France; (J.M.); (R.P.)
| | - Martin Purpura
- Increnovo LLC, Whitefish Bay, WI 53217, USA; (M.P.); (R.J.)
| | - Ralf Jäger
- Increnovo LLC, Whitefish Bay, WI 53217, USA; (M.P.); (R.J.)
| | - Ryan Sowinski
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Christopher J. Rasmussen
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
| | - Richard B. Kreider
- Exercise & Sport Nutrition Laboratory, Department of Kinesiology and Sports Management, Texas A&M University, College Station, TX 77843, USA; (B.D.); (V.J.); (K.N.); (D.X.); (D.E.G.); (M.L.); (J.K.); (J.K.); (C.Y.); (S.J.); (R.S.); (C.J.R.)
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Milluzzo A, Barchitta M, Maugeri A, Agodi A, Sciacca L. Body Mass Index is related to short-term retinal worsening in type 2 diabetes mellitus patients treated with anticancer drugs. Minerva Endocrinol (Torino) 2024; 49:76-84. [PMID: 35103455 DOI: 10.23736/s2724-6507.22.03653-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
BACKGROUND In cancer patients with diabetes, anticancer drugs (ADs) may negatively affect the course of diabetes vascular complications. The short-term effects of ADs on type 2 diabetes (T2DM) retinopathy are poorly known. This study evaluated the short-term effects of different classes of ADs on diabetic retinopathy (DR) and clinical risk factors for retinal worsening (RW) in cancer patients affected by T2DM. METHODS Retrospective single-center study evaluating 168 patients with T2DM and cancer. The diagnosis of T2DM preceded those of cancer in all patients. We evaluated the retinal short-term effects within the six months after the first-line ADs treatment. RESULTS After ADs, 6% of patients had a short-term RW. BMI is positively associated with the risk of RW (OR 1.45, 95% confidence interval: 1.1-1.9, P<0.005). Patients treated with alkylating agents and topoisomerase inhibitors have an increased risk of RW (P=0.049 and P=0.057, respectively) and a significantly higher HDL level (P<0.01). CONCLUSIONS To our knowledge, this study is the first investigating the short-term impact of ADs on DR of T2DM patients. Moreover, we provide information arose from a real-world setting. As confirmed by other studies, these findings could help to identify patients at risk for short-term RW, who should be promptly referred to the ophthalmologist for the prevention of visual impairment.
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Affiliation(s)
- Agostino Milluzzo
- Section of Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy -
| | - Martina Barchitta
- Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Catania, Italy
| | - Andrea Maugeri
- Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Catania, Italy
| | - Antonella Agodi
- Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Catania, Italy
| | - Laura Sciacca
- Section of Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
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Mills EG, Abbara A, Dhillo WS, Comninos AN. Effects of distinct Polycystic Ovary Syndrome phenotypes on bone health. Front Endocrinol (Lausanne) 2023; 14:1163771. [PMID: 37251667 PMCID: PMC10213631 DOI: 10.3389/fendo.2023.1163771] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 05/02/2023] [Indexed: 05/31/2023] Open
Abstract
Polycystic Ovary Syndrome (PCOS) is a highly prevalent and heterogenous endocrinopathy affecting 5-18% of women. Although its cardinal features include androgen excess, ovulatory dysfunction, and/or polycystic ovarian morphology, women often display related metabolic manifestations, including hyperinsulinaemia, insulin resistance, and obesity. Emerging data reveal that the hormonal alterations associated with PCOS also impact bone metabolism. However, inconsistent evidence exists as to whether PCOS is a bone-protective or bone-hindering disorder with an accumulating body of clinical data indicating that hyperandrogenism, hyperinsulinaemia, insulin resistance, and obesity may have a relative protective influence on bone, whereas chronic low-grade inflammation and vitamin D deficiency may adversely affect bone health. Herein, we provide a comprehensive assessment of the endocrine and metabolic manifestations associated with PCOS and their relative effects on bone metabolism. We focus principally on clinical studies in women investigating their contribution to the alterations in bone turnover markers, bone mineral density, and ultimately fracture risk in PCOS. A thorough understanding in this regard will indicate whether women with PCOS require enhanced surveillance of bone health in routine clinical practice.
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Affiliation(s)
- Edouard G. Mills
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare NHS Trust, London, United Kingdom
| | - Ali Abbara
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare NHS Trust, London, United Kingdom
| | - Waljit S. Dhillo
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare NHS Trust, London, United Kingdom
| | - Alexander N. Comninos
- Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
- Department of Endocrinology, Imperial College Healthcare NHS Trust, London, United Kingdom
- Endocrine Bone Unit, Imperial College Healthcare NHS Trust, London, United Kingdom
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Tian Y, Ming J. Melatonin inhibits osteoclastogenesis via RANKL/OPG suppression mediated by Rev-Erbα in osteoblasts. J Cell Mol Med 2022; 26:4032-4047. [PMID: 35726597 PMCID: PMC9279587 DOI: 10.1111/jcmm.17440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 05/21/2022] [Accepted: 05/27/2022] [Indexed: 12/11/2022] Open
Abstract
Diabetic osteoporosis is secondary osteoporosis and a serious complication of diabetes with a high incidence rate and poor prognosis. The specific mechanism of diabetic osteoporosis is unclear, and prevention and treatment options are limited. Recently, melatonin has been found to prevent and treat diabetic osteoporosis. Herein, we investigated the mechanism whereby melatonin inhibits osteoclastogenesis and identified a new target for osteoporosis treatment. We established an in vitro osteoblast–osteoclast co‐culture system as a diabetic osteoporosis model. Osteoclastogenesis was determined using tartrate‐resistant acid phosphatase staining and cathepsin K expression. Real‐time PCR was used to ascertain expression of microRNA mir‐882, targeting Rev‐Erbα. Western blotting was performed to detect the expression of Rev‐Erbα, receptor activator of NF‐kB ligand (RANKL), and osteoprotegerin (OPG), and ELISA was utilized to analyse the secreted form of RANKL. High glucose promoted osteoclastogenesis and elevated the RANKL/OPG ratio in osteoblasts, while melatonin reversed these effects. High glucose inhibited Rev‐Erbα expression, while melatonin promoted its expression. Conversely, high glucose promoted mir‐882 expression, while melatonin inhibited it. We infer that melatonin inhibits RANKL expression in osteoblasts via the mir‐882/Rev‐Erbα axis, thus inhibiting osteoclastogenesis. Our findings provide insights into diabetic osteoporosis and identify a new therapeutic target for osteoporosis.
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Affiliation(s)
- Yihao Tian
- Department of Pathology, General Hospital of Northern Theater Command, Shenyang, China
| | - Jian Ming
- Department of Pathology, General Hospital of Northern Theater Command, Shenyang, China
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Suzuki M, Urai S, Fukuoka H, Hirota Y, Yamamoto M, Okada Y, Yamamoto N, Shichi H, Fujita Y, Kanie K, Iguchi G, Takahashi Y, Ogawa W. Relation between the insulin lowering rate and changes in bone mineral density: Analysis among subtypes of type 1 diabetes mellitus. J Diabetes Investig 2022; 13:1585-1595. [PMID: 35470583 PMCID: PMC9434576 DOI: 10.1111/jdi.13817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 04/03/2022] [Indexed: 11/28/2022] Open
Abstract
AIMS/INTRODUCTION Bone mineral density (BMD) in patients with type 1 diabetes mellitus (T1DM) is reduced due to impaired insulin secretion. However, it is unclear whether the rate of BMD reduction is affected by T1DM subtypes. This study aimed to clarify the difference in BMD across T1DM subtypes: slowly progressive (SP), acute-onset (AO), and fulminant (F). METHODS This was a retrospective, single-center, cross-sectional study conducted on 98 adult T1DM patients. The main outcome included the BMD Z-score (BMD-Z) measured at the lumbar spine (LS) and femoral neck (FN). RESULTS The LS BMD-Z was lower in the AO than in the SP (p =0.03). No differences were observed when compared to the F. The FN BMD-Z tended to be higher in the SP than in the AO and F. Multiple regression analyses showed that the LS BMD-Z was associated with subtypes (AO vs. SP) (p =0.01), but not subtypes (F vs. SP), adjusted for sex, duration, retinopathy, and C-peptide immunoreactivity (CPR). When patients were divided into disease duration tertiles, in the first and second tertiles, the CPR levels were lower in the AO or F than in the SP. In contrast, LS and FN BMD-Z differed between the AO and SP only in the second tertiles (both p <0.01), with a similar tendency between the F and SP. CONCLUSIONS Among T1DM subtypes, BMD has time-dependent changes, which reveals that BMD decline follows impaired insulin secretion. These results provide novel insights into the association between the low insulin exposure duration and BMD.
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Affiliation(s)
- Masaki Suzuki
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Shin Urai
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hidenori Fukuoka
- Division of Diabetes and Endocrinology, Kobe University Hospital, Kobe, Japan
| | - Yushi Hirota
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Masaaki Yamamoto
- Division of Diabetes and Endocrinology, Kobe University Hospital, Kobe, Japan
| | - Yuko Okada
- Division of Diabetes and Endocrinology, Kobe University Hospital, Kobe, Japan
| | - Naoki Yamamoto
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Hiroki Shichi
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Yasunori Fujita
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Keitaro Kanie
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Genzo Iguchi
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan.,Medical Center for Student Health, Kobe University, Kobe, Japan.,Division of Biosignal Pathophysiology, Kobe University, Kobe, Japan
| | - Yutaka Takahashi
- Department of Diabetes and Endocrinology, Nara Medical University, Kashihara, Japan
| | - Wataru Ogawa
- Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
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Avilkina V, Chauveau C, Ghali Mhenni O. Sirtuin function and metabolism: Role in pancreas, liver, and adipose tissue and their crosstalk impacting bone homeostasis. Bone 2022; 154:116232. [PMID: 34678494 DOI: 10.1016/j.bone.2021.116232] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 10/07/2021] [Accepted: 10/08/2021] [Indexed: 12/12/2022]
Abstract
Mammalian sirtuins (SIRT1-7) are members of the nicotine adenine dinucleotide (NAD+)-dependent family of enzymes critical for histone deacetylation and posttranslational modification of proteins. Sirtuin family members regulate a wide spectrum of biological processes and are best known for maintaining longevity. Sirtuins are well characterized in metabolic tissues such as the pancreas, liver and adipose tissue (AT). They are regulated by a diverse range of stimuli, including nutrients and metabolic changes within the organism. Indeed, nutrient-associated conditions, such as obesity and anorexia nervosa (AN), were found to be associated with bone fragility development in osteoporosis. Interestingly, it has also been demonstrated that sirtuins, more specifically SIRT1, can regulate bone activity. Various studies have demonstrated the importance of sirtuins in bone in the regulation of bone homeostasis and maintenance of the balance between bone resorption and bone formation. However, to understand the molecular mechanisms involved in the negative regulation of bone homeostasis during overnutrition (obesity) or undernutrition, it is crucial to examine a wider picture and to determine the pancreatic, liver and adipose tissue pathway crosstalk responsible for bone loss. Particularly, under AN conditions, sirtuin family members are highly expressed in metabolic tissue, but this phenomenon is reversed in bone, and severe bone loss has been observed in human subjects. AN-associated bone loss may be connected to SIRT1 deficiency; however, additional factors may interfere with bone homeostasis. Thus, in this review, we focus on sirtuin activity in the pancreas, liver and AT in cases of over- and undernutrition, especially the regulation of their secretome by sirtuins. Furthermore, we examine how the secretome of the pancreas, liver and AT affects bone homeostasis, focusing on undernutrition. This review aims to lead to a better understanding of the crosstalk between sirtuins, metabolic organs and bone. In long term prospective it should contribute to promote improvement of therapeutic strategies for the prevention of metabolic diseases and the development of osteoporosis.
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Affiliation(s)
- Viktorija Avilkina
- Marrow Adiposity and Bone Lab (MABLab) ULR4490, Univ. Littoral Côte d'Opale, F-62200, Boulogne-sur-Mer, Univ. Lille F-59000 Lille, CHU Lille, F-59000 Lille, France
| | - Christophe Chauveau
- Marrow Adiposity and Bone Lab (MABLab) ULR4490, Univ. Littoral Côte d'Opale, F-62200, Boulogne-sur-Mer, Univ. Lille F-59000 Lille, CHU Lille, F-59000 Lille, France
| | - Olfa Ghali Mhenni
- Marrow Adiposity and Bone Lab (MABLab) ULR4490, Univ. Littoral Côte d'Opale, F-62200, Boulogne-sur-Mer, Univ. Lille F-59000 Lille, CHU Lille, F-59000 Lille, France.
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Insulin Receptor Isoforms Differently Regulate Cell Proliferation and Apoptosis in the Ligand-Occupied and Unoccupied State. Int J Mol Sci 2021; 22:ijms22168729. [PMID: 34445431 PMCID: PMC8395753 DOI: 10.3390/ijms22168729] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 08/04/2021] [Accepted: 08/10/2021] [Indexed: 12/17/2022] Open
Abstract
The insulin receptor (IR) presents two isoforms (IR-A and IR-B) that differ for the α-subunit C-terminal. Both isoforms are expressed in all human cells albeit in different proportions, yet their functional properties-when bound or unbound to insulin-are not well characterized. From a cell model deprived of the Insulin-like Growth Factor 1 Receptor (IGF1-R) we therefore generated cells exhibiting no IR (R-shIR cells), or only human IR-A (R-shIR-A), or exclusively human IR-B (R-shIR-B) and we studied the specific effect of the two isoforms on cell proliferation and cell apoptosis. In the absence of insulin both IR-A and IR-B similarly inhibited proliferation but IR-B was 2–3 fold more effective than IR-A in reducing resistance to etoposide-induced DNA damage. In the presence of insulin, IR-A and IR-B promoted proliferation with the former significantly more effective than the latter at increasing insulin concentrations. Moreover, only insulin-bound IR-A, but not IR-B, protected cells from etoposide-induced cytotoxicity. In conclusion, IR isoforms have different effects on cell proliferation and survival. When unoccupied, IR-A, which is predominantly expressed in undifferentiated and neoplastic cells, is less effective than IR-B in protecting cells from DNA damage. In the presence of insulin, particularly when present at high levels, IR-A provides a selective growth advantage.
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Abstract
UNLABELLED Insulin resistance may be linked to bone health in young people. This study is the first on adolescents that jointly examined the association of bone health with insulin resistance and body composition. Our results revealed significant negative association between bone parameters and insulin resistance, even after adjustment for confounding factors. PURPOSE Previous studies are suggestive of the protective role of insulin on bone in adults. Whether this association exists in younger individuals is not clear, yet. This investigation aimed to evaluate the association between insulin resistance, bone parameters, and body composition amongst Iranian adolescents᾽ population. METHODS A cross-sectional study was conducted on 423 participants (224 girls and 199 boys) aged 9-19 years old. Insulin resistance was assessed, using a homeostatic model assessment of insulin resistance (HOMA-IR) and quantitative insulin sensitivity check index (QUICKI). Bone mineral density (BMD), bone mineral content (BMC), total body fat mass (TBFM), and total body lean mass (TBLM) were measured, using dual energy X-ray absorptiometry (DXA), and bone mineral apparent density (BMAD) was calculated. RESULTS In multiple regression analyses adjusted for potential confounders, the HOMA-IR showed statistically significant negative association with most of the bone parameters (β = - 1.1 to - 0.002, P = 0.004 to 0.036). On the subject of QUICKI index, this relationship was detected only for lumbar spine (LS) parameters (β = 0.062 to 37.21, P = 0.0001 to 0.026) and femoral neck bone mineral content (FNBMC) (β = 1.297, P = 0.013). CONCLUSION Our results suggest that insulin resistance may be inversely and independently associated with the bone indices in younger individuals. Whether high insulin levels have detrimental effects on growing bone is still unclear and has to be answered.
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Vella V, Malaguarnera R, Nicolosi ML, Morrione A, Belfiore A. Insulin/IGF signaling and discoidin domain receptors: An emerging functional connection. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2019; 1866:118522. [PMID: 31394114 DOI: 10.1016/j.bbamcr.2019.118522] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 12/28/2022]
Abstract
The insulin/insulin-like growth factor system (IIGFs) plays a fundamental role in the regulation of prenatal and postnatal growth, metabolism and homeostasis. As a consequence, dysregulation of this axis is associated with growth disturbance, type 2 diabetes, chronic inflammation and tumor progression. A functional crosstalk between IIGFs and discoidin domain receptors (DDRs) has been recently discovered. DDRs are non-integrin collagen receptors that canonically undergo slow and long-lasting autophosphorylation after binding to fibrillar collagen. While both DDR1 and DDR2 functionally interact with IIGFs, the crosstalk with DDR1 is so far better characterized. Notably, the IIGFs-DDR1 crosstalk presents a feed-forward mechanism, which does not require collagen binding, thus identifying novel non-canonical action of DDR1. Further studies are needed to fully explore the role of this IIGFs-DDRs functional loop as potential target in the treatment of inflammatory and neoplastic disorders.
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Affiliation(s)
- Veronica Vella
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Hospital, Catania, Italy
| | | | - Maria Luisa Nicolosi
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Hospital, Catania, Italy
| | - Andrea Morrione
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA, USA
| | - Antonino Belfiore
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Hospital, Catania, Italy.
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11
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Wang C, Li X, Dang H, Liu P, Zhang BO, Xu F. Insulin-like growth factor 2 regulates the proliferation and differentiation of rat adipose-derived stromal cells via IGF-1R and IR. Cytotherapy 2019; 21:619-630. [PMID: 30956007 DOI: 10.1016/j.jcyt.2018.11.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/20/2018] [Accepted: 11/20/2018] [Indexed: 01/22/2023]
Abstract
BACKGROUND Insulin-like growth factor 2 (IGF2), an essential component of the stem cell niche, has been reported to modulate the proliferation and differentiation of stem cells. Previously, a continuous expression of IGF2 in tissues was reported to maintain the self-renewal ability of several types of stem cells. Therefore, in this study, we investigated the expression of IGF2 in adipose tissues and explored the effects of IGF2 on adipose-derived stromal cells (ADSCs) in vitro. METHODS The expression pattern of IGF2 in rat adipose tissues was determined by gene expression and protein analyses. The effect of IGF2 on proliferation, stemness-related marker expression and adipogenic and osteogenic differentiation was systematically investigated. Furthermore, antagonists of IGF2-specific receptors-namely, BMS-754807 and picropodophyllin-were added to explore the underlying signal transduction mechanisms. RESULTS IGF2 levels displayed a tendency to decrease with age in rat adipose tissues. After the addition of IGF2, isolated ADSCs displayed higher proliferation and expression of the stemness-related markers NANOG, OCT4 and SOX2 and greater differentiation potential to adipocytes and osteoblasts. Additionally, both type 1 insulin-like growth factor receptor (IGF-1R) and insulin receptor (IR) participated in the IGF2-mediated promotion of stemness in ADSCs. CONCLUSIONS Our findings indicate that IGF2 could enhance the stemness of rat ADSCs via IGF-1R and IR and may highlight an effective method for the expansion of ADSCs for clinical application.
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Affiliation(s)
- Chao Wang
- Department of Pediatric Intensive Care Unit, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014 China; China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014 China; Chongqing Engineering Research Center of Stem Cell Therapy, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaoming Li
- State Key Lab of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - Hongxing Dang
- Department of Pediatric Intensive Care Unit, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014 China; China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014 China; Chongqing Engineering Research Center of Stem Cell Therapy, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Ping Liu
- State Key Lab of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - B O Zhang
- State Key Lab of Trauma, Burns and Combined Injury, Institute of Surgery Research, Daping Hospital, Army Medical University, Chongqing 400042, China
| | - Feng Xu
- Department of Pediatric Intensive Care Unit, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, 400014 China; China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Chongqing, 400014 China; Chongqing Engineering Research Center of Stem Cell Therapy, Children's Hospital of Chongqing Medical University, Chongqing, China.
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12
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The Emerging Role of Insulin Receptor Isoforms in Thyroid Cancer: Clinical Implications and New Perspectives. Int J Mol Sci 2018; 19:ijms19123814. [PMID: 30513575 PMCID: PMC6321330 DOI: 10.3390/ijms19123814] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 11/26/2018] [Accepted: 11/28/2018] [Indexed: 12/28/2022] Open
Abstract
Thyroid cancer (TC) is the most common endocrine tumor. Although the majority of TCs show good prognoses, a minor proportion are aggressive and refractory to conventional therapies. So far, the molecular mechanisms underlying TC pathogenesis are incompletely understood. Evidence suggests that TC cells and their precursors are responsive to insulin and insulin-like growth factors (IGFs), and often overexpress receptors for insulin (IR) and IGF-1 (IGF-1R). IR exists in two isoforms, namely IR-A and IR-B. The first binds insulin and IGF-2, unlike IR-B, which only binds insulin. IR-A is preferentially expressed in prenatal life and contributes to development through IGF-2 action. Aggressive TC overexpresses IR-A, IGF-2, and IGF-1R. The over-activation of IR-A/IGF-2 loop in TC is associated with stem-like features and refractoriness to some targeted therapies. Importantly, both IR isoforms crosstalk with IGF-1R, giving rise to the formation of hybrids receptors (HR-A or HR-B). Other interactions have been demonstrated with other molecules such as the non-integrin collagen receptor, discoidin domain receptor 1 (DDR1), and the receptor for the hepatocyte growth factor (HGF), Met. These functional networks provide mechanisms for IR signaling diversification, which may also exert a role in TC stem cell biology, thereby contributing to TC initiation and progression. This review focuses on the molecular mechanisms by which deregulated IR isoforms and their crosstalk with other molecules and signaling pathways in TC cells and their precursors may contribute to thyroid carcinogenesis, progression, and resistance to conventional treatments. We also highlight how targeting these alterations starting from TC progenitors cells may represent new therapeutic strategies to improve the clinical management of advanced TCs.
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Vella V, Milluzzo A, Scalisi NM, Vigneri P, Sciacca L. Insulin Receptor Isoforms in Cancer. Int J Mol Sci 2018; 19:ijms19113615. [PMID: 30453495 PMCID: PMC6274710 DOI: 10.3390/ijms19113615] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/05/2018] [Accepted: 11/13/2018] [Indexed: 12/17/2022] Open
Abstract
The insulin receptor (IR) mediates both metabolic and mitogenic effects especially when overexpressed or in clinical conditions with compensatory hyperinsulinemia, due to the metabolic pathway resistance, as obesity diabetes. In many cancers, IR is overexpressed preferentially as IR-A isoform, derived by alternative splicing of exon 11. The IR-A overexpression, and the increased IR-A:IR-B ratio, are mechanisms that promote the mitogenic response of cancer cells to insulin and IGF-2, which is produced locally by both epithelial and stromal cancer cells. In cancer IR-A, isoform predominance may occur for dysregulation at both mRNA transcription and post-transcription levels, including splicing factors, non-coding RNAs and protein degradation. The mechanisms that regulate IR isoform expression are complex and not fully understood. The IR isoform overexpression may play a role in cancer cell stemness, in tumor progression and in resistance to target therapies. From a clinical point of view, the IR-A overexpression in cancer may be a determinant factor for the resistance to IGF-1R target therapies for this issue. IR isoform expression in cancers may have the meaning of a predictive biomarker and co-targeting IGF-1R and IR-A may represent a new more efficacious treatment strategy.
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Affiliation(s)
- Veronica Vella
- Department of Clinical and Experimental Medicine, Endocrinology Section, University of Catania Medical School, Garibaldi-Nesima Hospital, via Palermo 636, 95122 Catania, Italy.
- School of Human and Social Science, University "Kore" of Enna, 94100 Enna, Italy.
| | - Agostino Milluzzo
- Department of Clinical and Experimental Medicine, Endocrinology Section, University of Catania Medical School, Garibaldi-Nesima Hospital, via Palermo 636, 95122 Catania, Italy.
| | - Nunzio Massimo Scalisi
- Department of Clinical and Experimental Medicine, Endocrinology Section, University of Catania Medical School, Garibaldi-Nesima Hospital, via Palermo 636, 95122 Catania, Italy.
| | - Paolo Vigneri
- Department of Clinical and Experimental Medicine, University of Catania Medical School, Center of Experimental Oncology and Hematology, A.O.U. Policlinico Vittorio Emanuele, via Santa Sofia, 78, 95123 Catania, Italy.
| | - Laura Sciacca
- Department of Clinical and Experimental Medicine, Endocrinology Section, University of Catania Medical School, Garibaldi-Nesima Hospital, via Palermo 636, 95122 Catania, Italy.
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14
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Belfiore A, Malaguarnera R, Vella V, Lawrence MC, Sciacca L, Frasca F, Morrione A, Vigneri R. Insulin Receptor Isoforms in Physiology and Disease: An Updated View. Endocr Rev 2017; 38:379-431. [PMID: 28973479 PMCID: PMC5629070 DOI: 10.1210/er.2017-00073] [Citation(s) in RCA: 234] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/13/2017] [Indexed: 02/08/2023]
Abstract
The insulin receptor (IR) gene undergoes differential splicing that generates two IR isoforms, IR-A and IR-B. The physiological roles of IR isoforms are incompletely understood and appear to be determined by their different binding affinities for insulin-like growth factors (IGFs), particularly for IGF-2. Predominant roles of IR-A in prenatal growth and development and of IR-B in metabolic regulation are well established. However, emerging evidence indicates that the differential expression of IR isoforms may also help explain the diversification of insulin and IGF signaling and actions in various organs and tissues by involving not only different ligand-binding affinities but also different membrane partitioning and trafficking and possibly different abilities to interact with a variety of molecular partners. Of note, dysregulation of the IR-A/IR-B ratio is associated with insulin resistance, aging, and increased proliferative activity of normal and neoplastic tissues and appears to sustain detrimental effects. This review discusses novel information that has generated remarkable progress in our understanding of the physiology of IR isoforms and their role in disease. We also focus on novel IR ligands and modulators that should now be considered as an important strategy for better and safer treatment of diabetes and cancer and possibly other IR-related diseases.
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Affiliation(s)
- Antonino Belfiore
- Endocrinology, Department of Health Sciences, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Roberta Malaguarnera
- Endocrinology, Department of Health Sciences, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy
| | - Veronica Vella
- School of Human and Social Sciences, University Kore of Enna, via della Cooperazione, 94100 Enna, Italy
| | - Michael C. Lawrence
- Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
- Department of Medical Biology, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Laura Sciacca
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Hospital, 95122 Catania, Italy
| | - Francesco Frasca
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Hospital, 95122 Catania, Italy
| | - Andrea Morrione
- Department of Urology and Biology of Prostate Cancer Program, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Riccardo Vigneri
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Hospital, 95122 Catania, Italy
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15
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Regulation of Osteogenic Differentiation of Placental-Derived Mesenchymal Stem Cells by Insulin-Like Growth Factors and Low Oxygen Tension. Stem Cells Int 2017; 2017:4576327. [PMID: 29138637 PMCID: PMC5613461 DOI: 10.1155/2017/4576327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 07/20/2017] [Indexed: 01/20/2023] Open
Abstract
Placental mesenchymal stem cells (PMSCs) are multipotent cells that can differentiate in vitro to multiple lineages, including bone. Insulin-like growth factors (IGFs, IGF-1 and IGF-2) participate in maintaining growth, survival, and differentiation of many stem cells, including osteoprogenitors. Low oxygen tension (PO2) can maintain stem cell multipotency and impede osteogenic differentiation. In this study, we investigated whether PMSC osteogenic differentiation is influenced by low PO2 and by IGFs. Our results indicated that low PO2 decreased osteogenic markers RUNX2 and OPN; however, re-exposure to higher oxygen tension (room air) restored differentiation. IGFs, especially IGF-1, triggered an earlier expression of RUNX2 and enhanced OPN and mineralization. RUNX2 was phosphorylated in room air and augmented by IGFs. IGF-1 receptor (IGF-1R) was increased in low PO2 and reduced by IGFs, while insulin receptor (IR) was increased in differentiating PMSCs and enhanced by IGF-1. Low PO2 and IGFs maintained higher IR-A which was switched to IR-B in room air. PI3K/AKT was required for osteogenic differentiation, while MEK/ERK was required to repress an RUNX2 and OPN increase in low PO2. Therefore, IGFs, specifically IGF-1, trigger the earlier onset of osteogenic differentiation in room air, whereas, reversibly, low PO2 impedes complete differentiation by maintaining higher multipotency and lower differentiation markers.
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16
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Cortini M, Avnet S, Baldini N. Mesenchymal stroma: Role in osteosarcoma progression. Cancer Lett 2017; 405:90-99. [PMID: 28774797 DOI: 10.1016/j.canlet.2017.07.024] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/19/2017] [Accepted: 07/23/2017] [Indexed: 12/21/2022]
Abstract
The initiation and progression of malignant tumors are supported by their microenvironment: cancer cells per se cannot explain growth and formation of the primary or metastasis, and a combination of proliferating tumor cells, cancer stem cells, immune cells mesenchymal stromal cells and/or cancer-associated fibroblasts all contribute to the tumor bulk. The interaction between these multiple players, under different microenvironmental conditions of biochemical and physical stimuli (i.e. oxygen tension, pH, matrix mechanics), regulates the production and biological activity of several soluble factors, extracellular matrix components, and extracellular vesicles that are needed for growth, maintenance, chemoresistance and metastatization of cancer. In osteosarcoma, a very aggressive cancer of young adults characterized by the extensive need for more effective therapies, this aspect has been only recently explored. In this view, we will discuss the role of stroma, with a particular focus on the mesenchymal stroma, contributing to osteosarcoma progression through inherent features for homing, neovascularization, paracrine cross-feeding, microvesicle secretion, and immune modulation, and also by responding to the changes of the microenvironment that are induced by tumor cells. The most recent advances in the molecular cues triggered by cytokines, soluble factors, and metabolites that are partially beginning to unravel the axis between stromal elements of mesenchymal origin and osteosarcoma cells, will be reviewed providing insights likely to be used for novel therapeutic approaches against sarcomas.
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Affiliation(s)
- Margherita Cortini
- Orthopaedic Pathophysiology and Regenerative Medicine Unit, Istituto Ortopedico Rizzoli, Bologna, Italy; Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Sofia Avnet
- Orthopaedic Pathophysiology and Regenerative Medicine Unit, Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Nicola Baldini
- Orthopaedic Pathophysiology and Regenerative Medicine Unit, Istituto Ortopedico Rizzoli, Bologna, Italy; Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy.
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17
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Torres-Costoso A, Pozuelo-Carrascosa DP, Álvarez-Bueno C, Ferri-Morales A, Miota Ibarra J, Notario-Pacheco B, Martínez-Vizcaíno V. Insulin and bone health in young adults: The mediator role of lean mass. PLoS One 2017; 12:e0173874. [PMID: 28323845 PMCID: PMC5360249 DOI: 10.1371/journal.pone.0173874] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 02/28/2017] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND The positive relationship between lean mass (LM) and bone health is well known, but a positive association between insulin and LM has also been described. Insulin has some anabolic properties on bone through the stimulation of osteoblast differentiation, yet the role of LM as a confounder or mediator in this relationship remains uncertain. OBJECTIVE To examine whether the association between insulin levels and bone health is mediated by LM. METHODS A cross-sectional study was conducted at the Castilla La Mancha University (Spain) involving 466 young adults (113 young men; 19.5±2.3 years). LM and total-body bone mineral content (BMC) were measured by dual energy x-ray absorptiometry, and insulin was measured in fasting serum samples. RESULTS Young adults with high total LM had higher values of total-body BMC than their peers after controlling for age and sex, this relationship persisted after adjusting for insulin levels (p<0.001). In mediation analyses, insulin levels were positively associated with total-body BMC (b = 0.05; p<0.001) and total LM acted as an intermediate variable, attenuating the association between insulin levels and total-body BMC (b = -31.98; p>0.05) as indicated by Sobel test values for indirect effect (z = 4.43; p<0.001). CONCLUSIONS LM plays an important role in the relationship between insulin levels and bone health, in such a way that while increases in LM have a positive influence on bone health, they are also negatively associated with insulin levels.
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Affiliation(s)
- Ana Torres-Costoso
- Universidad de Castilla-La Mancha. School of Nursing and Physiotherapy, Toledo, Spain
| | | | - Celia Álvarez-Bueno
- Universidad de Castilla-La Mancha. Health and Social Research Center, Cuenca, Spain
| | | | - Jose Miota Ibarra
- Universidad de Castilla-La Mancha. Health and Social Research Center, Cuenca, Spain
| | | | - Vicente Martínez-Vizcaíno
- Universidad de Castilla-La Mancha. Health and Social Research Center, Cuenca, Spain
- Universidad Autónoma de Chile. Facultad de Ciencias de la Salud., Talca, Chile
- * E-mail:
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18
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Escribano O, Beneit N, Rubio-Longás C, López-Pastor AR, Gómez-Hernández A. The Role of Insulin Receptor Isoforms in Diabetes and Its Metabolic and Vascular Complications. J Diabetes Res 2017; 2017:1403206. [PMID: 29201918 PMCID: PMC5671728 DOI: 10.1155/2017/1403206] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 09/12/2017] [Accepted: 09/25/2017] [Indexed: 12/18/2022] Open
Abstract
The insulin receptor (IR) presents by alternative splicing two isoforms: IRA and IRB. The differential physiological and pathological role of both isoforms is not completely known, and it is determinant the different binding affinity for insulin-like growth factor. IRB is more abundant in adult tissues and it exerts mainly the metabolic actions of insulin, whereas IRA is mainly expressed in fetal and prenatal period and exerts mitogenic actions. However, the change in the expression profile of both IR isoforms and its dysregulation are associated with the development of different pathologies, such as cancer, insulin resistance, diabetes, obesity, and atherosclerosis. In some of them, there is a significant increase of IRA/IRB ratio conferring a proliferative and migratory advantage to different cell types and favouring IGF-II actions with a sustained detriment in the metabolic effects of insulin. This review discussed specifically the role of IR isoforms as well as IGF-IR in diabetes and its associated complications as obesity and atherosclerosis. Future research with new IR modulators might be considered as possible targets to improve the treatment of diabetes and its associated complications.
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Affiliation(s)
- O. Escribano
- Biochemistry and Molecular Biology II Department, School of Pharmacy, Complutense University of Madrid, Madrid, Spain
- Health Research Institute of San Carlos Clinic Hospital (IdISSC), Madrid, Spain
- CIBER of Diabetes and Associated Metabolic Diseases, Madrid, Spain
| | - N. Beneit
- Biochemistry and Molecular Biology II Department, School of Pharmacy, Complutense University of Madrid, Madrid, Spain
- Health Research Institute of San Carlos Clinic Hospital (IdISSC), Madrid, Spain
- CIBER of Diabetes and Associated Metabolic Diseases, Madrid, Spain
| | - C. Rubio-Longás
- Biochemistry and Molecular Biology II Department, School of Pharmacy, Complutense University of Madrid, Madrid, Spain
| | - A. R. López-Pastor
- Biochemistry and Molecular Biology II Department, School of Pharmacy, Complutense University of Madrid, Madrid, Spain
| | - A. Gómez-Hernández
- Biochemistry and Molecular Biology II Department, School of Pharmacy, Complutense University of Madrid, Madrid, Spain
- Health Research Institute of San Carlos Clinic Hospital (IdISSC), Madrid, Spain
- CIBER of Diabetes and Associated Metabolic Diseases, Madrid, Spain
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Westermeier F, Sáez T, Arroyo P, Toledo F, Gutiérrez J, Sanhueza C, Pardo F, Leiva A, Sobrevia L. Insulin receptor isoforms: an integrated view focused on gestational diabetes mellitus. Diabetes Metab Res Rev 2016; 32:350-65. [PMID: 26431063 DOI: 10.1002/dmrr.2729] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/14/2015] [Accepted: 09/27/2015] [Indexed: 12/17/2022]
Abstract
The human insulin receptor (IR) exists in two isoforms that differ by the absence (IR-A) or the presence (IR-B) of a 12-amino acid segment encoded by exon 11. Both isoforms are functionally distinct regarding their binding affinities and intracellular signalling. However, the underlying mechanisms related to their cellular functions in several tissues are only partially understood. In this review, we summarize the current knowledge in this field regarding the alternative splicing of IR isoform, tissue-specific distribution and signalling both in physiology and disease, with an emphasis on the human placenta in gestational diabetes mellitus (GDM). Furthermore, we discuss the clinical relevance of IR isoforms highlighted by findings that show altered insulin signalling due to differential IR-A and IR-B expression in human placental endothelium in GDM pregnancies. Future research and clinical studies focused on the role of IR isoform signalling might provide novel therapeutic targets for treating GDM to improve the adverse maternal and neonatal outcomes.
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Affiliation(s)
- F Westermeier
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
- Advanced Centre for Chronic Diseases (ACCDiS), Faculty of Chemical & Pharmaceutical Sciences and Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Faculty of Science, Universidad San Sebastián, Santiago, Chile
| | - T Sáez
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
- University Medical Centre Groningen (UMCG), Faculty of Medicine, University of Groningen, Groningen, The Netherlands
| | - P Arroyo
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - F Toledo
- Department of Basic Sciences, Faculty of Sciences, Universidad del Bío-Bío, Chillán, Chile
| | - J Gutiérrez
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
- Cellular Signalling and Differentiation Laboratory (CSDL), School of Medical Technology, Health Sciences Faculty, Universidad San Sebastian, Santiago, Chile
| | - C Sanhueza
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - F Pardo
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - A Leiva
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - L Sobrevia
- Cellular and Molecular Physiology Laboratory (CMPL), Division of Obstetrics and Gynaecology, School of Medicine, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
- Department of Physiology, Faculty of Pharmacy, Universidad de Sevilla, Seville, Spain
- University of Queensland Centre for Clinical Research (UQCCR), Faculty of Medicine and Biomedical Sciences, University of Queensland, Queensland, Australia
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20
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Youssef A, Han VKM. Low Oxygen Tension Modulates the Insulin-Like Growth Factor-1 or -2 Signaling via Both Insulin-Like Growth Factor-1 Receptor and Insulin Receptor to Maintain Stem Cell Identity in Placental Mesenchymal Stem Cells. Endocrinology 2016; 157:1163-74. [PMID: 26760116 DOI: 10.1210/en.2015-1297] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Placental mesenchymal stem cells (PMSCs) are readily available multipotent stem cells for potential use in regenerative therapies. For this purpose, PMSCs must be maintained in culture conditions that mimic the in vivo microenvironment. IGFs (IGF-1 and IGF-2) and oxygen tension are low in the placenta in early gestation and increase as pregnancy progresses. IGFs bind to two receptor tyrosine kinases, the IGF-1 receptor (IGF-1R) and the insulin receptor (IR), and their hybrid receptors. We hypothesized that IGF-1 and IGF-2 signal via distinct signaling pathways under low-oxygen tension to maintain PMSC multipotency. In preterm PMSCs, low-oxygen tension increased the expression of IGF-2 and reduced IGF-1. IGF-1 stimulated higher phosphorylation of IGF-1Rβ, ERK1/2, and AKT, which was maintained at steady lower levels by low oxygen tension. PMSC proliferation was increased by IGF-1 more than IGF-2,and was potentiated by low-oxygen tension. This IGF/low oxygen tension-mediated proliferation was receptor dependent because neutralization of the IGF-1R inhibited PMSC proliferation in the presence of IGF-1 and the IR in presence of IGF-2. These findings suggest that both IGF-1R and the IR can participate in mediating IGF signaling in maintaining PMSCs multipotency. We conclude that low-oxygen tension can modify the IGF-1 or IGF-2 signaling via the IGF-1R and IR in PMSCs.
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Affiliation(s)
- Amer Youssef
- Departments of Biochemistry (A.Y., V.K.M.H.) and Paediatrics (V.K.M.H.), Schulich School of Medicine and Dentistry, Children's Health Research Institute (A.Y., V.K.M.H.), and Lawson Health Research Institute (A.Y., V.K.M.H.), Western University, London, Ontario, Canada N6C 2V5
| | - Victor K M Han
- Departments of Biochemistry (A.Y., V.K.M.H.) and Paediatrics (V.K.M.H.), Schulich School of Medicine and Dentistry, Children's Health Research Institute (A.Y., V.K.M.H.), and Lawson Health Research Institute (A.Y., V.K.M.H.), Western University, London, Ontario, Canada N6C 2V5
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Ivaska KK, Heliövaara MK, Ebeling P, Bucci M, Huovinen V, Väänänen HK, Nuutila P, Koistinen HA. The effects of acute hyperinsulinemia on bone metabolism. Endocr Connect 2015; 4:155-62. [PMID: 26047829 PMCID: PMC4496528 DOI: 10.1530/ec-15-0022] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 06/05/2015] [Indexed: 12/20/2022]
Abstract
Insulin signaling in bone-forming osteoblasts stimulates bone formation and promotes the release of osteocalcin (OC) in mice. Only a few studies have assessed the direct effect of insulin on bone metabolism in humans. Here, we studied markers of bone metabolism in response to acute hyperinsulinemia in men and women. Thirty-three subjects from three separate cohorts (n=8, n=12 and n=13) participated in a euglycaemic hyperinsulinemic clamp study. Blood samples were collected before and at the end of infusions to determine the markers of bone formation (PINP, total OC, uncarboxylated form of OC (ucOC)) and resorption (CTX, TRAcP5b). During 4 h insulin infusion (40 mU/m(2) per min, low insulin), CTX level decreased by 11% (P<0.05). High insulin infusion rate (72 mU/m(2) per min) for 4 h resulted in more pronounced decrease (-32%, P<0.01) whereas shorter insulin exposure (40 mU/m(2) per min for 2 h) had no effect (P=0.61). Markers of osteoblast activity remained unchanged during 4 h insulin, but the ratio of uncarboxylated-to-total OC decreased in response to insulin (P<0.05 and P<0.01 for low and high insulin for 4 h respectively). During 2 h low insulin infusion, both total OC and ucOC decreased significantly (P<0.01 for both). In conclusion, insulin decreases bone resorption and circulating levels of total OC and ucOC. Insulin has direct effects on bone metabolism in humans and changes in the circulating levels of bone markers can be seen within a few hours after administration of insulin.
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Affiliation(s)
- Kaisa K Ivaska
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Maikki K Heliövaara
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Pertti Ebeling
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Marco Bucci
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Ville Huovinen
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - H Kalervo Väänänen
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Pirjo Nuutila
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
| | - Heikki A Koistinen
- Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland Department of Cell Biology and AnatomyInstitute of Biomedicine, University of Turku, FI-20520 Turku, FinlandDepartment of MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandTurku PET CentreUniversity of Turku, Turku, FinlandDepartment of RadiologyUniversity of Turku, Turku, FinlandMedical Imaging Centre of Southwest FinlandTurku University Hospital, Turku, FinlandDepartment of EndocrinologyTurku University Hospital, Turku, FinlandAbdominal Center: EndocrinologyUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, FinlandMinerva Foundation Institute for Medical ResearchHelsinki, Finland
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22
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Montalcini T, Gallotti P, Coppola A, Zambianchi V, Fodaro M, Galliera E, Marazzi MG, Romeo S, Giannini S, Corsi Romanelli MM, Pujia A, Gazzaruso C. Association between low C-peptide and low lumbar bone mineral density in postmenopausal women without diabetes. Osteoporos Int 2015; 26:1639-46. [PMID: 25616509 PMCID: PMC4428888 DOI: 10.1007/s00198-015-3040-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 01/12/2015] [Indexed: 11/13/2022]
Abstract
UNLABELLED In this population-based, cross-sectional study in Italian postmenopausal females not affected by diabetes, we showed a link between serum C-peptide and lumbar bone mineral density, suggesting that C-peptide exerts an insulin-independent effect on bone mass. INTRODUCTION It is well known that type 1 (T1) diabetes, characterized by insulin and C-peptide deficiency, is associated with a low lumbar bone mineral density and an increased risk for fracture. While a role for insulin in the pathogenesis of osteoporosis has been demonstrated, the association between C-peptide and the bone mineral density has not been investigated. We conducted a study in a cohort of 84 postmenopausal women without diabetes to clarify the association between serum C-peptide and the lumbar bone mineral density. METHODS Participants underwent a bone mineral density evaluation by DXA and biochemical analysis including the C-peptide assay. RESULTS rteen percent of the population had osteoporosis and 38% had osteopenia. With ANOVA test, we showed that women with the lowest C-peptide concentration had lower lumbar mineral density in comparison to those in all other C-peptide concentration group (p = 0.02 among groups after adjustment). The univariate and multivariate analysis showed that C-peptide was positively associated with both lumbar T-score and Z-score besides other well-known factors like age (with T-score p < 0.001; beta = -0.38) and BMI (with T-score p = 0.009; beta = 0.34), while insulin was not correlated with the lumbar bone mineral density. The area under the receiver operating characteristic (ROC) curve for C-peptide to predict the absence of lumbar osteoporosis was 0.74 (SE = 0.073; p = 0.013). CONCLUSIONS These results suggest that C-peptide may exert an insulin- and BMI-independent effect on lumbar bone mineral density and that further large-scale studies are needed in order to clarify its role in bone mineralization especially in subjects without diabetes.
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Affiliation(s)
- T Montalcini
- Clinical Nutrition Unit, Care Center in Menopause, Department of Medical and Surgical Science, University Magna Grecia of Catanzaro, Campus Universitario Germaneto, Viale S. Venuta, 88100, Catanzaro, Italy,
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23
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Andres SF, Santoro MA, Mah AT, Keku JA, Bortvedt AE, Blue RE, Lund PK. Deletion of intestinal epithelial insulin receptor attenuates high-fat diet-induced elevations in cholesterol and stem, enteroendocrine, and Paneth cell mRNAs. Am J Physiol Gastrointest Liver Physiol 2015; 308:G100-11. [PMID: 25394660 PMCID: PMC4297856 DOI: 10.1152/ajpgi.00287.2014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The insulin receptor (IR) regulates nutrient uptake and utilization in multiple organs, but its role in the intestinal epithelium is not defined. This study developed a mouse model with villin-Cre (VC) recombinase-mediated intestinal epithelial cell (IEC)-specific IR deletion (VC-IR(Δ/Δ)) and littermate controls with floxed, but intact, IR (IR(fl/fl)) to define in vivo roles of IEC-IR in mice fed chow or high-fat diet (HFD). We hypothesized that loss of IEC-IR would alter intestinal growth, biomarkers of intestinal epithelial stem cells (IESC) or other lineages, body weight, adiposity, and glucose or lipid handling. In lean, chow-fed mice, IEC-IR deletion did not affect body or fat mass, plasma glucose, or IEC proliferation. In chow-fed VC-IR(Δ/Δ) mice, mRNA levels of the Paneth cell marker lysozyme (Lyz) were decreased, but markers of other differentiated lineages were unchanged. During HFD-induced obesity, IR(fl/fl) and VC-IR(Δ/Δ) mice exhibited similar increases in body and fat mass, plasma insulin, mRNAs encoding several lipid-handling proteins, a decrease in Paneth cell number, and impaired glucose tolerance. In IR(fl/fl) mice, HFD-induced obesity increased circulating cholesterol; numbers of chromogranin A (CHGA)-positive enteroendocrine cells (EEC); and mRNAs encoding Chga, glucose-dependent insulinotrophic peptide (Gip), glucagon (Gcg), Lyz, IESC biomarkers, and the enterocyte cholesterol transporter Scarb1. All these effects were attenuated or lost in VC-IR(Δ/Δ) mice. These results demonstrate that IEC-IR is not required for normal growth of the intestinal epithelium in lean adult mice. However, our findings provide novel evidence that, during HFD-induced obesity, IEC-IR contributes to increases in EEC, plasma cholesterol, and increased expression of Scarb1 or IESC-, EEC-, and Paneth cell-derived mRNAs.
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Affiliation(s)
- Sarah F. Andres
- 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; and
| | - M. Agostina Santoro
- 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; and
| | - Amanda T. Mah
- 2Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - J. Adeola Keku
- 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; and
| | - Amy E. Bortvedt
- 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; and
| | - R. Eric Blue
- 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; and
| | - P. Kay Lund
- 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina; and
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24
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Shao J, Wang Z, Yang T, Ying H, Zhang Y, Liu S. Bone Regulates Glucose Metabolism as an Endocrine Organ through Osteocalcin. Int J Endocrinol 2015; 2015:967673. [PMID: 25873961 PMCID: PMC4383405 DOI: 10.1155/2015/967673] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 08/21/2014] [Accepted: 09/18/2014] [Indexed: 12/12/2022] Open
Abstract
Skeleton was considered as a dynamic connective tissue, which was essential for mobility, calcium homeostasis, and hematopoietic niche. However more and more evidences indicate that skeleton works not only as a structural scaffold but also as an endocrine organ, which regulates several metabolic processes. Besides osteoprotegerin (OPG), sclerostin (SOST), and Dickopf (DKK) which play essential roles in bone formation, modelling, remodelling, and homeostasis, bone can also secret hormones, such as osteocalcin (OCN), which promotes proliferation of β cells, insulin secretion, and insulin sensitivity. Additionally OCN can also regulate the fat cells and male gonad endocrine activity and be regulated by insulin and the neural system. In summary, skeleton has endocrine function via OCN and plays an important role in energy metabolism, especially in glucose metabolism.
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Affiliation(s)
- Jin Shao
- Department of Orthopaedics, Shanghai Pudong New Area Gongli Hospital/Clinical School, The Second Military Medical University, Shanghai 200135, China
| | - Zhi Wang
- Department of Orthopaedics, Shanghai Pudong New Area Gongli Hospital/Clinical School, The Second Military Medical University, Shanghai 200135, China
| | - Tieyi Yang
- Department of Orthopaedics, Shanghai Pudong New Area Gongli Hospital/Clinical School, The Second Military Medical University, Shanghai 200135, China
- *Tieyi Yang:
| | - Hui Ying
- Department of Orthopaedics, Shanghai Pudong New Area Gongli Hospital/Clinical School, The Second Military Medical University, Shanghai 200135, China
| | - Yan Zhang
- Department of Orthopaedics, Shanghai Pudong New Area Gongli Hospital/Clinical School, The Second Military Medical University, Shanghai 200135, China
| | - Shuyi Liu
- Department of Orthopaedics, Shanghai Pudong New Area Gongli Hospital/Clinical School, The Second Military Medical University, Shanghai 200135, China
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25
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Klein GL. Insulin and bone: Recent developments. World J Diabetes 2014; 5:14-16. [PMID: 24567798 PMCID: PMC3932424 DOI: 10.4239/wjd.v5.i1.14] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2013] [Revised: 12/04/2013] [Accepted: 12/19/2013] [Indexed: 02/05/2023] Open
Abstract
While insulin-like growth factor I is a well-known anabolic agent in bone evidence is beginning to accumulate that its homologue, insulin, also has some anabolic properties for bone. There is specific evidence that insulin may work to stimulate osteoblast differentiation, which in turn would enhance production of osteocalcin, the osteoblast-produced peptide that can stimulate pancreatic β cell proliferation and skeletal muscle insulin sensitivity. It is uncertain whether insulin stimulates bone directly or indirectly by increasing muscle work and therefore skeletal loading. We raise the question of the sequence of events that occurs with insulin resistance, such as type 2 diabetes. Evidence to date suggests that these patients have lower serum concentrations of osteocalcin, perhaps reduced skeletal loading, and reduced bone strength as evidenced by micro-indentation studies.
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26
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Andres SF, Simmons JG, Mah AT, Santoro MA, Van Landeghem L, Lund PK. Insulin receptor isoform switching in intestinal stem cells, progenitors, differentiated lineages and tumors: evidence that IR-B limits proliferation. J Cell Sci 2013; 126:5645-56. [PMID: 24127567 DOI: 10.1242/jcs.132985] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Despite evidence for the impact of insulin on intestinal epithelial physiology and pathophysiology, the expression patterns, roles, and regulation of insulin receptor (IR) and IR isoforms in the intestinal epithelium are not well characterized. IR-A is thought to mediate the proliferative effects of insulin or insulin growth factors (IGFs) in fetal or cancer cells. IR-B is considered to be the metabolic receptor for insulin in specialized tissues. This study used a novel Sox9-EGFP reporter mouse that permits isolation of intestinal epithelial stem cells (IESCs), progenitors, enteroendocrine cells and differentiated lineages, the Apc(Min/+) mouse model of precancerous adenoma and normal human intestinal and colorectal cancer (CRC) cell lines. We tested the hypothesis that there is differential expression of IR-A or IR-B in stem and tumor cells versus differentiated intestinal epithelial cells (IECs) and that IR-B impacts cell proliferation. Our findings provide evidence that IR-B expression is significantly lower in highly proliferative IESCs and progenitor cells versus post-mitotic, differentiated IECs and in subconfluent and undifferentiated versus differentiated Caco-2 cells. IR-B is also reduced in Apc(Min/+) tumors and highly tumorigenic CRC cells. These differences in IR-B were accompanied by altered levels of mRNAs encoding muscleblind-like 2 (MBNL2), a known regulator of IR alternative splicing. Forced IR-B expression in subconfluent and undifferentiated Caco-2 cells reduced proliferation and increased biomarkers of differentiation. Our findings indicate that the impact of insulin on different cell types in the intestinal epithelium might differ depending on relative IR-B IR-A expression levels and provide new evidence for the roles of IR-B to limit proliferation of CRC cells.
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Affiliation(s)
- Sarah F Andres
- Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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27
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Affiliation(s)
- Frederic Clermont
- Laboratory for Molecular Cancer Biology, Center for the Biology of Disease, VIB-KULeuven, Leuven, Belgium
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