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Richman J, Phelps M. Activin Signaling Pathway Specialization During Embryonic and Skeletal Muscle Development in Rainbow Trout (Oncorhynchus mykiss). MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2024; 26:766-775. [PMID: 39052141 DOI: 10.1007/s10126-024-10345-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 07/13/2024] [Indexed: 07/27/2024]
Abstract
Activin signaling is essential for proper embryonic, skeletal muscle, and reproductive development. Duplication of the pathway in teleost fish has enabled diversification of gene function across the pathway but how gene duplication influences the function of activin signaling in non-mammalian species is poorly understood. Full characterization of activin receptor signaling pathway expression was performed across embryonic development and during early skeletal muscle growth in rainbow trout (RBT, Oncorhynchus mykiss). Rainbow trout are a model salmonid species that have undergone two additional rounds of whole genome duplication. A small number of genes were expressed early in development and most genes increased expression throughout development. There was limited expression of activin Ab in RBT embryos despite these genes exhibiting significantly elevated expression in post-hatch skeletal muscle. CRISPR editing of the activin Aa1 ohnolog and subsequent production of meiotic gynogenetic offspring revealed that biallelic disruption of activin Aa1 did not result in developmental defects, as occurs with knockout of activin A in mammals. The majority of gynogenetic offspring exhibited homozygous activin Aa1 genotypes (wild type, in-frame, or frameshift) derived from the mosaic founder female. The research identifies mechanisms of specialization among the duplicated activin ohnologs across embryonic development and during periods of high muscle growth in larval and juvenile fish. The knowledge gained provides insights into potential viable gene-targeting approaches for engineering the activin receptor signaling pathway and establishes the feasibility of employing meiotic gynogenesis as a tool for producing homozygous F1 genome-edited fish for species with long-generation times, such as salmonids.
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Affiliation(s)
- Jasmine Richman
- Department of Animal Sciences, Washington State University, Pullman, WA, USA
| | - Michael Phelps
- Department of Animal Sciences, Washington State University, Pullman, WA, USA.
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2
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Kaspiris A, Vasiliadis ES, Tsalimas G, Melissaridou D, Lianou I, Panagopoulos F, Katzouraki G, Vavourakis M, Kolovos I, Savvidou OD, Papadimitriou E, Pneumaticos SG. Unraveling the Link of Altered TGFβ Signaling with Scoliotic Vertebral Malformations in Osteogenesis Imperfecta: A Comprehensive Review. J Clin Med 2024; 13:3484. [PMID: 38930011 PMCID: PMC11204596 DOI: 10.3390/jcm13123484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 05/27/2024] [Accepted: 06/12/2024] [Indexed: 06/28/2024] Open
Abstract
Osteogenesis Imperfecta (OI) is a genetic disorder caused by mutations in genes responsible for collagen synthesis or polypeptides involved in the formation of collagen fibers. Its predominant skeletal complication is scoliosis, impacting 25 to 80% of OI patients. Vertebral deformities of the scoliotic curves in OI include a variety of malformations such as codfish, wedged-shaped vertebrae or platyspondyly, craniocervical junction abnormalities, and lumbosacral spondylolysis and spondylolisthesis. Although the precise pathophysiology of these spinal deformities remains unclear, anomalies in bone metabolism have been implicated in the progression of scoliotic curves. Bone Mineral Density (BMD) measurements have demonstrated a significant reduction in the Z-score, indicating osteoporosis and a correlation with the advancement of scoliosis. Factors such as increased mechanical strains, joint hypermobility, lower leg length discrepancy, pelvic obliquity, spinal ligament hypermobility, or vertebrae microfractures may also contribute to the severity of scoliosis. Histological vertebral analysis has confirmed that changes in trabecular microarchitecture, associated with inadequate bone turnover, indicate generalized bone metabolic defects in OI. At the molecular level, the upregulation of Transforming Growth factor-β (TGFβ) signaling in OI can lead to disturbed bone turnover and changes in muscle mass and strength. Understanding the relationship between spinal clinical features and molecular pathways could unveil TGFβ -related molecular targets, paving the way for novel therapeutic approaches in OI.
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Affiliation(s)
- Angelos Kaspiris
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
- Laboratory of Molecular Pharmacology, Group for Orthopaedic Research, School of Health Sciences, University of Patras, 26504 Patras, Greece;
| | - Elias S. Vasiliadis
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
| | - Georgios Tsalimas
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
| | - Dimitra Melissaridou
- First Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “ATTIKON” University Hospital, Rimini 1, 12462 Athens, Greece; (D.M.); (O.D.S.)
| | - Ioanna Lianou
- Department of Orthopaedic Surgery, “Rion” University Hospital and Medical School, School of Health Sciences, University of Patras, 26504 Patras, Greece; (I.L.); (F.P.)
| | - Fotios Panagopoulos
- Department of Orthopaedic Surgery, “Rion” University Hospital and Medical School, School of Health Sciences, University of Patras, 26504 Patras, Greece; (I.L.); (F.P.)
| | - Galateia Katzouraki
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
| | - Michail Vavourakis
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
| | - Ioannis Kolovos
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
| | - Olga D. Savvidou
- First Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “ATTIKON” University Hospital, Rimini 1, 12462 Athens, Greece; (D.M.); (O.D.S.)
| | - Evangelia Papadimitriou
- Laboratory of Molecular Pharmacology, Group for Orthopaedic Research, School of Health Sciences, University of Patras, 26504 Patras, Greece;
| | - Spiros G. Pneumaticos
- Third Department of Orthopaedic Surgery, School of Medicine, National and Kapodistrian University of Athens, “KAT” General Hospital, Nikis 2, 14561 Athens, Greece; (E.S.V.); (G.T.); (G.K.); (M.V.); (I.K.); (S.G.P.)
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Panahipour L, Abbasabadi AO, Wagner A, Kratochwill K, Pichler M, Gruber R. Bone Allograft Acid Lysates Change the Genetic Signature of Gingival Fibroblasts. Int J Mol Sci 2023; 24:16181. [PMID: 38003371 PMCID: PMC10671348 DOI: 10.3390/ijms242216181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/06/2023] [Accepted: 11/09/2023] [Indexed: 11/26/2023] Open
Abstract
Bone allografts are widely used as osteoconductive support to guide bone regrowth. Bone allografts are more than a scaffold for the immigrating cells as they maintain some bioactivity of the original bone matrix. Yet, it remains unclear how immigrating cells respond to bone allografts. To this end, we have evaluated the response of mesenchymal cells exposed to acid lysates of bone allografts (ALBA). RNAseq revealed that ALBA has a strong impact on the genetic signature of gingival fibroblasts, indicated by the increased expression of IL11, AREG, C11orf96, STC1, and GK-as confirmed by RT-PCR, and for IL11 and STC1 by immunoassays. Considering that transforming growth factor-β (TGF-β) is stored in the bone matrix and may have caused the expression changes, we performed a proteomics analysis, TGF-β immunoassay, and smad2/3 nuclear translocation. ALBA neither showed detectable TGF-β nor was the lysate able to induce smad2/3 translocation. Nevertheless, the TGF-β receptor type I kinase inhibitor SB431542 significantly decreased the expression of IL11, AREG, and C11orf96, suggesting that other agonists than TGF-β are responsible for the robust cell response. The findings suggest that IL11, AREG, and C11orf96 expression in mesenchymal cells can serve as a bioassay reflecting the bioactivity of the bone allografts.
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Affiliation(s)
- Layla Panahipour
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.)
| | - Azarakhsh Oladzad Abbasabadi
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.)
| | - Anja Wagner
- Core Facility Proteomics, Medical University of Vienna, 1090 Vienna, Austria; (A.W.); (K.K.)
- Christian Doppler Laboratory for Molecular Stress Research in Peritoneal Dialysis, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, 1090 Vienna, Austria
- Division of Pediatric Nephrology and Gastroenterology, Department of Pediatrics and Adolescent Medicine, Comprehensive Center for Pediatrics, Medical University of Vienna, 1090 Vienna, Austria
| | - Klaus Kratochwill
- Core Facility Proteomics, Medical University of Vienna, 1090 Vienna, Austria; (A.W.); (K.K.)
- Christian Doppler Laboratory for Molecular Stress Research in Peritoneal Dialysis, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, 1090 Vienna, Austria
- Division of Pediatric Nephrology and Gastroenterology, Department of Pediatrics and Adolescent Medicine, Comprehensive Center for Pediatrics, Medical University of Vienna, 1090 Vienna, Austria
| | | | - Reinhard Gruber
- Department of Oral Biology, University Clinic of Dentistry, Medical University of Vienna, 1090 Vienna, Austria; (L.P.); (A.O.A.)
- Department of Periodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
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4
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Tsourdi E. RANKL blockade for cancer cachexia; a new therapeutic opportunity? J Bone Miner Res 2022; 37:379-380. [PMID: 35067972 DOI: 10.1002/jbmr.4511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 01/19/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Elena Tsourdi
- Department of Medicine III and Center for Healthy Aging, University Clinic Dresden Medical Center, Dresden, Germany
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5
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Trivedi T, Guise TA. Systemic effects of abnormal bone resorption on muscle, metabolism, and cognition. Bone 2022; 154:116245. [PMID: 34718221 DOI: 10.1016/j.bone.2021.116245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 10/21/2021] [Accepted: 10/25/2021] [Indexed: 12/11/2022]
Abstract
Skeletal tissue is dynamic, undergoing constant remodeling to maintain musculoskeletal integrity and balance in the human body. Recent evidence shows that apart from maintaining homeostasis in the local microenvironment, the skeleton systemically affects other tissues. Several cancer-associated and noncancer-associated bone disorders can disrupt the physiological homeostasis locally in the bone microenvironment and indirectly contribute to dysregulation of systemic body function. The systemic effects of bone on the regulation of distant organ function have not been widely explored. Recent evidence suggests that bone can interact with skeletal muscle, pancreas, and brain by releasing factors from mineralized bone matrix. Currently available bone-targeting therapies such as bisphosphonates and denosumab inhibit bone resorption, decrease morbidity associated with bone destruction, and improve survival. Bisphosphonates have been a standard treatment for bone metastases, osteoporosis, and cancer treatment-induced bone diseases. The extraskeletal effects of bisphosphonates on inhibition of tumor growth are known. However, our knowledge of the effects of bisphosphonates on muscle weakness, hyperglycemia, and cognitive defects is currently evolving. To be able to identify the molecular link between bone and distant organs during abnormal bone resorption and then treat these abnormalities and prevent their systemic effects could improve survival benefits. The current review highlights the link between bone resorption and its systemic effects on muscle, pancreas, and brain.
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Affiliation(s)
- Trupti Trivedi
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America
| | - Theresa A Guise
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, TX, United States of America.
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Trivedi T, Pagnotti GM, Guise TA, Mohammad KS. The Role of TGF-β in Bone Metastases. Biomolecules 2021; 11:1643. [PMID: 34827641 PMCID: PMC8615596 DOI: 10.3390/biom11111643] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/29/2021] [Accepted: 10/29/2021] [Indexed: 02/07/2023] Open
Abstract
Complications associated with advanced cancer are a major clinical challenge and, if associated with bone metastases, worsen the prognosis and compromise the survival of the patients. Breast and prostate cancer cells exhibit a high propensity to metastasize to bone. The bone microenvironment is unique, providing fertile soil for cancer cell propagation, while mineralized bone matrices store potent growth factors and cytokines. Biologically active transforming growth factor β (TGF-β), one of the most abundant growth factors, is released following tumor-induced osteoclastic bone resorption. TGF-β promotes tumor cell secretion of factors that accelerate bone loss and fuel tumor cells to colonize. Thus, TGF-β is critical for driving the feed-forward vicious cycle of tumor growth in bone. Further, TGF-β promotes epithelial-mesenchymal transition (EMT), increasing cell invasiveness, angiogenesis, and metastatic progression. Emerging evidence shows TGF-β suppresses immune responses, enabling opportunistic cancer cells to escape immune checkpoints and promote bone metastases. Blocking TGF-β signaling pathways could disrupt the vicious cycle, revert EMT, and enhance immune response. However, TGF-β's dual role as both tumor suppressor and enhancer presents a significant challenge in developing therapeutics that target TGF-β signaling. This review presents TGF-β's role in cancer progression and bone metastases, while highlighting current perspectives on the therapeutic potential of targeting TGF-β pathways.
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Affiliation(s)
- Trupti Trivedi
- Department of Endocrine Neoplasia and Hormonal Disorders, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (T.T.); (G.M.P.); (T.A.G.)
| | - Gabriel M. Pagnotti
- Department of Endocrine Neoplasia and Hormonal Disorders, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (T.T.); (G.M.P.); (T.A.G.)
| | - Theresa A. Guise
- Department of Endocrine Neoplasia and Hormonal Disorders, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (T.T.); (G.M.P.); (T.A.G.)
| | - Khalid S. Mohammad
- Department of Endocrine Neoplasia and Hormonal Disorders, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (T.T.); (G.M.P.); (T.A.G.)
- College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia
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7
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Wyart E, Bindels LB, Mina E, Menga A, Stanga S, Porporato PE. Cachexia, a Systemic Disease beyond Muscle Atrophy. Int J Mol Sci 2020; 21:E8592. [PMID: 33202621 PMCID: PMC7696729 DOI: 10.3390/ijms21228592] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/06/2020] [Accepted: 11/12/2020] [Indexed: 02/06/2023] Open
Abstract
Cachexia is a complication of dismal prognosis, which often represents the last step of several chronic diseases. For this reason, the comprehension of the molecular drivers of such a condition is crucial for the development of management approaches. Importantly, cachexia is a syndrome affecting various organs, which often results in systemic complications. To date, the majority of the research on cachexia has been focused on skeletal muscle, muscle atrophy being a pivotal cause of weight loss and the major feature associated with the steep reduction in quality of life. Nevertheless, defining the impact of cachexia on other organs is essential to properly comprehend the complexity of such a condition and potentially develop novel therapeutic approaches.
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Affiliation(s)
- Elisabeth Wyart
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, 10126 Turin, Italy; (E.W.); (E.M.); (A.M.)
| | - Laure B. Bindels
- Metabolism and Nutrition Research Group, Louvain Drug Research Institute, UCLouvain, Université Catholique de Louvain, 1200 Brussels, Belgium;
| | - Erica Mina
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, 10126 Turin, Italy; (E.W.); (E.M.); (A.M.)
| | - Alessio Menga
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, 10126 Turin, Italy; (E.W.); (E.M.); (A.M.)
| | - Serena Stanga
- Neuroscience Institute Cavalieri Ottolenghi, 10043 Orbassano (TO), Department of Neuroscience Rita Levi Montalcini, University of Turin, 10126 Turin, Italy;
| | - Paolo E. Porporato
- Department of Molecular Biotechnology and Health Sciences, Molecular Biotechnology Center, University of Torino, 10126 Turin, Italy; (E.W.); (E.M.); (A.M.)
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8
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Abstract
Tumours reprogram host physiology, metabolism and immune responses during cancer progression. The release of soluble factors, exosomes and metabolites from tumours leads to systemic changes in distant organs, where cancer cells metastasize and grow. These tumour-derived circulating factors also profoundly impact tissues that are rarely inhabited by metastatic cancer cells such as skeletal muscle and adipose tissue. In fact, the majority of patients with metastatic cancer develop a debilitating muscle-wasting syndrome, known as cachexia, that is associated with decreased tolerance to antineoplastic therapy, poor prognosis and accelerated death, with no approved treatments. In this Perspective, we discuss the development of cachexia in the context of metastatic progression. We briefly discuss how circulating factors either directly or indirectly promote cachexia development and examine how signals from the metastatic process can trigger and amplify this process. Finally, we highlight promising therapeutic opportunities for targeting cachexia in the context of metastatic cancers.
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Affiliation(s)
- Anup K Biswas
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, Columbia University, New York, NY, USA
| | - Swarnali Acharyya
- Institute for Cancer Genetics, Department of Pathology and Cell Biology, Columbia University, New York, NY, USA.
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY, USA.
- Herbert Irving Comprehensive Cancer Center, New York, NY, USA.
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9
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Hain BA, Jude B, Xu H, Smuin DM, Fox EJ, Elfar JC, Waning DL. Zoledronic Acid Improves Muscle Function in Healthy Mice Treated with Chemotherapy. J Bone Miner Res 2020; 35:368-381. [PMID: 31614017 DOI: 10.1002/jbmr.3890] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/18/2019] [Accepted: 10/05/2019] [Indexed: 12/20/2022]
Abstract
Carboplatin is a chemotherapy drug used to treat solid tumors but also causes bone loss and muscle atrophy and weakness. Bone loss contributes to muscle weakness through bone-muscle crosstalk, which is prevented with the bisphosphonate zoledronic acid (ZA). We treated mice with carboplatin in the presence or absence of ZA to assess the impact of bone resorption on muscle. Carboplatin caused loss of body weight, muscle mass, and bone mass, and also led to muscle weakness as early as 7 days after treatment. Mice treated with carboplatin and ZA lost body weight and muscle mass but did not lose bone mass. In addition, muscle function in mice treated with ZA was similar to control animals. We also used the anti-TGFβ antibody (1D11) to prevent carboplatin-induced bone loss and showed similar results to ZA-treated mice. We found that atrogin-1 mRNA expression was increased in muscle from mice treated with carboplatin, which explained muscle atrophy. In mice treated with carboplatin for 1 or 3 days, we did not observe any bone or muscle loss, or muscle weakness. In addition, reduced caloric intake in the carboplatin treated mice did not cause loss of bone or muscle mass, or muscle weakness. Our results show that blocking carboplatin-induced bone resorption is sufficient to prevent skeletal muscle weakness and suggests another benefit to bone therapy beyond bone in patients receiving chemotherapy. © 2019 American Society for Bone and Mineral Research.
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Affiliation(s)
- Brian A Hain
- Department of Cellular and Molecular Physiology, The Penn State College of Medicine, Hershey, PA, USA
| | - Baptiste Jude
- Department of Cellular and Molecular Physiology, The Penn State College of Medicine, Hershey, PA, USA
| | - Haifang Xu
- Department of Cellular and Molecular Physiology, The Penn State College of Medicine, Hershey, PA, USA
| | - Dallas M Smuin
- Department of Orthopaedics and Rehabilitation, The Penn State College of Medicine, Hershey, PA, USA
| | - Edward J Fox
- Department of Orthopaedics and Rehabilitation, The Penn State College of Medicine, Hershey, PA, USA.,Center for Orthopaedic Research and Translational Science, Hershey, PA, USA
| | - John C Elfar
- Department of Orthopaedics and Rehabilitation, The Penn State College of Medicine, Hershey, PA, USA.,Center for Orthopaedic Research and Translational Science, Hershey, PA, USA
| | - David L Waning
- Department of Cellular and Molecular Physiology, The Penn State College of Medicine, Hershey, PA, USA.,Center for Orthopaedic Research and Translational Science, Hershey, PA, USA.,Penn State Cancer Institute, Hershey, PA, USA
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Barreto R, Kitase Y, Matsumoto T, Pin F, Colston KC, Couch KE, O'Connell TM, Couch ME, Bonewald LF, Bonetto A. ACVR2B/Fc counteracts chemotherapy-induced loss of muscle and bone mass. Sci Rep 2017; 7:14470. [PMID: 29089584 PMCID: PMC5665981 DOI: 10.1038/s41598-017-15040-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 10/20/2017] [Indexed: 01/06/2023] Open
Abstract
Chemotherapy promotes the development of cachexia, a debilitating condition characterized by muscle and fat loss. ACVR2B/Fc, an inhibitor of the Activin Receptor 2B signaling, has been shown to preserve muscle mass and prolong survival in tumor hosts, and to increase bone mass in models of osteogenesis imperfecta and muscular dystrophy. We compared the effects of ACVR2B/Fc on muscle and bone mass in mice exposed to Folfiri. In addition to impairing muscle mass and function, Folfiri had severe negative effects on bone, as shown by reduced trabecular bone volume fraction (BV/TV), thickness (Tb.Th), number (Tb.N), connectivity density (Conn.Dn), and by increased separation (Tb.Sp) in trabecular bone of the femur and vertebra. ACVR2B/Fc prevented the loss of muscle mass and strength, and the loss of trabecular bone in femurs and vertebrae following Folfiri administration. Neither Folfiri nor ACVR2B/Fc had effects on femoral cortical bone, as shown by unchanged cortical bone volume fraction (Ct.BV/TV), thickness (Ct.Th) and porosity. Our results suggest that Folfiri is responsible for concomitant muscle and bone degeneration, and that ACVR2B/Fc prevents these derangements. Future studies are required to determine if the same protective effects are observed in combination with other anticancer regimens or in the presence of cancer.
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Affiliation(s)
- Rafael Barreto
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Yukiko Kitase
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Tsutomu Matsumoto
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Fabrizio Pin
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Kyra C Colston
- Indianapolis Project STEM, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Katherine E Couch
- Indianapolis Project STEM, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Thomas M O'Connell
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Department of Otolaryngology - Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,IUPUI Center for Cachexia Research Innovation and Therapy, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Marion E Couch
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Department of Otolaryngology - Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,IUPUI Center for Cachexia Research Innovation and Therapy, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Lynda F Bonewald
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.,IUPUI Center for Cachexia Research Innovation and Therapy, Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Andrea Bonetto
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,Department of Otolaryngology - Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. .,IUPUI Center for Cachexia Research Innovation and Therapy, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
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Abstract
PURPOSE OF REVIEW The role of bone-derived factors in regulation of skeletal muscle function is an important emerging aspect of research into bone-muscle crosstalk. Implications for this area of research are far reaching and include understanding skeletal muscle weakness in cancer, osteoporosis, cachexia, rare diseases of bone, and aging. RECENT FINDINGS Recent research shows that bone-derived factors can lead to changes in the skeletal muscle. These changes can either be anabolic or catabolic, and we focus this review on the role of TGFβ in driving oxidative stress and skeletal muscle weakness in the setting of osteolytic cancer in the bone. The bone is a preferred site for breast cancer metastasis and leads to pathological bone loss. Osteolytic cancer in the bone leads to release of TGFβ from the bone via osteoclast-mediated bone destruction. Our appreciation of crosstalk between the muscle and bone has recently expanded beyond mechanical force-driven events to encompass a variety of signaling factors originating in one tissue and communicating to the other. This review summarizes some previously known mediators of bone-to-muscle signaling and also recent work identifying a new role for bone-derived TGFβ as a cause of skeletal muscle weakness in the setting of osteolytic cancer in the bone. Multiple points of potential therapeutic intervention are discussed.
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Affiliation(s)
- Jenna N Regan
- Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Trupti Trivedi
- Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - Theresa A Guise
- Indiana University School of Medicine, Indianapolis, IN, 46202, USA
| | - David L Waning
- The Pennsylvania State University College of Medicine, 500 University Drive, H166, Rm C4710E, Hershey, PA, 17033, USA.
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D'Mello S, Atluri K, Geary SM, Hong L, Elangovan S, Salem AK. Bone Regeneration Using Gene-Activated Matrices. AAPS JOURNAL 2016; 19:43-53. [PMID: 27655418 DOI: 10.1208/s12248-016-9982-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 08/26/2016] [Indexed: 01/04/2023]
Abstract
Gene delivery to bone is a potential therapeutic strategy for directed, sustained, and regulated protein expression. Tissue engineering strategies for bone regeneration include delivery of proteins, genes (viral and non-viral-mediated delivery), and/or cells to the bone defect site. In addition, biomimetic scaffolds and scaffolds incorporating bone anabolic agents greatly enhance the bone repair process. Regional gene therapy has the potential of enhancing bone defect healing and bone regeneration by delivering osteogenic genes locally to the osseous lesions, thereby reducing systemic toxicity and the need for using supraphysiological dosages of therapeutic proteins. By implanting gene-activated matrices (GAMs), sustained gene expression and continuous osteogenic protein production in situ can be achieved in a way that stimulates osteogenesis and bone repair within osseous defects. Critical parameters substantially affecting the therapeutic efficacy of gene therapy include the choice of osteogenic transgene(s), selection of non-viral or viral vectors, the wound environment, and the selection of ex vivo and in vivo gene delivery strategies, such as GAMs. It is critical for gene therapy applications that clinically beneficial amounts of proteins are synthesized endogenously within and around the lesion in a sustained manner. It is therefore necessary that reliable and reproducible methods of gene delivery be developed and tested for their efficacy and safety before translating into clinical practice. Practical considerations such as the age, gender, and systemic health of patients and the nature of the disease process also need to be taken into account in order to personalize the treatments and progress towards developing a clinically applicable gene therapy for healing bone defects. This review discusses tissue engineering strategies to regenerate bone with specific focus on non-viral gene delivery systems.
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Affiliation(s)
- Sheetal D'Mello
- Division of Pharmaceutics and Translational Therapeutics, College of Pharmacy, University of Iowa, 115 S. Grand Avenue, S228 PHAR, Iowa City, Iowa, 52242, USA
| | - Keerthi Atluri
- Division of Pharmaceutics and Translational Therapeutics, College of Pharmacy, University of Iowa, 115 S. Grand Avenue, S228 PHAR, Iowa City, Iowa, 52242, USA
| | - Sean M Geary
- Division of Pharmaceutics and Translational Therapeutics, College of Pharmacy, University of Iowa, 115 S. Grand Avenue, S228 PHAR, Iowa City, Iowa, 52242, USA
| | - Liu Hong
- Department of Prosthodontics, College of Dentistry, University of Iowa, Iowa City, Iowa, 52242, USA
| | - Satheesh Elangovan
- Department of Periodontics, College of Dentistry, University of Iowa, 801 Newton Road, S464, Iowa City, Iowa, 52242, USA.
| | - Aliasger K Salem
- Division of Pharmaceutics and Translational Therapeutics, College of Pharmacy, University of Iowa, 115 S. Grand Avenue, S228 PHAR, Iowa City, Iowa, 52242, USA. .,Department of Periodontics, College of Dentistry, University of Iowa, 801 Newton Road, S464, Iowa City, Iowa, 52242, USA.
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Tsuzuki S, Park SH, Eber MR, Peters CM, Shiozawa Y. Skeletal complications in cancer patients with bone metastases. Int J Urol 2016; 23:825-832. [PMID: 27488133 DOI: 10.1111/iju.13170] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Accepted: 06/07/2016] [Indexed: 12/13/2022]
Abstract
As a result of significant improvements in current therapies, the life expectancy of cancer patients with bone metastases has dramatically improved. Unfortunately, these patients often experience skeletal complications that significantly impair their quality of life. The major skeletal complications associated with bone metastases include: cancer-induced bone pain, hypercalcemia, pathological bone fractures, metastatic epidural spinal cord compression and cancer cachexia. Once cancer cells invade the bone, they perturb the normal physiology of the marrow microenvironment, resulting in bone destruction, which is believed to be a direct cause of skeletal complications. However, full understanding of the mechanisms responsible for these complications remains unknown. In the present review, we discuss the complications associated with bone metastases along with matched conventional therapeutic strategies. A better understanding of this topic is crucial, as targeting skeletal complications can improve both the morbidity and mortality of patients suffering from bone metastases.
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Affiliation(s)
- Shunsuke Tsuzuki
- Department of Cancer Biology and Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Sun Hee Park
- Department of Cancer Biology and Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Matthew R Eber
- Department of Cancer Biology and Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Christopher M Peters
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Yusuke Shiozawa
- Department of Cancer Biology and Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA.
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Regan JN, Waning DL, Guise TA. Skeletal muscle Ca(2+) mishandling: Another effect of bone-to-muscle signaling. Semin Cell Dev Biol 2015; 49:24-9. [PMID: 26593325 DOI: 10.1016/j.semcdb.2015.11.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 11/13/2015] [Indexed: 01/06/2023]
Abstract
Our appreciation of crosstalk between muscle and bone has recently expanded beyond mechanical force-driven events to encompass a variety of signaling factors originating in one tissue and communicating to the other. While the recent identification of new 'myokines' has shifted some focus to the role of muscle in this partnership, bone-derived factors and their effects on skeletal muscle should not be overlooked. This review summarizes some previously known mediators of bone-to-muscle signaling and also recent work identifying a new role for bone-derived TGF-β as a cause of skeletal muscle weakness in the setting of cancer-induced bone destruction. Oxidation of the ryanodine receptor/calcium release channel (RyR1) in skeletal muscle occurs via a TGF-β-Nox4-RyR1 axis and leads to calcium mishandling and decreased muscle function. Multiple points of potential therapeutic intervention were identified, from preventing the bone destruction to stabilizing the RYR1 calcium channel. This new data reinforces the concept that bone can be an important source of signaling factors in pathphysiological settings.
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Affiliation(s)
- Jenna N Regan
- Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - David L Waning
- Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Theresa A Guise
- Indiana University School of Medicine, Indianapolis, IN 46202, USA.
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Cancer-associated muscle weakness: What's bone got to do with it? BONEKEY REPORTS 2015; 4:691. [PMID: 25992285 DOI: 10.1038/bonekey.2015.59] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 03/20/2015] [Indexed: 12/17/2022]
Abstract
Cancer-associated muscle weakness is an important paraneoplastic syndrome for which there is currently no treatment. Tumor cells commonly metastasize to bone in advanced cancer to disrupt normal bone remodeling and result in morbidity that includes muscle weakness. Tumor in bone stimulates excessive osteoclast activity, which causes the release of growth factors stored in the mineralized bone matrix. These factors fuel a feed-forward vicious cycle of tumor growth in bone and bone destruction. Recent evidence indicates that these bone-derived growth factors can act systemically to cause muscle weakness. Muscle weakness can be caused by reduced muscle mass or reduced muscle function; in advanced disease, it is likely due to a combination of both reduced quantity and quality of muscle. In this review, we discuss possible mechanisms that lead to skeletal muscle weakness due to bone metastases.
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Sugii H, Maeda H, Tomokiyo A, Yamamoto N, Wada N, Koori K, Hasegawa D, Hamano S, Yuda A, Monnouchi S, Akamine A. Effects of Activin A on the phenotypic properties of human periodontal ligament cells. Bone 2014; 66:62-71. [PMID: 24928494 DOI: 10.1016/j.bone.2014.05.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 04/30/2014] [Accepted: 05/07/2014] [Indexed: 02/05/2023]
Abstract
Periodontal ligament (PDL) tissue plays an important role in tooth preservation by structurally maintaining the connection between the tooth root and the bone. The mechanisms involved in the healing and regeneration of damaged PDL tissue, caused by bacterial infection, caries and trauma, have been explored. Accumulating evidence suggests that Activin A, a member of the transforming growth factor-β (TGF-β) superfamily and a dimer of inhibinβa, contributes to tissue healing through cell proliferation, migration, and differentiation of various target cells. In bone, Activin A has been shown to exert an inhibitory effect on osteoblast maturation and mineralization. However, there have been no reports examining the expression and function of Activin A in human PDL cells (HPDLCs). Thus, we aimed to investigate the biological effects of Activin A on HPDLCs. Activin A was observed to be localized in HPDLCs and rat PDL tissue. When PDL tissue was surgically damaged, Activin A and IL-1β expression increased and the two proteins were shown to be co-localized around the lesion. HPDLCs treated with IL-1β or TNF-α also up-regulated the expression of the gene encoding inhibinβa. Activin A promoted chemotaxis, migration and proliferation of HPDLCs, and caused an increase in fibroblastic differentiation of these cells while down-regulating their osteoblastic differentiation. These osteoblastic inhibitory effects of Activin A, however, were only noted during the early phase of HPDLC osteoblastic differentiation, with later exposures having no effect on differentiation. Collectively, our results suggest that Activin A could be used as a therapeutic agent for healing and regenerating PDL tissue in response to disease, trauma or surgical reconstruction.
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Affiliation(s)
- Hideki Sugii
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hidefumi Maeda
- Department of Endodontology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | - Atsushi Tomokiyo
- Colgate Australian Clinical Dental Research Centre, School of Dentistry, University of Adelaide, SA 5005, Australia
| | - Naohide Yamamoto
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan
| | - Naohisa Wada
- Department of Endodontology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Katsuaki Koori
- Department of Endodontology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Daigaku Hasegawa
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan
| | - Sayuri Hamano
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan
| | - Asuka Yuda
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan
| | - Satoshi Monnouchi
- Department of Endodontology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Akifumi Akamine
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Higashi-ku, Fukuoka 812-8582, Japan; Department of Endodontology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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Waning DL, Guise TA. Molecular mechanisms of bone metastasis and associated muscle weakness. Clin Cancer Res 2014; 20:3071-7. [PMID: 24677373 DOI: 10.1158/1078-0432.ccr-13-1590] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Bone is a preferred site for breast cancer metastasis and leads to pathologic bone loss due to increased osteoclast-induced bone resorption. The homing of tumor cells to the bone depends on the support of the bone microenvironment in which the tumor cells prime the premetastatic niche. The colonization and growth of tumor cells then depend on adaptations in the invading tumor cells to take advantage of normal physiologic responses by mimicking bone marrow cells. This concerted effort by tumor cells leads to uncoupled bone remodeling in which the balance of osteoclast-driven bone resorption and osteoblast-driven bone deposition is lost. Breast cancer bone metastases often lead to osteolytic lesions due to hyperactive bone resorption. Release of growth factors from bone matrix during resorption then feeds a "vicious cycle" of bone destruction leading to many skeletal-related events. In addition to activity in bone, some of the factors released during bone resorption are also known to be involved in skeletal muscle regeneration and contraction. In this review, we discuss the mechanisms that lead to osteolytic breast cancer bone metastases and the potential for cancer-induced bone-muscle cross-talk leading to skeletal muscle weakness.
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Affiliation(s)
- David L Waning
- Authors' Affiliation: Division of Endocrinology, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Theresa A Guise
- Authors' Affiliation: Division of Endocrinology, Department of Medicine, Indiana University, Indianapolis, Indiana
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Gajos-Michniewicz A, Piastowska AW, Russell JA, Ochedalski T. Follistatin as a potent regulator of bone metabolism. Biomarkers 2010; 15:563-74. [PMID: 20569048 DOI: 10.3109/1354750x.2010.495786] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Follistatin is a monomeric glycoprotein, distributed in a wide range of tissues. Recent work has demonstrated that this protein is a pluripotential molecule that has no structural similarity but is functionally associated with members of the transforming growth factor (TGF)-β superfamily, which indicates its wide range of action. Members of the TGF-β superfamily, especially activins and bone morphogenetic proteins are involved in bone metabolism. They play an important role in bone physiology, influencing bone growth, turnover, bone formation and cartilage induction. As follistatin is considered to be the antagonist of the TGF-β superfamily members, it plays an important role in bone metabolism and development.
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Affiliation(s)
- A Gajos-Michniewicz
- Department of Comparative Endocrinology, Medical University of Lodz, Poland.
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20
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Flanagan JN, Linder K, Mejhert N, Dungner E, Wahlen K, Decaunes P, Rydén M, Björklund P, Arver S, Bhasin S, Bouloumie A, Arner P, Dahlman I. Role of follistatin in promoting adipogenesis in women. J Clin Endocrinol Metab 2009; 94:3003-9. [PMID: 19470636 PMCID: PMC3214594 DOI: 10.1210/jc.2008-2005] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Follistatin is a glycoprotein that binds and neutralizes biological activities of TGFbeta superfamily members including activin and myostatin. We previously identified by expression profiling that follistatin levels in white adipose tissue (WAT) were regulated by obesity. OBJECTIVE The objective of the study was to elucidate the role of follistatin in human WAT and obesity. DESIGN We measured secreted follistatin protein from WAT biopsies and fat cells in vitro. We also quantified follistatin mRNA expression in sc and visceral WAT and in WAT-fractionated cells and related it to obesity status, body region, and cellular origin. We investigated the effects of follistatin on adipocyte differentiation of progenitor cells in vitro. PARTICIPANTS Women (n = 66) with a wide variation in body mass index were recruited by advertisement and from a clinic for weight-reduction therapy. RESULTS WAT secreted follistatin in vitro. Follistatin mRNA levels in sc but not visceral WAT were decreased in obesity and restored to nonobese levels after weight reduction. Follistatin mRNA levels were high in the stroma-vascular fraction of WAT and low in adipocytes. Recombinant follistatin treatment promoted adipogenic differentiation of progenitor cells and neutralized the inhibitory action of myostatin on differentiation in vitro. Moreover, activin and myostatin signaling receptors were detected in WAT and adipocytes. CONCLUSION Follistatin is a new adipokine important for adipogenesis. Down-regulated WAT expression of follistatin in obesity may counteract adiposity but could, by inhibiting adipogenesis, contribute to hypertrophic obesity (large fat cells) and insulin resistance.
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Affiliation(s)
- John N Flanagan
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
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Karim N, MacDonald D, Dolan AL, Fogelman I, Wierzbicki AS, Hampson G. The relationship between gonadotrophins, gonadal hormones and bone mass in men. Clin Endocrinol (Oxf) 2008; 68:94-101. [PMID: 17760881 DOI: 10.1111/j.1365-2265.2007.03005.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Inhibin A and B (Inh A and B), activin A (Act A) as well as FSH may play an important role in bone turnover in perimenopausal women. Data in men are lacking. The aim was to investigate the relationship between circulating concentrations of Inh B and Act A and FSH/LH/testosterone (T) and their contribution to bone mineral density (BMD) in a male population. DESIGN AND SUBJECTS Cross-sectional case-control study of 156 men, 63 with osteoporosis and 93 controls, aged (mean [SD]) 57.7 [13.7] years. MEASUREMENTS Areal (aBMD) was measured at the femoral neck, total hip and lumbar spine. Volumetric BMD (vBMD) was calculated at the femoral neck and lumbar spine. Risk factors were assessed including the measurement of LH/FSH/T, Inh B and Act A. RESULTS After correction for age and body mass index (BMI), associations were found between Inh B and FSH (beta regression coefficient beta = -0.326; P < 0.0001), T (beta = -0.36; P = 0.019) and Act A (beta = -0.4; P = 0.007) and between Inh B and LH (beta = 0.23; P < 0.0001) in all patients. The controls had higher Inh B concentrations compared to the cases (Inh B: controls: 139 [86] pg/ml vs. cases 88 [51] pg/ml; P = 0.005). Act A tended to be lower in the controls (Act A: controls 0.63 [0.24] ng/ml vs. cases 0.75 [0.4] ng/ml; P = 0.056). Univariate regression analyses showed a positive association between Inh B and BMD (P < 0.01) at the lumbar spine and total hip. In contrast a negative association was seen between FSH and BMD at the lumbar spine and femoral neck (P < 0.01). In a partial multivariate regression model that included the gonadal factors only, a positive association was seen between Inh B and BMD at the hip (beta = 0.088; P = 0.04). When all hormones including the gonadotrophins were entered in a full multivariate model, FSH and LH were found to be better predictors of BMD than Inh B or Act A in the controls and cases. CONCLUSIONS These data suggest that the gonadal peptides and gonadotrophins may play a role in the maintenance of bone mass in men. Future confirmatory longitudinal studies are needed.
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Affiliation(s)
- N Karim
- Department of Chemical Pathology, St Thomas Hospital, London, UK
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Rausch-fan X, Qu Z, Wieland M, Matejka M, Schedle A. Differentiation and cytokine synthesis of human alveolar osteoblasts compared to osteoblast-like cells (MG63) in response to titanium surfaces. Dent Mater 2008; 24:102-10. [PMID: 17467048 DOI: 10.1016/j.dental.2007.03.001] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2006] [Revised: 02/25/2007] [Accepted: 03/05/2007] [Indexed: 10/23/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the influence of different implant surface topographies and chemistries on the expression of differentiation/proliferation markers on MG63 cells and primary human alveolar osteoblasts. METHODS Hydrophobic acid-etched (A) and hydrophobic coarse-grit-blasted, acid-etched (SLA) surfaces and hydrophilic acid-etched (modA) and hydrophilic coarse-grit-blasted (modSLA) surfaces were produced. Thereby, modA and modSLA surfaces were rinsed under nitrogen protection and stored in a sealed glass tube containing isotonic NaCl solution at pH 4-6. Tissue culture plates without specimens served as controls. The behavior of MG63 cells and primary human alveolar osteoblasts (AOB) grown on all surfaces was compared through determination of alkaline phosphatase (ALP) activity, cell proliferation ((3)H-thymidin incorporation, MTT colorimetric assay) and expression of osteocalcin (OC), osteoprotegerin (OPG), transforming growth factor-beta1 (TGF-beta(1)) and vascular endothelial growth factor (VEGF), detected with commercial available test kits. RESULTS Proliferation of MG63 and primary cells was highest on controls, followed by A surfaces, modA and SLA surfaces being almost on the same level and lowest on modSLA surfaces. modSLA surfaces exhibited highest ALP and OC production, followed by SLA, modA and A surfaces. Proliferation and OC production were comparable for MG63 cells and AOB. OPG, TGF-beta(1) and VEGF produced on primary cells showed a slightly different rank order on different surfaces compared to MG63 cells. modSLA still showed the highest production of OPG, TGF-beta(1) and VEGF, but was followed by modA, SLA and A. Statistical significance was checked by ANOVA (p<0.0035). SIGNIFICANCE MG63 cells and primary human alveolar osteoblasts showed similar proliferation and differentiation characteristics on different titanium surfaces. Only modA surfaces showed enhanced expression of OPG, TGF-beta(1) and VEGF on MG63 cells compared to primary human alveolar osteoblasts. Overall, the lowest proliferation rates and the highest expressions of differentiation markers and growth factor productions were observed on modSLA.
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Affiliation(s)
- Xiaohui Rausch-fan
- Department of Periodontology, Bernhard Gottlieb University Clinic of Dentistry, Medical University of Vienna, Währingerstrasse 25a, Vienna, Austria
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Kawabata N, Kamiya N, Suzuki N, Matsumoto M, Takagi M. Changes in extracellular activin A:follistatin ratio during differentiation of a mesenchymal progenitor cell line, ROB-C26 into osteoblasts and adipocytes. Life Sci 2007; 81:8-18. [PMID: 17512555 DOI: 10.1016/j.lfs.2007.04.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Revised: 03/16/2007] [Accepted: 04/12/2007] [Indexed: 11/22/2022]
Abstract
We investigated the effects of BMP-2 and dexamethasone (Dex) on follistatin (FS) and activin A expressions in a mesenchymal progenitor cell line, ROB-C26 (C26). C26 cells stimulated to differentiate into osteoblastic cells by blocking myogenic differentiation after BMP-2 treatment and into adipocytes with Dex treatment. Alkaline phosphatase (ALP) mRNA expression and its activity in the confluent C26 cells were dose- and time-dependently stimulated by BMP-2, but inhibited by Dex. The stimulatory effect on FS and activin A mRNA expressions by BMP-2 and Dex were dose-dependent. Cycloheximide pre-treatment indicated that FS and activin A expressions appear to be the direct target of BMP-2 and Dex signaling. BMP-2 time-dependently increased FS and activin A levels. Dex also increased FS level, but induced a time-dependent biphasic effect on activin A level, a decrease (2-6 h) followed by an increase (12-72 h). The data of the ratio of activin A concentration in the culture media to that of FS (activin A:FS ratio) measured by ELISA showed that BMP-2-induced osteoblastic differentiation involved an activin-dominant microenvironment, whereas Dex-induced adipocyte differentiation involved a FS-dominant microenvironment. Excess FS suppressed the stimulatory ALP activity of BMP-2, whereas activin A prevented not only Dex-induced inhibitory ALP activity, but also adipogenesis via suppression of the adipocyte transcriptional factor cascade. These results indicate that BMP-2-induced activin-dominant microenvironment may be critical for osteoblastic differentiation by restricting the antagonistic effects of FS on BMP activity, while Dex-induced FS-dominant microenvironment may be critical for adipocyte differentiation by restricting the inhibitory action of activin A on adipocyte differentiation.
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Affiliation(s)
- Niki Kawabata
- Department of Oral and Maxillofacial Surgery Nihon University School of Dentistry, Tokyo 101-8310, Japan
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Eijken M, Swagemakers S, Koedam M, Steenbergen C, Derkx P, Uitterlinden AG, van der Spek PJ, Visser JA, de Jong FH, Pols HAP, van Leeuwen JPTM. The activin A-follistatin system: potent regulator of human extracellular matrix mineralization. FASEB J 2007; 21:2949-60. [PMID: 17449718 DOI: 10.1096/fj.07-8080com] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Bone quality is an important determinant of osteoporosis, and proper osteoblast differentiation plays an important role in the control and maintenance of bone quality. We investigated the impact of activin signaling on human osteoblast differentiation, extracellular matrix formation, and mineralization. Activins belong to the transforming growth factor-beta superfamily and activin A treatment strongly inhibited mineralization in osteoblast cultures, whereas the activin antagonist follistatin increased mineralization. Osteoblasts produced activin A and follistatin in a differentiation-dependent manner, leading to autocrine regulation of extracellular matrix formation and mineralization. In addition, mineralization in a vascular smooth muscle cell-based model for pathological calcification was inhibited. Comparative activin A and follistatin gene expression profiling showed that activin signaling changes the expression of a specific range of extracellular matrix proteins prior to the onset of mineralization, leading to a matrix composition with reduced or no mineralizing capacity. These findings demonstrate the regulation of osteoblast differentiation and matrix mineralization by the activin A-follistatin system, providing the possibility to control bone quality as well as pathological calcifications such as atherosclerosis by using activin A, follistatin, or analogs thereof.
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Affiliation(s)
- Marco Eijken
- Erasmus MC, Department Internal Medicine, 3000 CA, Rotterdam, The Netherlands
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25
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Lelong C, Badariotti F, Le Quéré H, Rodet F, Dubos MP, Favrel P. Cg-TGF-beta, a TGF-beta/activin homologue in the Pacific Oyster Crassostrea gigas, is involved in immunity against Gram-negative microbial infection. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2007; 31:30-8. [PMID: 16820208 DOI: 10.1016/j.dci.2006.05.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2006] [Revised: 05/02/2006] [Accepted: 05/05/2006] [Indexed: 05/10/2023]
Abstract
Transforming growth factor-beta (TGF-beta) members represent a widespread protein superfamily in the animal kingdom, but few members have been characterised in lophotrochozoans, a major clade of invertebrates. Here, we report the identification of Crassostrea gigas-TGF-beta (Cg-TGF-beta), a homologue of vertebrate TGF-beta and activin, from the bivalve mollusc C. gigas. Phylogenetic analysis suggests an early ancestral origin of this subgroup of TGF-beta superfamily member. Investigation of the spatio-temporal expression of Cg-TGF-beta gene by real-time quantitative RT-PCR showed a ubiquitous pattern in all adult tissues. These findings imply that Cg-TGF-beta has multiple functions as described for its vertebrate counterparts. Moreover, Cg-TGF-beta was upregulated in haemocytes during infection by a Gram-negative bacterium, suggesting that it could act as a cytokine involved in immunity in molluscs.
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Affiliation(s)
- C Lelong
- Laboratoire de Biologie et de Biotechnologies Marines, IBFA, EA 962-UMR 100 I.FR.E.MER, Physiologie et Ecophysiologie des Mollusques Marins, Université de Caen-Basse Normandie, Esplanade de la Paix, 14032 CAEN Cedex, France.
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Leto G, Incorvaia L, Badalamenti G, Tumminello FM, Gebbia N, Flandina C, Crescimanno M, Rini G. Activin A circulating levels in patients with bone metastasis from breast or prostate cancer. Clin Exp Metastasis 2006; 23:117-22. [PMID: 16841234 DOI: 10.1007/s10585-006-9010-5] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Accepted: 04/10/2006] [Indexed: 10/24/2022]
Abstract
Recent studies have highlighted that Activin A, a member of the transforming growth factor-beta (TGF-beta) superfamily, may be involved in the regulation of osteoblastic activity and in osteoclast differentiation. Therefore, we have investigated the clinical significance of its circulating levels in patients with bone metastasis. Activin A serum concentrations were determined, by a commercially available enzyme-linked immunosorbent assay kit, in 72 patients with breast cancer (BC) or prostatic cancer (PC) with (BM+) or without (BM-) bone metastases, in 15 female patients with age-related osteoporosis (OP), in 20 patients with benign prostatic hypertrophy (BPH) and in 48 registered healthy blood donors (HS) of both sex (25 female and 23 male). Activin A serum concentrations were significantly increased in BC or PC patients as compared to OP (P < 0.0001) or BPH (P = 0.045), respectively, or to sex matched HS (P < 0.0001). Additionally, these levels resulted more elevated in PC patients as compared to BC patients (P = 0.032). Interestingly, Activin A was significantly higher in BM+ patients than in BM- patients (BC, P = 0.047; PC, P = 0.016). In BC patients, a significant correlation was observed only between Activin A and number of bone metastases (P = 0.0065) while, in PC patients, Activin A levels were strongly correlated with the Gleason score (P = 0.011) or PSA levels (P = 0.0001) and, to a lessen extent, with the number of bone metastases (P = 0.056). Receiver operating characteristic curve (ROC) analysis showed a fair diagnostic accuracy of Activin A to discriminate between BM+ and BM- patients (BC: AUC = 0.71 +/- 0.09, P = 0.03; PC: AUC = 0.73 +/- 0.081, P = 0.005). These findings indicate that Activin A may be implicated in the pathogenesis of bone metastasis. Therefore, this cytokine may be considered a novel potential target for a more selective therapeutic approach in the treatment of skeletal metastasis and may be also useful as additional biochemical marker of metastatic bone disease.
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Affiliation(s)
- Gaetano Leto
- Laboratory of Experimental Chemotherapy, Department of Surgery and Oncology, Policlinico Universitario P Giaccone, Via del Vespro 129, 90127, Palermo, Italy.
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Borawski J, Naumnik B, Myśliwiec M. Activin A/follistatin system: another link to heparin-induced osteoporosis? Clin Appl Thromb Hemost 2004; 10:191-2. [PMID: 15094943 DOI: 10.1177/107602960401000213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Abe Y, Abe T, Aida Y, Hara Y, Maeda K. Follistatin restricts bone morphogenetic protein (BMP)-2 action on the differentiation of osteoblasts in fetal rat mandibular cells. J Bone Miner Res 2004; 19:1302-7. [PMID: 15231018 DOI: 10.1359/jbmr.040408] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2003] [Revised: 11/26/2003] [Accepted: 04/30/2004] [Indexed: 11/18/2022]
Abstract
UNLABELLED We tested whether FS secretion might modulate BMP-2 actions by measuring FS levels and counting bone numbers of rat mandibular cells. In the presence of Dex, BMP-2 stimulated FS secretion at the early phase and augmented bone nodule by neutralizing with FS antibody. We concluded that BMP-2 facilitates FS secretion, and the FS restricts BMP-2 action on osteoblastogenesis. INTRODUCTION Bone morphogenetic proteins (BMPs) promote the differentiation of osteoprogenitor cells into osteoblasts. Activin A is involved in the regulation of bone formation. Follistatin (FS) antagonizes the bioactivities of BMP and activin A extracellularly. MATERIALS AND METHODS In this study, we tested whether the induction of FS secretion might modulate the effects of BMP-2 on osteoblast development, using the bone nodule-forming cultures of fetal rat mandibular cells. RESULTS AND CONCLUSIONS In the presence of dexamethasone (Dex), BMP-2 stimulated the secretion of FS at the early phase (days 3-9) of the culture. Dex alone had no effect, and BMP-2 alone was less effective than the combination of the two. BMP-4 and -6 had little effect on FS secretion. Activin A inhibited the early upregulation of FS secretion when added with BMP-2 and Dex. In the presence of Dex, BMP-2 increased bone nodule numbers when added to early cultures. The addition of anti-FS antibody to cultures with BMP-2 and Dex augmented bone nodule formation. These results show that BMP-2 facilitates the secretion of FS in the presence of Dex, and the increased FS secretion restricts the action of BMP-2 on osteoblast differentiation.
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Affiliation(s)
- Yukiko Abe
- Division of Periodontology, Department of Developmental and Reconstructive Medicine, Course of Medical and Dental Sciences, Nagasaki University Graduate School, Nagasaki, Japan.
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Borawski J, Naumnik B, Myśliwiec M. Activation of hepatocyte growth factor/activin A/follistatin system during hemodialysis: Role of heparin. Kidney Int 2003; 64:2229-37. [PMID: 14633147 DOI: 10.1046/j.1523-1755.2003.00307.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Hepatocyte growth factor (HGF), activin A, and follistatin compose an organotrophic system that may be modulated by heparin. We prospectively studied the effects of unfractionated heparin (UFH) versus low-molecular-weight heparin (LMWH) enoxaparin-anticoagulated hemodialysis on plasma levels of the cytokines. METHODS The factors were measured by immunoassays in 25 chronic hemodialysis patients at the start and at 10 and 180 minutes of the hemodialysis procedure anticoagulated with bolus enoxaparin. Then, the patients were randomized to either receive a bolus and infusion of UFH or to continue LMWH, and were reexamined after 12 weeks. RESULTS Predialysis HGF and follistatin were increased (both P < 0.0001), while activin A was normal in hemodialysis patients. Baseline HGF directly correlated with activin A in hemodialysis subjects (P=0.004). In healthy controls, it was positively associated with follistatin (P=0.001). Both HGF and activin A were markedly increased at each interval of enoxaparin-anticoagulated hemodialysis, and follistatin was increased at 10 minutes (all P < 0.0001). The early increments in HGF and follistatin directly depended on the dose of enoxaparin (both P < 0.030). Remarkably, the rise in activin A was inversely associated with the predialysis level of the cytokine (P < 0.0001). The actions of UFH resembled those of LMWH, although the releasing effects on the growth factors were not dose-dependent. The switch from LMWH to UFH resulted in a significant increase in over-dialysis HGF, a fall in follistatin, and no change in activin A. CONCLUSION HGF/activin A/follistatin system is activated and disturbed in chronic hemodialysis patients, including depletion of tissue stores of activin A. Type and dose of heparin used during hemodialysis procedures profoundly influence this pleiotropic system, and may thus modulate vital body functions and course of critical diseases.
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Affiliation(s)
- Jacek Borawski
- Department of Nephrology and Internal Medicine, Medical University, Białystok, Poland.
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Liu QH, Li DG, Huang X, You HN, Pan Q, Xu LM, Xu QF, Lu HM. Effect of Activin on extracelluar matrix secretion in isolated rat hepatic stellate cell. Shijie Huaren Xiaohua Zazhi 2003; 11:745-748. [DOI: 10.11569/wcjd.v11.i6.745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the effect of activin A on the extracelluar matrix secretion of rat hepatic stellate cell.
METHODS Hepatic stellate cells were isolated and purified from normal male Sprague-Dawley rat liver by a combination of pronase-collagenase perfusion and density gradient centrifugation. Passaged hepatic stellate cells were divided randomly into eight groups: control group(A group), ACTA 1 μg/L group (B group), ACTA 10 μg/L group(C group), ACTA 100 μg/L group (D group), TGF β1 10 μg/L group(E group), TGF β1 10 μg/L plus ACTA 1 μg/L group(F group), TGF β1 10 μg/L plus ACTA 10 μg/L group(G group), TGF β1 10 μg/L plus ACTA 100 μg/L group(H group). 24 h after incubation secretion of procollagen Ⅲ, collagen Ⅳ and mRNA of collagen Ⅲ in hepatic stellate cells were detected by radioimmunoassays and semi-quantitative RT-PCR method respectively.
RESULTS Extracellular matrix secretion in passaged hepatic stellate cells was enhanced by activin A according to its concentration, the capacity of extracellular matrix secretion by 100 μg/L activin A was equal to that of 10 μg/L TGF β1, extracellular matrix secretion and type Ⅲ collagen mRNA expression in passaged hepatic stellate cells was enhanced by activin A and TGFβ1 in a synergistic manner.
CONCLUSION Activin A may contribute to hepatic fibrogenesis.
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Affiliation(s)
- Qing-Hua Liu
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Ding-Guo Li
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Xin Huang
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Han-Ning You
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Qin Pan
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Lei-Ming Xu
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Qin-Fang Xu
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
| | - Han-Ming Lu
- Department of Gastroenterology of Xinhua Hospital, Shanghai Second Medical University, Shanghai 200092, China
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Abstract
Activin A, a cytokine member of the transforming growth factor-beta superfamily, is expressed locally by the mesenchymal component of the hemopoietic microenvironment. Its expression is regulated on the mRNA level by different cytokines, and the biological activity of the protein is tightly controlled by several inhibitory molecules. Activin A affects hemopoietic cells of various lineages, as evidenced by in vitro studies of leukemia and lymphoma cell lines, which were used to elucidate the mechanism of its action. In the B-cell lineage, activin A is a cell cycle inhibitor, a mediator of apoptosis, and a cytokine antagonist. Limited information is available on the effects of activin A on normal hemopoietic cells. Recent studies suggest that it might be a negative regulator of normal B lymphopoiesis. Whereas the functions of activin A in vitro are well established, further research tools are needed to elucidate its role within specific hemopoietic microenvironments in vivo.
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Affiliation(s)
- Yaron Shav-Tal
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
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Welt C, Sidis Y, Keutmann H, Schneyer A. Activins, inhibins, and follistatins: from endocrinology to signaling. A paradigm for the new millennium. Exp Biol Med (Maywood) 2002; 227:724-52. [PMID: 12324653 DOI: 10.1177/153537020222700905] [Citation(s) in RCA: 237] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
It has been 70 years since the name inhibin was used to describe a gonadal factor that negatively regulated pituitary hormone secretion. The majority of this period was required to achieve purification and definitive characterization of inhibin, an event closely followed by identification and characterization of activin and follistatin (FS). In contrast, the last 15-20 years saw a virtual explosion of information regarding the biochemistry, physiology, and biosynthesis of these proteins, as well as identification of activin receptors, and a unique mechanism for FS action-the nearly irreversible binding and neutralization of activin. Many of these discoveries have been previously summarized; therefore, this review will cover the period from the mid 1990s to present, with particular emphasis on emerging themes and recent advances. As the field has matured, recent efforts have focused more on human studies, so the endocrinology of inhibin, activin, and FS in the human is summarized first. Another area receiving significant recent attention is local actions of activin and its regulation by both FS and inhibin. Because activin and FS are produced in many tissues, we chose to focus on a few particular examples with the most extensive experimental support, the pituitary and the developing follicle, although nonreproductive actions of activin and FS are also discussed. At the cellular level, it now seems that activin acts largely as an autocrine and/or paracrine growth factor, similar to other members of the transforming growh factor beta superfamily. As we discuss in the next section, its actions are regulated extracellularly by both inhibin and FS. In the final section, intracellular mediators and modulators of activin signaling are reviewed in detail. Many of these are shared with other transforming growh factor beta superfamily members as well as unrelated molecules, and in a number of cases, their physiological relevance to activin signal propagation remains to be elucidated. Nevertheless, taken together, recent findings suggest that it may be more appropriate to consider a new paradigm for inhibin, activin, and FS in which activin signaling is regulated extracellularly by both inhibin and FS whereas a number of intracellular proteins act to modulate cellular responses to these activin signals. It is therefore the balance between activin and all of its modulators, rather than the actions of any one component, that determines the final biological outcome. As technology and model systems become more sophisticated in the next few years, it should become possible to test this concept directly to more clearly define the role of activin, inhibin, and FS in reproductive physiology.
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Affiliation(s)
- Corrine Welt
- Reproductive Endocrine Unit and Endocrine Unit, Massachusetts General Hospital, Boston 02114, USA
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