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Escudero DS, Fantinelli JC, Martínez VR, González Arbeláez LF, Amarillo ME, Pérez NG, Díaz RG. Hydrocortisone cardioprotection in ischaemia/reperfusion injury involves antioxidant mechanisms. Eur J Clin Invest 2024; 54:e14172. [PMID: 38293760 DOI: 10.1111/eci.14172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/22/2023] [Accepted: 01/12/2024] [Indexed: 02/01/2024]
Abstract
BACKGROUND Glucocorticoid (GR) and mineralocorticoid (MR) receptors are highly expressed in cardiac tissue, and both can be activated by corticosteroids. MR activation, in acute myocardial infarction (AMI), worsens cardiac function, and increase NHE activity contributing to the deleterious process. In contrast, effects of GR activation are not fully understood, probably because of the controversial scenario generated by using different doses or potencies of corticosteroids. AIMS We tested the hypothesis that an acute dose of hydrocortisone (HC), a low-potency glucocorticoid, in a murine model of AMI could be cardioprotective by regulating NHE1 activity, leading to a decrease in oxidative stress. MATERIALS AND METHODS Isolated hearts from Wistar rats were subjected to regional ischemic protocol. HC (10 nmol/L) was added to the perfusate during early reperfusion. Infarct size and oxidative stress were determined. Isolated papillary muscles from non-infarcted hearts were used to evaluate HC effect on sodium-proton exchanger 1 (NHE1) by analysing intracellular pH recovery from acute transient acidosis. RESULTS HC treatment decreased infarct size, improved cardiac mechanics, reduced oxidative stress after AMI, while restoring the decreased level of the pro-fusion mitochondrial protein MFN-2. Co-treatment with the GR-blocker Mifepristone avoided these effects. HC reduced NHE1 activity by increasing the NHE1 pro-inhibiting Ser648 phosphorylation site and its upstream kinase AKT. HC restored the decreased AKT phosphorylation and anti-apoptotic BCL-2 protein expression detected after AMI. CONCLUSIONS Our results provide the first evidence that acute HC treatment during early reperfusion induces cardioprotection against AMI, associated with a non-genomic HC-triggered NHE1 inhibition by AKT and antioxidant action that might involves mitochondrial dynamics improvement.
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Affiliation(s)
- Daiana S Escudero
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Established Investigator of Comisión de Investigaciones Científicas (CIC), Buenos Aires, Argentina
| | - Juliana C Fantinelli
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Established Investigators of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Valeria R Martínez
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Established Investigators of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Luisa F González Arbeláez
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Established Investigators of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - María E Amarillo
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Fellow of Agencia Nacional de Promoción Científica y Tecnológica (Agencia I+D+i), Buenos Aires, Argentina
| | - Néstor G Pérez
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Established Investigators of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Romina G Díaz
- Centro de Investigaciones Cardiovasculares 'Dr. Horacio E. Cingolani', Facultad de Ciencias Médicas de La Plata, Universidad Nacional de La Plata, La Plata, Argentina
- Established Investigators of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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2
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Costa DM, da Silva RP, da Cruz-Filho J, de Oliveira Santos T, Dos Anjos-Santos HC, de Lucca W, do Carmo Kettelhut Í, Navegantes LC, de Souza PRM, Camargo EA, Lauton-Santos S, Badauê-Passos D, Mecawi AS, DeSantana JM, Lustrino D. Adrenalectomy attenuates hyperalgesia but does not regulate muscle wasting in a female rat model of fibromyalgia. Clin Exp Pharmacol Physiol 2024; 51:e13837. [PMID: 38302081 DOI: 10.1111/1440-1681.13837] [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: 10/10/2023] [Revised: 11/16/2023] [Accepted: 12/03/2023] [Indexed: 02/03/2024]
Abstract
Although it is well established that fibromyalgia (FM) syndrome is characterized by chronic diffuse musculoskeletal hyperalgesia, very little is known about the effect of this pathology on muscle tissue plasticity. Therefore, the present study aimed to characterize the putative alterations in skeletal muscle mass in female rats subjected to a FM model by inducing chronic diffuse hyperalgesia (CDH) through double injections of acidic saline (pH 4.0) into the left gastrocnemius muscle at 5-day intervals. To determine protein turnover, the total proteolysis, proteolytic system activities and protein synthesis were evaluated in oxidative soleus muscles of pH 7.2 (control) and pH 4.0 groups at 7 days after CDH induction. All animals underwent behavioural analyses of mechanical hyperalgesia, strength and motor performance. Our results demonstrated that, in addition to hyperalgesia, rats injected with acidic saline exhibited skeletal muscle loss, as evidenced by a decrease in the soleus fibre cross-sectional area. This muscle loss was associated with increased proteasomal proteolysis and expression of the atrophy-related gene (muscle RING-finger protein-1), as well as reduced protein synthesis and decreased protein kinase B/S6 pathway activity. Although the plasma corticosterone concentration did not differ between the control and pH 4.0 groups, the removal of the adrenal glands attenuated hyperalgesia, but it did not prevent the increase in muscle protein loss in acidic saline-injected animals. The data suggests that the stress-related hypothalamic-pituitary-adrenal axis is involved in the development of hyperalgesia, but is not responsible for muscle atrophy observed in the FM model induced by intramuscular administration of acidic saline. Although the mechanisms involved in the attenuation of hyperalgesia in rats injected with acidic saline and subjected to adrenalectomy still need to be elucidated, the results found in this study suggest that glucocorticoids may not represent an effective therapeutic approach to alleviate FM symptoms.
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Affiliation(s)
- Daniely Messias Costa
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Raquel Prado da Silva
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - João da Cruz-Filho
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Tatiane de Oliveira Santos
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Hevely Catharine Dos Anjos-Santos
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Waldecy de Lucca
- Department of Morphology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Ísis do Carmo Kettelhut
- Department of Physiology and Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Luiz Carlos Navegantes
- Department of Physiology and Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | | | | | - Sandra Lauton-Santos
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Daniel Badauê-Passos
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - André Souza Mecawi
- Department of Biophysics, São Paulo Medical School, Federal University of São Paulo, São Paulo, Brazil
| | - Josimari Melo DeSantana
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
| | - Danilo Lustrino
- Laboratory of Basic and Behavioral Neuroendocrinology (LANBAC), Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Brazil
- Graduate Program in Physiological Sciences, Federal University of Sergipe, São Cristóvão, Brazil
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3
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James RS, Seebacher F, Tallis J. Can animals tune tissue mechanics in response to changing environments caused by anthropogenic impacts? J Exp Biol 2023; 226:287009. [PMID: 36779312 DOI: 10.1242/jeb.245109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Anthropogenic climate change and pollution are impacting environments across the globe. This Review summarises the potential impact of such anthropogenic effects on animal tissue mechanics, given the consequences for animal locomotor performance and behaviour. More specifically, in light of current literature, this Review focuses on evaluating the acute and chronic effects of temperature on the mechanical function of muscle tissues. For ectotherms, maximal muscle performance typically occurs at temperatures approximating the natural environment of the species. However, species vary in their ability to acclimate to chronic changes in temperature, which is likely to have longer-term effects on species range. Some species undergo periods of dormancy to avoid extreme temperature or drought. Whilst the skeletal muscle of such species generally appears to be adapted to minimise muscle atrophy and maintain performance for emergence from dormancy, the increased occurrence of extreme climatic conditions may reduce the survival of individuals in such environments. This Review also considers the likely impact of anthropogenic pollutants, such as hormones and heavy metals, on animal tissue mechanics, noting the relative paucity of literature directly investigating this key area. Future work needs to determine the direct effects of anthropogenic environmental changes on animal tissues and related changes in locomotor performance and behaviour, including accounting for currently unknown interactions between environmental factors, e.g. temperature and pollutants.
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Affiliation(s)
- Rob S James
- Faculty of Life Sciences, University of Bradford, Bradford BD7 1DP, UK
| | - Frank Seebacher
- School of Life and Environmental Sciences A08, University of Sydney, Sydney, NSW 2006, Australia
| | - Jason Tallis
- Research Centre for Sport, Exercise and Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK
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4
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Ahmad SS, Chun HJ, Ahmad K, Shaikh S, Lim JH, Ali S, Han SS, Hur SJ, Sohn JH, Lee EJ, Choi I. The roles of growth factors and hormones in the regulation of muscle satellite cells for cultured meat production. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2023; 65:16-31. [PMID: 37093925 PMCID: PMC10119461 DOI: 10.5187/jast.2022.e114] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/25/2022] [Accepted: 11/27/2022] [Indexed: 12/24/2022]
Abstract
Cultured meat is a potential sustainable food generated by the in vitro myogenesis of muscle satellite (stem) cells (MSCs). The self-renewal and differentiation properties of MSCs are of primary interest for cultured meat production. MSC proliferation and differentiation are influenced by a variety of growth factors such as insulin-like growth factors (IGF-1 and IGF-2), transforming growth factor beta (TGF-β), fibroblast growth factors (FGF-2 and FGF-21), platelet-derived growth factor (PDGF) and hepatocyte growth factor (HGF) and by hormones like insulin, testosterone, glucocorticoids, and thyroid hormones. In this review, we investigated the roles of growth factors and hormones during cultured meat production because these factors provide signals for MSC growth and structural stability. The aim of this article is to provide the important idea about different growth factors such as FGF (enhance the cell proliferation and differentiation), IGF-1 (increase the number of myoblasts), PDGF (myoblast proliferation), TGF-β1 (muscle repair) and hormones such as insulin (cell survival and growth), testosterone (muscle fiber size), dexamethasone (myoblast proliferation and differentiation), and thyroid hormones (amount and diameter of muscle fibers and determine the usual pattern of fiber distributions) as media components during myogenesis for cultured meat production.
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Affiliation(s)
- Syed Sayeed Ahmad
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
| | - Hee Jin Chun
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
| | - Khurshid Ahmad
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
| | - Sibhghatulla Shaikh
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
| | - Jeong Ho Lim
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
| | - Shahid Ali
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
| | - Sung Soo Han
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
- School of Chemical Engineering, Yeungnam
University, Gyeongsan 38541, Korea
| | - Sun Jin Hur
- Department of Animal Science and
Technology, Chung-Ang University, Anseong 17546, Korea
| | - Jung Hoon Sohn
- Synthetic Biology and Bioengineering
Research Center, Korea Research Institute of Bioscience and Biotechnology
(KRIBB), Daejeon 34141, Korea
| | - Eun Ju Lee
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
| | - Inho Choi
- Department of Medical Biotechnology,
Yeungnam University, Gyeongsan 38541, Korea
- Research Institute of Cell Culture,
Yeungnam University, Gyeongsan 38541, Korea
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5
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Non-genomic uterorelaxant actions of corticosteroid hormones in rats: An in vitro and in vivo study. Eur J Pharmacol 2022; 935:175346. [DOI: 10.1016/j.ejphar.2022.175346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 10/17/2022] [Accepted: 10/18/2022] [Indexed: 11/19/2022]
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6
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Adrenergic and Glucocorticoid Receptors in the Pulmonary Health Effects of Air Pollution. TOXICS 2021; 9:toxics9060132. [PMID: 34200050 PMCID: PMC8226814 DOI: 10.3390/toxics9060132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/28/2021] [Accepted: 05/31/2021] [Indexed: 01/16/2023]
Abstract
Adrenergic receptors (ARs) and glucocorticoid receptors (GRs) are activated by circulating catecholamines and glucocorticoids, respectively. These receptors regulate the homeostasis of physiological processes with specificity via multiple receptor subtypes, wide tissue-specific distribution, and interactions with other receptors and signaling processes. Based on their physiological roles, ARs and GRs are widely manipulated therapeutically for chronic diseases. Although these receptors play key roles in inflammatory and cellular homeostatic processes, little research has addressed their involvement in the health effects of air pollution. We have recently demonstrated that ozone, a prototypic air pollutant, mediates pulmonary and systemic effects through the activation of these receptors. A single exposure to ozone induces the sympathetic–adrenal–medullary and hypothalamic–pituitary–adrenal axes, resulting in the release of epinephrine and corticosterone into the circulation. These hormones act as ligands for ARs and GRs. The roles of beta AR (βARs) and GRs in ozone-induced pulmonary injury and inflammation were confirmed in a number of studies using interventional approaches. Accordingly, the activation status of ARs and GRs is critical in mediating the health effects of inhaled irritants. In this paper, we review the cellular distribution and functions of ARs and GRs, their lung-specific localization, and their involvement in ozone-induced health effects, in order to capture attention for future research.
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7
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Aravena-Canales D, Aedo JE, Molina A, Valdés JA. Regulation of the early expression of MAFbx/atrogin-1 and MuRF1 through membrane-initiated cortisol action in the skeletal muscle of rainbow trout. Comp Biochem Physiol B Biochem Mol Biol 2021; 253:110565. [PMID: 33497801 DOI: 10.1016/j.cbpb.2021.110565] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 12/18/2020] [Accepted: 01/13/2021] [Indexed: 11/17/2022]
Abstract
Glucocorticoids are key stress-related hormones in vertebrates, with cortisol being the main glucocorticoid in teleosts. Glucocorticoids exert their effects through two mechanisms of action: genomic/classic and membrane initiated. In mammals, cortisol-mediated stress has been found to be associated with increased expression of critical atrophy-related genes (atrogenes), such as MAFbx/atrogin-1 and murf1/trim63. However, the direct impact of cortisol on the early regulation of atrogene expression in teleost skeletal muscle and the contribution of membrane-initiated cortisol action to this process have not been identified. In this work, the mRNA levels of atrogin-1 and murf1 were assessed in isolated myotubes and skeletal muscle of rainbow trout administered with cortisol or cortisol-BSA. This latter compound is a membrane-impermeable cortisol analog that exclusively induces membrane-initiated effects. We found that cortisol (10 mg/kg) first decreased the expression of both atrogenes at 3 h of treatment and then increased their expression at 9 h of treatment in the skeletal muscle of rainbow trout. Additionally, the in vitro analysis suggested that membrane-initiated cortisol action regulates murf1 but not atrogin-1 in rainbow trout myotubes. Using RU486 to selectively block glucocorticoid receptor (GR), we found that early downregulation of murf1 is potentially mediated by membrane GR signaling in myotubes. Considering the results of both the in vivo and in vitro approaches, we suggest that membrane-initiated cortisol action regulates the early expression of atrophy-related processes in teleosts.
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Affiliation(s)
- Daniela Aravena-Canales
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, 8370146 Santiago, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), 4030000 Concepción, Chile
| | - Jorge E Aedo
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, 8370146 Santiago, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), 4030000 Concepción, Chile
| | - Alfredo Molina
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, 8370146 Santiago, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), 4030000 Concepción, Chile
| | - Juan Antonio Valdés
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, 8370146 Santiago, Chile; Interdisciplinary Center for Aquaculture Research (INCAR), 4030000 Concepción, Chile.
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8
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Das C, Faught E, Vijayan MM. Cortisol rapidly stimulates calcium waves in the developing trunk muscle of zebrafish. Mol Cell Endocrinol 2021; 520:111067. [PMID: 33129866 DOI: 10.1016/j.mce.2020.111067] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 10/09/2020] [Accepted: 10/21/2020] [Indexed: 02/07/2023]
Abstract
Glucocorticoids (GCs) play a role in stress coping by activating the glucocorticoid receptor (GR), a ligand-bound transcription factor. GCs also exert rapid effects that are nongenomic by modulating second messenger signaling, including Ca2+. However, the mechanism of action of GCs in modulating cytoplasmic free calcium level ([Ca2+]i) is unclear. We hypothesized that cortisol increases ([Ca2+]i) in zebrafish (Danio rerio) muscle, and this is independent of GR activation. Indeed, cortisol rapidly stimulated ([Ca2+]i) rise in the developing trunk muscle (DTM), and this response was not abolished in the GR knockout zebrafish. The rapid cortisol-induced ([Ca2+]i) rise was reduced with EGTA, and completely abolished by the pharmacological inhibition of the calcium release-activated calcium channel (CRACC). Also, cortisol stimulation rapidly increased the expression of Orai1, the pore forming protein subunit of CRACC, in the DTM. Altogether, rapid nongenomic action of cortisol on muscle function may involve Ca2+ signaling by CRACC gating in zebrafish.
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Affiliation(s)
- Chinmayee Das
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, T2N1N4, Canada
| | - Erin Faught
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, T2N1N4, Canada
| | - Mathilakath M Vijayan
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, T2N1N4, Canada.
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9
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Steiner JL, Johnson BR, Hickner RC, Ormsbee MJ, Williamson DL, Gordon BS. Adrenal stress hormone action in skeletal muscle during exercise training: An old dog with new tricks? Acta Physiol (Oxf) 2021; 231:e13522. [PMID: 32506657 DOI: 10.1111/apha.13522] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 05/29/2020] [Accepted: 05/29/2020] [Indexed: 12/12/2022]
Abstract
Exercise is a key component of a healthy lifestyle as it helps maintain a healthy body weight and reduces the risk of various morbidities and co-morbidities. Exercise is an acute physiological stress that initiates a multitude of processes that attempt to restore physiological homeostasis and promote adaptation. A component of the stress response to exercise is the rapid release of hormones from the adrenal gland including glucocorticoids, the catecholamines and aldosterone. While each hormone targets several tissues throughout the body, skeletal muscle is of interest as it is central to physical function and various metabolic processes. Indeed, adrenal stress hormones have been shown to elicit specific performance benefits on the muscle. However, how the acute, short-lived release of these stress hormones during exercise influences adaptations of skeletal muscle to long-term training remains largely unknown. Thus, the objective of this review was to briefly highlight the known impact of adrenal stress hormones on skeletal muscle metabolism and function (Old Dog), and critically examine the current evidence supporting a role for these endogenous hormones in mediating long-term training adaptations in skeletal muscle (New Tricks).
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Affiliation(s)
- Jennifer L. Steiner
- Department of Nutrition, Food and Exercise Sciences Florida State University Tallahassee FL USA
- Institute of Sports Sciences and Medicine Florida State University Tallahassee FL USA
| | - Bonde R. Johnson
- Department of Nutrition, Food and Exercise Sciences Florida State University Tallahassee FL USA
| | - Robert C. Hickner
- Department of Nutrition, Food and Exercise Sciences Florida State University Tallahassee FL USA
- Institute of Sports Sciences and Medicine Florida State University Tallahassee FL USA
- Department of Biokinetics, Exercise and Leisure Sciences University of KwaZulu‐Natal Durban South Africa
| | - Michael J. Ormsbee
- Department of Nutrition, Food and Exercise Sciences Florida State University Tallahassee FL USA
- Institute of Sports Sciences and Medicine Florida State University Tallahassee FL USA
- Department of Biokinetics, Exercise and Leisure Sciences University of KwaZulu‐Natal Durban South Africa
| | - David L. Williamson
- Kinesiology Program School of Behavioral Sciences and Education Pennsylvania State University at Harrisburg Middletown PA USA
| | - Bradley S. Gordon
- Department of Nutrition, Food and Exercise Sciences Florida State University Tallahassee FL USA
- Institute of Sports Sciences and Medicine Florida State University Tallahassee FL USA
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10
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Ahmed MH, Hassan A. Dexamethasone for the Treatment of Coronavirus Disease (COVID-19): a Review. ACTA ACUST UNITED AC 2020; 2:2637-2646. [PMID: 33163859 PMCID: PMC7599121 DOI: 10.1007/s42399-020-00610-8] [Citation(s) in RCA: 108] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2020] [Indexed: 12/15/2022]
Abstract
The World Health Organization (WHO) declared COVID-19 (novel coronavirus) as a global pandemic in the middle of March 2020, after the disease spread to more than 150 countries and territories leading to tens of thousands of cases within a couple of months. To date, there are no effective pharmaceutical treatments available. As well as that, the novel vaccines have not yet been approved as establishing their efficacy will take time. This study aims to summarize the evidence regarding corticosteroids such as dexamethasone for the treatment of COVID-19. Electronic searches were conducted on 7 September 2020 on Google Scholar database, MEDLINE and PubMed. A further search was conducted on the World Health Organization’s COVID-19 research article database. The findings of recent investigations that proved, both, the in vitro and in vivo activity of corticosteroids against COVID-19 and other coronavirus-related pneumonia were discussed. Low doses of corticosteroids (dexamethasone) could reduce the mortality in patients with severe COVID-19 disease; however, they had no effect on the mortality rate of those patients with a mild form of the condition. Moreover, the liberal use of corticosteroids was not advocated for, as high doses of the drug can cause more harm than good.
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Affiliation(s)
- Mukhtar H Ahmed
- SISAF Nanotechnology Drug Delivery, Ulster University, BT37 0QB Belfast, UK
| | - Arez Hassan
- School of Medicine, Queen's University, Belfast, BT9 7BL UK
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11
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Iwata T, Sadahira T, Ochiai K, Ueki H, Sasaki T, Haung P, Araki M, Watanabe T, Nasu Y, Watanabe M. Tumor suppressor REIC/Dkk-3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport. Exp Ther Med 2020; 20:1739-1745. [PMID: 32765682 DOI: 10.3892/etm.2020.8819] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Accepted: 12/31/2019] [Indexed: 12/18/2022] Open
Abstract
REIC/Dkk-3 is a tumor suppressor, and its expression is significantly downregulated in a variety of human cancer types. A previous study performed yeast two-hybrid screening and identified the small glutamine-rich tetratricopeptide repeat-containing protein α (SGTA), known as a negative modulator of cytoplasmic androgen receptor (AR) signaling, which is a novel interacting partner of REIC/Dkk-3. The previous study also indicated that the REIC/Dkk-3 protein interferes with the dimerization of SGTA and then upregulates the AR transport and signaling in human prostate cancer PC3 cells. Since the transport of some steroid receptors to nucleus is conducted similarly by dynein motor-dependent way, the current study aimed to investigate the role of SGTA and REIC/Dkk-3 in the transport of other glucocorticoid receptors (GR). In vitro reporter assays for the cytoplasmic GR transport were performed in human prostate cancer PC3 cells and 293T cells. As for the SGTA protein, a suppressive effect on the GR transport to the nucleus was observed in the cells. As for the REIC/Dkk-3 protein, an inhibitory effect was observed for the GR transport in PC3 cells. Under the depleted condition of SGTA by short-hairpin (sh)RNA, the downregulation of GR transport by REIC/Dkk-3 was significantly enhanced compared with the non-depleted condition in PC3 cells, suggesting a compensatory role of REIC/Dkk-3 in the SGTA mediated inhibition of GR transport. The current study therefore demonstrated that SGTA inhibited the cytoplasmic transport of GR in 293T and PC3 cells, and REIC/Dkk-3 also inhibited the cytoplasmic transport of GR in PC3 cells. These results may be used to gain novel insight into the GR transport and signaling in normal and cancer cells.
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Affiliation(s)
- Takehiro Iwata
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Takuya Sadahira
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Kazuhiko Ochiai
- School of Veterinary Nursing and Technology, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, Tokyo 180-8602
| | - Hideo Ueki
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Takanori Sasaki
- Collaborative Research Center for Okayama Medical Innovation Center (OMIC), Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Peng Haung
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Motoo Araki
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Toyohiko Watanabe
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Yasutomo Nasu
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan
| | - Masami Watanabe
- Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.,Center for Innovative Clinical Medicine, Okayama University Hospital, Okayama 700-8558, Japan
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12
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Kraemer WJ, Ratamess NA, Hymer WC, Nindl BC, Fragala MS. Growth Hormone(s), Testosterone, Insulin-Like Growth Factors, and Cortisol: Roles and Integration for Cellular Development and Growth With Exercise. Front Endocrinol (Lausanne) 2020; 11:33. [PMID: 32158429 PMCID: PMC7052063 DOI: 10.3389/fendo.2020.00033] [Citation(s) in RCA: 121] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 01/16/2020] [Indexed: 12/16/2022] Open
Abstract
Hormones are largely responsible for the integrated communication of several physiological systems responsible for modulating cellular growth and development. Although the specific hormonal influence must be considered within the context of the entire endocrine system and its relationship with other physiological systems, three key hormones are considered the "anabolic giants" in cellular growth and repair: testosterone, the growth hormone superfamily, and the insulin-like growth factor (IGF) superfamily. In addition to these anabolic hormones, glucocorticoids, mainly cortisol must also be considered because of their profound opposing influence on human skeletal muscle anabolism in many instances. This review presents emerging research on: (1) Testosterone signaling pathways, responses, and adaptations to resistance training; (2) Growth hormone: presents new complexity with exercise stress; (3) Current perspectives on IGF-I and physiological adaptations and complexity these hormones as related to training; and (4) Glucocorticoid roles in integrated communication for anabolic/catabolic signaling. Specifically, the review describes (1) Testosterone as the primary anabolic hormone, with an anabolic influence largely dictated primarily by genomic and possible non-genomic signaling, satellite cell activation, interaction with other anabolic signaling pathways, upregulation or downregulation of the androgen receptor, and potential roles in co-activators and transcriptional activity; (2) Differential influences of growth hormones depending on the "type" of the hormone being assayed and the magnitude of the physiological stress; (3) The exquisite regulation of IGF-1 by a family of binding proteins (IGFBPs 1-6), which can either stimulate or inhibit biological action depending on binding; and (4) Circadian patterning and newly discovered variants of glucocorticoid isoforms largely dictating glucocorticoid sensitivity and catabolic, muscle sparing, or pathological influence. The downstream integrated anabolic and catabolic mechanisms of these hormones not only affect the ability of skeletal muscle to generate force; they also have implications for pharmaceutical treatments, aging, and prevalent chronic conditions such as metabolic syndrome, insulin resistance, and hypertension. Thus, advances in our understanding of hormones that impact anabolic: catabolic processes have relevance for athletes and the general population, alike.
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Affiliation(s)
- William J. Kraemer
- Department of Human Sciences, The Ohio State University, Columbus, OH, United States
- *Correspondence: William J. Kraemer
| | - Nicholas A. Ratamess
- Department of Health and Exercise Science, The College of New Jersey, Ewing, NJ, United States
| | - Wesley C. Hymer
- Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, United States
| | - Bradley C. Nindl
- Department of Sports Medicine, School of Health and Rehabilitation Sciences, University of Pittsburgh, Pittsburgh, PA, United States
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13
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Aedo JE, Zuloaga R, Bastías-Molina M, Meneses C, Boltaña S, Molina A, Valdés JA. Early transcriptomic responses associated with the membrane-initiated action of cortisol in the skeletal muscle of rainbow trout (Oncorhynchus mykiss). Physiol Genomics 2019; 51:596-606. [DOI: 10.1152/physiolgenomics.00042.2019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Cortisol is a critical neuroendocrine regulator of the stress response in fish. Cortisol practically affects all tissues by interacting with an intracellular receptor and modulating target gene expression. However, cortisol also interacts with components of the plasma membrane in a nongenomic process that activates rapid signaling. Until now, the implication of this novel cortisol signaling for the global transcriptional response has not been explored. In the present work, we evaluated the effects of the membrane-initiated actions of cortisol on the in vivo transcriptome of rainbow trout ( Oncorhynchus mykiss) skeletal muscle. RNA-Seq analyses were performed to examine the transcriptomic changes in rainbow trout stimulated by physiological concentrations of cortisol and cortisol coupled with bovine serum albumin (cortisol-BSA), a membrane-impermeable analog of cortisol. A total of 660 million paired-ends reads were generated. Reads mapped onto the reference genome revealed that 1,737; 897; and 1,012 transcripts were differentially expressed after 1, 3, and 9 h of cortisol-BSA treatment, respectively. Gene Ontology analysis showed that this novel action of cortisol modulates several biological processes, such as mRNA processing, ubiquitin-dependent protein catabolic processes, and transcription regulation. In addition, a KEGG analysis revealed that focal adhesion was the main signaling pathway that was upregulated at all the times tested. Taking these results together, we propose that the membrane-initiated cortisol action contributes significantly in the regulation of stress-mediated gene expression.
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Affiliation(s)
- Jorge E. Aedo
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago, Chile
- Interdisciplinary Center for Aquaculture Research (INCAR), Concepción, Chile
| | - Rodrigo Zuloaga
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago, Chile
| | - Macarena Bastías-Molina
- Universidad Andrés Bello, Centro de Biotecnología Vegetal, FONDAP Center for Genome Regulation, Facultad de Ciencias de la Vida, Santiago, Chile
| | - Claudio Meneses
- Universidad Andrés Bello, Centro de Biotecnología Vegetal, FONDAP Center for Genome Regulation, Facultad de Ciencias de la Vida, Santiago, Chile
| | - Sebastián Boltaña
- Interdisciplinary Center for Aquaculture Research (INCAR), Concepción, Chile
- Universidad de Concepción, ThermoFish Lab, Biotechnology Center, Concepción, Chile
| | - Alfredo Molina
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago, Chile
- Universidad de Concepción, ThermoFish Lab, Biotechnology Center, Concepción, Chile
| | - Juan Antonio Valdés
- Universidad Andrés Bello, Departamento Ciencias Biológicas, Facultad de Ciencias de la Vida, Santiago, Chile
- Universidad de Concepción, ThermoFish Lab, Biotechnology Center, Concepción, Chile
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14
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Gong H, Liu L, Su WJ, Zhu Z, Liu YZ, Lian YJ, Peng W, Cao ZY, Zhang T, Jiang CL. Corticosterone rapidly improves the endurance of high-intensity exercise (swimming) via nongenomic mechanisms in mice. J Sports Med Phys Fitness 2018; 59:886-891. [PMID: 29845836 DOI: 10.23736/s0022-4707.18.08456-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BACKGROUND Glucocorticoids (GCs) take a pivotal role during the stress response. Some clinical studies suggest short-term GCs intake improves exercise endurance. However, whether the rapid nongenomic effects of GCs are involved in acute exercise is still unknown. Here, we aimed to reveal the potential nongenomic effects of GCs in skeletal muscle of mice during exercise. METHODS Adrenalectomized mice subjected to a weight-loaded forced swim were used for detecting the changes of time to exhaustion. Corticosterone (CORT) and other drugs were injected via the coccygeal vein before swimming. After exhaustion, the injury of skeletal muscle, nitric oxide generation, blood glucose and lactic acid were determined. RESULTS The results demonstrated that CORT rapidly extended the time to exhaustion within 30 min (~30%), which could not be abolished by glucocorticoid receptor antagonist RU486. Pretreatment with the nitric oxide synthesis inhibitor L-NAME prior to CORT administration further increased exercise tolerance compared to the increase caused by CORT alone. Moreover, CORT contributed to protecting skeletal muscle from injury and maintaining blood glucose. CONCLUSIONS Considered together, our results suggest that GCs rapidly improve exercise tolerance via its nongenomic mechanism, which is associated with the inhibition of nitric oxide generation. Pretreatment of GCs may be helpful to enhance exercise tolerance during acute exercise.
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Affiliation(s)
- Hong Gong
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Lei Liu
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Wen-Jun Su
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Zhen Zhu
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Yun-Zi Liu
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Yong-Jie Lian
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Wei Peng
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Zhi-Yong Cao
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China
| | - Ting Zhang
- Department of Navy Medicine, Second Military Medical University, Shanghai, China
| | - Chun-Lei Jiang
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai, China -
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15
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Hermidorff MM, de Assis LVM, Isoldi MC. Genomic and rapid effects of aldosterone: what we know and do not know thus far. Heart Fail Rev 2018; 22:65-89. [PMID: 27942913 DOI: 10.1007/s10741-016-9591-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Aldosterone is the most known mineralocorticoid hormone synthesized by the adrenal cortex. The genomic pathway displayed by aldosterone is attributed to the mineralocorticoid receptor (MR) signaling. Even though the rapid effects displayed by aldosterone are long known, our knowledge regarding the receptor responsible for such event is still poor. It is intense that the debate whether the MR or another receptor-the "unknown receptor"-is the receptor responsible for the rapid effects of aldosterone. Recently, G protein-coupled estrogen receptor-1 (GPER-1) was elegantly shown to mediate some aldosterone-induced rapid effects in several tissues, a fact that strongly places GPER-1 as the unknown receptor. It has also been suggested that angiotensin receptor type 1 (AT1) also participates in the aldosterone-induced rapid effects. Despite this open question, the relevance of the beneficial effects of aldosterone is clear in the kidneys, colon, and CNS as aldosterone controls the important water reabsorption process; on the other hand, detrimental effects displayed by aldosterone have been reported in the cardiovascular system and in the kidneys. In this line, the MR antagonists are well-known drugs that display beneficial effects in patients with heart failure and hypertension; it has been proposed that MR antagonists could also play an important role in vascular disease, obesity, obesity-related hypertension, and metabolic syndrome. Taken altogether, our goal here was to (1) bring a historical perspective of both genomic and rapid effects of aldosterone in several tissues, and the receptors and signaling pathways involved in such processes; and (2) critically address the controversial points within the literature as regarding which receptor participates in the rapid pathway display by aldosterone.
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Affiliation(s)
- Milla Marques Hermidorff
- Laboratory of Hypertension, Research Center in Biological Science, Institute of Exact and Biological Sciences, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, 35400-000, Brazil
| | - Leonardo Vinícius Monteiro de Assis
- Laboratory of Comparative Physiology of Pigmentation, Department of Physiology, Institute of Biosciences, University of São Paulo, São Paulo, Brazil
| | - Mauro César Isoldi
- Laboratory of Hypertension, Research Center in Biological Science, Institute of Exact and Biological Sciences, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, 35400-000, Brazil.
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16
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Membrane-Associated Effects of Glucocorticoid on BACE1 Upregulation and Aβ Generation: Involvement of Lipid Raft-Mediated CREB Activation. J Neurosci 2017; 37:8459-8476. [PMID: 28855330 DOI: 10.1523/jneurosci.0074-17.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 07/24/2017] [Accepted: 07/27/2017] [Indexed: 11/21/2022] Open
Abstract
Glucocorticoid has been widely accepted to induce Alzheimer's disease, but the nongenomic effect of glucocorticoid on amyloid β (Aβ) generation has yet to be studied. Here, we investigated the effect of the nongenomic pathway induced by glucocorticoid on amyloid precursor protein processing enzymes as well as Aβ production using male ICR mice and human neuroblastoma SK-N-MC cells. Mice groups exposed to restraint stress or intracerebroventricular injection of Aβ showed impaired cognition, decreased intracellular glucocorticoid receptor (GR) level, but elevated level of membrane GR (mGR). In this respect, we identified the mGR-dependent pathway evoked by glucocorticoid using impermeable cortisol conjugated to BSA (cortisol-BSA) on SK-N-MC cells. Cortisol-BSA augmented the expression of β-site amyloid precursor protein cleaving enzyme 1 (BACE1), the level of C-terminal fragment β of amyloid precursor protein (C99) and Aβ production, which were maintained even after blocking intracellular GR. We also found that cortisol-BSA enhanced the interaction between mGR and Gαs, which colocalized in the lipid raft. The subsequently activated CREB by cortisol-BSA bound to the CRE site of the BACE1 promoter increasing its expression, which was downregulated by inhibiting CBP. Consistently, blocking CBP attenuated cognitive impairment and Aβ production induced by corticosterone treatment or intracerebroventricular injection of Aβ more efficiently than inhibiting intracellular GR in mice. In conclusion, glucocorticoid couples mGR with Gαs and triggers cAMP-PKA-CREB axis dependent on the lipid raft to stimulate BACE1 upregulation and Aβ generation.SIGNIFICANCE STATEMENT Patients with Alzheimer's disease (AD) have been growing sharply and stress is considered as the major environment factor of AD. Glucocorticoid is the primarily responsive factor to stress and is widely known to induce AD. However, most AD patients usually have impaired genomic pathway of glucocorticoid due to intracellular glucocorticoid receptor deficiency. In this respect, the genomic mechanism of glucocorticoid faces difficulties in explaining the consistent amyloid β (Aβ) production. Therefore, it is necessary to investigate the novel pathway of glucocorticoid on Aβ generation to find a more selective therapeutic approach to AD patients. In this study, we revealed the importance of nongenomic pathway induced by glucocorticoid where membrane glucocorticoid receptor plays an important role in Aβ formation.
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17
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Bekhbat M, Rowson SA, Neigh GN. Checks and balances: The glucocorticoid receptor and NFĸB in good times and bad. Front Neuroendocrinol 2017; 46:15-31. [PMID: 28502781 PMCID: PMC5523465 DOI: 10.1016/j.yfrne.2017.05.001] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/21/2017] [Accepted: 05/09/2017] [Indexed: 01/23/2023]
Abstract
Mutual regulation and balance between the endocrine and immune systems facilitate an organism's stress response and are impaired following chronic stress or prolonged immune activation. Concurrent alterations in stress physiology and immunity are increasingly recognized as contributing factors to several stress-linked neuropsychiatric disorders including depression, anxiety, and post-traumatic stress disorder. Accumulating evidence suggests that impaired balance and crosstalk between the glucocorticoid receptor (GR) and nuclear factor kappa-light-chain-enhancer of activated B cells (NFκB) - effectors of the stress and immune axes, respectively - may play a key role in mediating the harmful effects of chronic stress on mood and behavior. Here, we first review the molecular mechanisms of GR and NFκB interactions in health, then describe potential shifts in the GR-NFκB dynamics in chronic stress conditions within the context of brain circuitry relevant to neuropsychiatric diseases. Furthermore, we discuss developmental influences and sex differences in the regulation of these two transcription factors.
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Affiliation(s)
- Mandakh Bekhbat
- Emory University, Graduate Division of Biological Sciences, Neuroscience Graduate Program, United States
| | - Sydney A Rowson
- Emory University, Graduate Division of Biological Sciences, Molecular and Systems Pharmacology Graduate Studies Program, United States
| | - Gretchen N Neigh
- Virginia Commonwealth University, Department of Anatomy & Neurobiology, United States.
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18
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Wendowski O, Redshaw Z, Mutungi G. Dihydrotestosterone treatment rescues the decline in protein synthesis as a result of sarcopenia in isolated mouse skeletal muscle fibres. J Cachexia Sarcopenia Muscle 2017; 8:48-56. [PMID: 27239418 PMCID: PMC4863930 DOI: 10.1002/jcsm.12122] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 01/05/2016] [Accepted: 04/05/2016] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Sarcopenia, the progressive decline in skeletal muscle mass and function with age, is a debilitating condition. It leads to inactivity, falls, and loss of independence. Despite this, its cause(s) and the underlying mechanism(s) are still poorly understood. METHODS In this study, small skeletal muscle fibre bundles isolated from the extensor digitorum longus (a fast-twitch muscle) and the soleus (a slow-twitch muscle) of adult mice of different ages (range 100-900 days old) were used to investigate the effects of ageing and dihydrotestosterone (DHT) treatment on protein synthesis as well as the expression and function of two amino acid transporters; the sodium-coupled neutral amino acid transporter (SNAT) 2, and the sodium-independent L-type amino-acid transporter (LAT) 2. RESULTS At all ages investigated, protein synthesis was always higher in the slow-twitch than in the fast-twitch muscle fibres and decreased with age in both fibre types. However, the decline was greater in the fast-twitch than in the slow-twitch fibres and was accompanied by a reduction in the expression of SNAT2 and LAT2 at the protein level. Again, the decrease in the expression of the amino acid transporters was greater in the fast-twitch than in the slow-twitch fibres. In contrast, ageing had no effect on SNAT2 and LAT2 expressions at the mRNA level. Treating the muscle fibre bundles with physiological concentrations (~2 nM) of DHT for 1 h completely reversed the effects of ageing on protein synthesis and the expression of SNAT2 and LAT2 protein in both fibre types. CONCLUSION From the observations that ageing is accompanied by a reduction in protein synthesis and transporter expression and that these effects are reversed by DHT treatment, we conclude that sarcopenia arises from an age-dependent reduction in protein synthesis caused, in part, by the lack of or by the low bioavailability of the male sex steroid, DHT.
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Affiliation(s)
- Oskar Wendowski
- Department of Medicine, Norwich Medical School University of East Anglia Norwich NR4 7TJ UK
| | - Zoe Redshaw
- Faculty of Health and Life Sciences De Montfort University Leicester UK
| | - Gabriel Mutungi
- Department of Medicine, Norwich Medical School University of East Anglia Norwich NR4 7TJ UK
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19
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Espinoza MB, Aedo JE, Zuloaga R, Valenzuela C, Molina A, Valdés JA. Cortisol Induces Reactive Oxygen Species Through a Membrane Glucocorticoid Receptor in Rainbow Trout Myotubes. J Cell Biochem 2016; 118:718-725. [PMID: 27564718 DOI: 10.1002/jcb.25676] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 08/25/2016] [Indexed: 12/31/2022]
Abstract
Cortisol is an essential regulator of neuroendocrine stress responses in teleosts. Cortisol predominantly affects target tissues through the genomic pathway, which involves interacting with cytoplasmic glucocorticoid receptors, and thereby, modulating stress-response gene expressions. Cortisol also produces rapid effects via non-genomic pathways, which do not involve gene transcription. Although cortisol-mediated genomic pathways are well documented in teleosts, non-genomic pathways are not fully understood. Moreover, no studies have focused on the contribution of non-genomic cortisol pathways in compensatory stress responses in fish. In this study, rainbow trout (Oncorhynchus mykiss) skeletal myotubes were stimulated with physiological concentrations of cortisol and cortisol-BSA, a membrane-impermeable agent, resulting in an early induction of reactive oxygen species (ROS). This production was not suppressed by transcription or translation inhibitors, suggesting non-genomic pathway involvement. Moreover, myotube preincubation with RU486 and NAC completely suppressed cortisol- and cortisol-BSA-induced ROS production. Subcellular fractionation analysis revealed the presence of cell membrane glucocorticoid receptors. Finally, cortisol-BSA induced a significant increase in ERK1/2 and CREB phosphorylation, as well as in CREB-dependent transcriptional activation of the pgc1a gene expression. The obtained results strongly suggest that cortisol acts through a non-genomic glucocorticoid receptor-mediated pathway to induce ROS production and contribute to ERK/CREB/PGC1-α signaling pathway activation as stress compensation mechanisms. J. Cell. Biochem. 118: 718-725, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Marlen B Espinoza
- Laboratorio de Biotecnología Molecular, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Santiago, Chile.,Interdisciplinary Center for Aquaculture Research (INCAR), P.O. Box 160-C, Concepción, Chile
| | - Jorge E Aedo
- Laboratorio de Biotecnología Molecular, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Santiago, Chile.,Interdisciplinary Center for Aquaculture Research (INCAR), P.O. Box 160-C, Concepción, Chile
| | - Rodrigo Zuloaga
- Laboratorio de Biotecnología Molecular, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Santiago, Chile.,Interdisciplinary Center for Aquaculture Research (INCAR), P.O. Box 160-C, Concepción, Chile
| | - Cristian Valenzuela
- Laboratorio de Biotecnología Molecular, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Santiago, Chile.,Interdisciplinary Center for Aquaculture Research (INCAR), P.O. Box 160-C, Concepción, Chile
| | - Alfredo Molina
- Laboratorio de Biotecnología Molecular, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Santiago, Chile.,Interdisciplinary Center for Aquaculture Research (INCAR), P.O. Box 160-C, Concepción, Chile.,Centro de Investigación Marina Quintay (CIMARQ), Universidad Andrés Bello, Quintay, Chile
| | - Juan A Valdés
- Laboratorio de Biotecnología Molecular, Facultad de Ciencias Biológicas, Universidad Andrés Bello, Santiago, Chile.,Interdisciplinary Center for Aquaculture Research (INCAR), P.O. Box 160-C, Concepción, Chile.,Centro de Investigación Marina Quintay (CIMARQ), Universidad Andrés Bello, Quintay, Chile
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20
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Gong H, Liu L, Ni CX, Zhang Y, Su WJ, Lian YJ, Peng W, Zhang JP, Jiang CL. Dexamethasone rapidly inhibits glucose uptake via non-genomic mechanisms in contracting myotubes. Arch Biochem Biophys 2016; 603:102-9. [PMID: 27246478 DOI: 10.1016/j.abb.2016.05.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/25/2016] [Accepted: 05/26/2016] [Indexed: 12/31/2022]
Abstract
Glucocorticoids (GCs) are a class of steroid hormones that regulate multiple aspects of glucose homeostasis. In skeletal muscle, it is well established that prolonged GC excess inhibits glucose uptake and utilization through glucocorticoid receptor (GR)-mediated transcriptional changes. However, it remains obscure that whether the rapid non-genomic effects of GC on glucose uptake are involved in acute exercise stress. Therefore, we used electric pulse stimulation (EPS)-evoked contracting myotubes to determine whether the non-genomic actions of GC were involved and its underlying mechanism(s). Pretreatment with dexamethasone (Dex, 10 μM) significantly prevented contraction-stimulated glucose uptake and glucose transporter 4 (Glut4) translocation within 20 min in C2C12 myotubes. Neither GC nuclear receptor antagonist (RU486) nor protein synthesis inhibitor (cycloheximide, Chx) affected the rapid inhibition effects of Dex. AMPK and CaMKII-dependent signaling pathways were associated with the non-genomic effects of Dex. These results provide evidence that GC rapidly suppresses glucose uptake in contracting myotubes via GR-independent non-genomic mechanisms. AMPK and CaMKII-mediated Glut4 translocation may play a critical role in GC-induced rapid inhibition of glucose uptake.
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Affiliation(s)
- Hong Gong
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Lei Liu
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Chen-Xu Ni
- Department of Pharmacy, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, People's Republics of China
| | - Yi Zhang
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Wen-Jun Su
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Yong-Jie Lian
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Wei Peng
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Jun-Ping Zhang
- Department of Pharmacy, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Chun-Lei Jiang
- Laboratory of Stress Medicine, Faculty of Psychology and Mental Health, Second Military Medical University, Shanghai 200433, People's Republic of China.
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21
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Bodine SC, Furlow JD. Glucocorticoids and Skeletal Muscle. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015. [PMID: 26215994 DOI: 10.1007/978-1-4939-2895-8_7] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Glucocorticoids are known to regulate protein metabolism in skeletal muscle, producing a catabolic effect that is opposite that of insulin. In many catabolic diseases, such as sepsis, starvation, and cancer cachexia, endogenous glucocorticoids are elevated contributing to the loss of muscle mass and function. Further, exogenous glucocorticoids are often given acutely and chronically to treat inflammatory conditions such as asthma, chronic obstructive pulmonary disease, and rheumatoid arthritis, resulting in muscle atrophy. This chapter will detail the nature of glucocorticoid-induced muscle atrophy and discuss the mechanisms thought to be responsible for the catabolic effects of glucocorticoids on muscle.
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Affiliation(s)
- Sue C Bodine
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA,
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Boncompagni S, Arthurton L, Akujuru E, Pearson T, Steverding D, Protasi F, Mutungi G. Membrane glucocorticoid receptors are localised in the extracellular matrix and signal through the MAPK pathway in mammalian skeletal muscle fibres. J Physiol 2015; 593:2679-92. [PMID: 25846902 DOI: 10.1113/jp270502] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 03/30/2015] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Many studies have previously suggested the existence of stress hormone receptors on the cell membrane of many cell types, including skeletal muscle fibres; however, the exact localisation of these receptors and how they signal to the rest of the cell is poorly understood. In this study, we investigated the localisation and the mechanism(s) underlying the physiological functions of these receptors in mouse skeletal muscle cells. We found that the receptors were present throughout muscle development and that, in adult muscle fibres, they were localised in the extracellular matrix, satellite cells (muscle stem cells) and close to mitochondria. We also found that they signalled to the rest of the cell by activating enzymes called mitogen-activated protein kinases. From these results we suggest that, at physiological concentrations, stress hormones may be important in skeletal muscle differentiation, repair and regeneration. ABSTRACT A number of studies have previously proposed the existence of glucocorticoid receptors on the plasma membrane of many cell types, including skeletal muscle fibres. However, their exact localisation and the cellular signalling pathway(s) they utilise to communicate with the rest of the cell are still poorly understood. In this study, we investigated the localisation and the mechanism(s) underlying the non-genomic physiological functions of these receptors in mouse skeletal muscle cells. The results show that the receptors were localised in the cytoplasm in myoblasts, in the nucleus in myotubes, in the extracellular matrix, in satellite cells and in the proximity of mitochondria in adult muscle fibres. Also, they bound laminin in a glucocorticoid-dependent manner. Treating small skeletal muscle fibre bundles with the synthetic glucocorticoid beclomethasone dipropionate increased the phosphorylation (= activation) of extracellular signal-regulated kinases 1 and 2, c-Jun N-terminal kinase and p38 mitogen-activated protein kinase. This occurred within 5 min and depended on the fibre type and the duration of the treatment. It was also abolished by the glucocorticoid receptor inhibitor, mifepristone, and a monoclonal antibody against the receptor. From these results we conclude that the non-genomic/non-canonical physiological functions of glucocorticoids, in adult skeletal muscle fibres, are mediated by a glucocorticoid receptor localised in the extracellular matrix, in satellite cells and close to mitochondria, and involve activation of the mitogen-activated protein kinase pathway.
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Affiliation(s)
- Simona Boncompagni
- Centre for Research on Aging, University G. d'Annunzio, I-66013, Chieti, Italy
| | - Lewis Arthurton
- School of Life Sciences, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Eugene Akujuru
- Department of Medicine, Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Timothy Pearson
- Department of Medicine, Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Dietmar Steverding
- Department of Medicine, Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Feliciano Protasi
- Department of Neuroscience, Imaging and Clinical Sciences, University G. d'Annunzio, I-66013, Chieti, Italy
| | - Gabriel Mutungi
- Department of Medicine, Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ, UK
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Boardman C, Chachi L, Gavrila A, Keenan CR, Perry MM, Xia YC, Meurs H, Sharma P. Mechanisms of glucocorticoid action and insensitivity in airways disease. Pulm Pharmacol Ther 2014; 29:129-43. [PMID: 25218650 DOI: 10.1016/j.pupt.2014.08.008] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 08/18/2014] [Accepted: 08/25/2014] [Indexed: 01/04/2023]
Abstract
Glucocorticoids are the mainstay for the treatment of chronic inflammatory diseases including asthma and chronic obstructive pulmonary disease (COPD). However, it has been recognized that glucocorticoids do not work well in certain patient populations suggesting reduced sensitivity. The ultimate biologic responses to glucocorticoids are determined by not only the concentration of glucocorticoids but also the differences between individuals in glucocorticoid sensitivity, which is influenced by multiple factors. Studies are emerging to understand these mechanisms in detail, which would help in increasing glucocorticoid sensitivity in patients with chronic airways disease. This review aims to highlight both classical and emerging concepts of the anti-inflammatory mechanisms of glucocorticoids and also review some novel strategies to overcome steroid insensitivity in airways disease.
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Affiliation(s)
- C Boardman
- Airway Disease, National Heart and Lung Institute, Imperial College, London, United Kingdom
| | - L Chachi
- Institute for Lung Health, Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
| | - A Gavrila
- Institute for Lung Health, Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
| | - C R Keenan
- Department of Pharmacology, University of Melbourne, Parkville, Victoria, Australia
| | - M M Perry
- Airway Disease, National Heart and Lung Institute, Imperial College, London, United Kingdom
| | - Y C Xia
- Department of Pharmacology, University of Melbourne, Parkville, Victoria, Australia
| | - H Meurs
- Department of Molecular Pharmacology, University of Groningen, Groningen, The Netherlands
| | - P Sharma
- Department of Physiology and Pharmacology, Airways Inflammation Research Group, Snyder Institute for Chronic Diseases, University of Calgary, 4C46 HRIC, 3280 Hospital Dr NW, Calgary, AB, Canada T2N 4N1.
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Troncoso R, Paredes F, Parra V, Gatica D, Vásquez-Trincado C, Quiroga C, Bravo-Sagua R, López-Crisosto C, Rodriguez AE, Oyarzún AP, Kroemer G, Lavandero S. Dexamethasone-induced autophagy mediates muscle atrophy through mitochondrial clearance. Cell Cycle 2014; 13:2281-95. [PMID: 24897381 DOI: 10.4161/cc.29272] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Glucocorticoids, such as dexamethasone, enhance protein breakdown via ubiquitin-proteasome system. However, the role of autophagy in organelle and protein turnover in the glucocorticoid-dependent atrophy program remains unknown. Here, we show that dexamethasone stimulates an early activation of autophagy in L6 myotubes depending on protein kinase, AMPK, and glucocorticoid receptor activity. Dexamethasone increases expression of several autophagy genes, including ATG5, LC3, BECN1, and SQSTM1 and triggers AMPK-dependent mitochondrial fragmentation associated with increased DNM1L protein levels. This process is required for mitophagy induced by dexamethasone. Inhibition of mitochondrial fragmentation by Mdivi-1 results in disrupted dexamethasone-induced autophagy/mitophagy. Furthermore, Mdivi-1 increases the expression of genes associated with the atrophy program, suggesting that mitophagy may serve as part of the quality control process in dexamethasone-treated L6 myotubes. Collectively, these data suggest a novel role for dexamethasone-induced autophagy/mitophagy in the regulation of the muscle atrophy program.
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Affiliation(s)
- Rodrigo Troncoso
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Felipe Paredes
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Valentina Parra
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile; Department of Internal Medicine (Cardiology Division); University of Texas Southwestern Medical Center; Dallas, TX USA
| | - Damián Gatica
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - César Vásquez-Trincado
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Clara Quiroga
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Roberto Bravo-Sagua
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Camila López-Crisosto
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Andrea E Rodriguez
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Alejandra P Oyarzún
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile
| | - Guido Kroemer
- Equipe 11 labellisée pas la Ligue Nationale contre le Cancer; INSERM; Centre de Recherche des Cordeliers; Paris, France; Metabolomics and Cell Biology Platforms; Institut Gustave Roussy; Villejuif, France; Pôle de Biologie; Hôpital Européen Georges Pompidou; AP-HP; Paris, France; Université Paris Descartes; Paris Sorbonne Cité; Paris, France
| | - Sergio Lavandero
- Advanced Center for Chronic Disease (ACCDiS); University of Chile; Santiago, Chile; Center for Molecular Studies of the Cell; Faculty of Chemical & Pharmaceutical Sciences & Faculty of Medicine; University of Chile; Santiago, Chile; Department of Internal Medicine (Cardiology Division); University of Texas Southwestern Medical Center; Dallas, TX USA
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De Loof A, De Haes W, Janssen T, Schoofs L. The essence of insect metamorphosis and aging: electrical rewiring of cells driven by the principles of juvenile hormone-dependent Ca(2+)-homeostasis. Gen Comp Endocrinol 2014; 199:70-85. [PMID: 24480635 DOI: 10.1016/j.ygcen.2014.01.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 01/16/2014] [Accepted: 01/19/2014] [Indexed: 01/22/2023]
Abstract
In holometabolous insects the fall to zero of the titer of Juvenile Hormone ends its still poorly understood "status quo" mode of action in larvae. Concurrently it initiates metamorphosis of which the programmed cell death of all internal tissues that actively secrete proteins, such as the fat body, midgut, salivary glands, prothoracic glands, etc. is the most drastic aspect. These tissues have a very well developed rough endoplasmic reticulum, a known storage site of intracellular Ca(2+). A persistent high [Ca(2+)]i is toxic, lethal and causal to apoptosis. Metamorphosis becomes a logical phenomenon if analyzed from: (1) the causal link between calcium toxicity and apoptosis; (2) the largely overlooked fact that at least some isoforms of Ca(2+)-ATPases have a binding site for farnesol-like endogenous sesquiterpenoids (FRS). The Ca(2+)-ATPase blocker thapsigargin, like JH a sesquiterpenoid derivative, illustrates how absence of JH might work. The Ca(2+)-homeostasis system is concurrently extremely well conserved in evolution and highly variable, enabling tissue-, developmental-, and species specificity. As long as JH succeeds in keeping [Ca(2+)]i low by keeping the Ca(2+)-ATPases pumping, it acts as "the status quo" hormone. When it disappears, its various inhibitory effects are lifted. The electrical wiring system of cells, in particular in the regenerating tissues, is subject to change during metamorphosis. The possibility is discussed that in vertebrates an endogenous farnesol-like sesquiterpenoid, probably farnesol itself, acts as a functional, but hitherto completely overlooked Juvenile anti-aging "Inbrome", a novel concept in signaling.
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Affiliation(s)
- Arnold De Loof
- Functional Genomics and Proteomics Group, Department of Biology, KU Leuven - University of Leuven, Belgium.
| | - Wouter De Haes
- Functional Genomics and Proteomics Group, Department of Biology, KU Leuven - University of Leuven, Belgium
| | - Tom Janssen
- Functional Genomics and Proteomics Group, Department of Biology, KU Leuven - University of Leuven, Belgium
| | - Liliane Schoofs
- Functional Genomics and Proteomics Group, Department of Biology, KU Leuven - University of Leuven, Belgium
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