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Zhang X, Wang D, Liu J. Hypoxia-inducible factor-1α is involved in the response to heat stress in lactating dairy cows. J Therm Biol 2023; 112:103460. [PMID: 36796905 DOI: 10.1016/j.jtherbio.2023.103460] [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: 07/25/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 01/09/2023]
Abstract
Hypoxia-inducible factor-1α (HIF-1α) is important in maintaining cellular oxygen homeostasis and cellular heat tolerance. To explore the role of HIF-1α in the response to heat stress (HS) in dairy cows, 16 Chinese Holstein cows (milk yield: 32 ± 4 kg/d, days in milk: 272 ± 7 d, parity: 2-3) were used to collect coccygeal vein blood and milk samples when cows were under mild (temperature-humidity index = 77) and moderate HS (temperature-humidity index = 84), respectively. Compared to cows under mild HS, the respiratory rate (P < 0.01), rectal temperature (P < 0.01), and blood concentrations of heat shock protein (HSP)70 (P < 0.01) and HSP27 (P < 0.01) were higher, but oxygen saturation (P = 0.02) and hemoglobin (P < 0.01) were lower in cows under moderate HS. Blood HIF-1α concentration was greater (P < 0.01) during moderate HS, indicating that HIF-1α is involved in lactating cows' response to HS. To confirm these findings, we collected coccygeal vein blood and milk samples from 59 dairy cows under moderate HS. The HIF-1α levels were correlated with the levels of heat shock transcription factor (HSF) (r = 0.7857, P < 0.01), HSP70 (r = 0.4543, P < 0.01) and HSP27 (r = 0.8782, P < 0.01). A comparison of 15 cows with higher HIF-1α (>482 ng/L) and 15 cows with lower HIF-1α levels (<439 ng/L) showed that reactive oxidative species were higher (P = 0.02), but superoxide dismutase (P < 0.01), total antioxidation capacity (P = 0.02) and glutathione peroxidase (P < 0.01) were lower in higher HIF-1α cows. These results suggested that HIF-1α may be indicative of the risk of oxidative stress in heat-stressed cows and may participate in the response of cows to HS by synergistically activating the expression of the HSP family with HSF.
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Affiliation(s)
- Xu Zhang
- Institute of Dairy Science, College of Animal Sciences, China; Ministry of Education Key Laboratory of Molecular Animal Nutrition, Zhejiang University, 310058, Hangzhou, China
| | - Diming Wang
- Institute of Dairy Science, College of Animal Sciences, China; Ministry of Education Key Laboratory of Molecular Animal Nutrition, Zhejiang University, 310058, Hangzhou, China
| | - Jianxin Liu
- Institute of Dairy Science, College of Animal Sciences, China; Ministry of Education Key Laboratory of Molecular Animal Nutrition, Zhejiang University, 310058, Hangzhou, China.
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2
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Siquier-Coll J, Bartolomé I, Pérez-Quintero M, Toro-Román V, Grijota FJ, Maynar-Mariño M. Heart Rate and Body Temperature Evolution in an Interval Program of Passive Heat Acclimation at High Temperatures (100 ± 2 °C) in a Sauna. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:2082. [PMID: 36767447 PMCID: PMC9916041 DOI: 10.3390/ijerph20032082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Heat exposure provokes stress on the human body. If it remains constant, it leads to adaptations such as heat acclimation. This study aims to observe the evolution of heart rate (HR), core temperature (Tcore), and skin temperature (Tskin) in an intervallic program of exposure to extreme heat. Twenty-nine healthy male volunteers were divided into a control group (CG; n = 14) and an experimental group (EG; n = 15). EG experienced nine sessions (S) of intervallic exposure to high temperatures (100 ± 2 °C), whereas CG was exposed to ambient temperatures (22 ± 2 °C). HR, Tskin, and Tcore were monitored in S1, 4, 5, 8, and 9. An important increase in HR occurred in the S4 compared to the rest (p < 0.05) in EG. A lower HR was discovered in S8 and S9 compared to S4 and in S9 in relation to S1 (p < 0.05) in EG. EG experiences a gradual decrease in Tcore and Tskin, which was detected throughout the assessments, although it was only significant in the S8 and S9 (p < 0.05). Interval exposure to heat at 100 ± 2 °C elicits stress on the human organism, fundamentally increasing Tcore, Tskin, and FC. This recurring stress in the full program caused a drop in the thermoregulatory response as an adaptation or acclimation to heat.
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Affiliation(s)
- Jesús Siquier-Coll
- SER Research Group, Center of Higher Education Alberta Giménez, Comillas Pontifical University, Costa de Saragossa 16, 07013 Palma Mallorca, Spain
| | - Ignacio Bartolomé
- Department of Sport Science, Faculty of Education, Pontifical University of Salamanca, C/Henry Collet, 52-70, 37007 Salamanca, Spain
| | - Mario Pérez-Quintero
- Faculty of Sport Sciences, University of Extremadura, Avenida de la Universidad s/n, 10003 Caceres, Spain
| | - Víctor Toro-Román
- Faculty of Sport Sciences, University of Extremadura, Avenida de la Universidad s/n, 10003 Caceres, Spain
| | - Francisco J. Grijota
- Faculty of Sport Sciences, University of Extremadura, Avenida de la Universidad s/n, 10003 Caceres, Spain
| | - Marcos Maynar-Mariño
- Faculty of Sport Sciences, University of Extremadura, Avenida de la Universidad s/n, 10003 Caceres, Spain
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3
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Horowitz M, Hasin Y. Vascular compliance and left ventricular compliance cross talk: Implications for using long-term heat acclimation in cardiac care. Front Physiol 2023; 14:1074391. [PMID: 36960151 PMCID: PMC10027724 DOI: 10.3389/fphys.2023.1074391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 02/23/2023] [Indexed: 03/09/2023] Open
Abstract
1) The first evidence of the beneficial impact of Long-Term-Heat-Acclimation (LTHA) on cardio-vascular compliance was the positive inotropic response and improved left ventricular (LV) compliance noted when isolated hearts from LTHA rats were studied. Human echo study demonstrates that passive HA affects the right ventricle and the atria as well. 2) There is a cross-talk between vascular and cardiac compliance. Vascular compliance per se is defined by central venous pressure-Blood volume relationship-Global Vascular Compliance (GVC). It is determined by the sum of the vascular compliance of the vessels in every organ in any physiological state, varies with LTHA and thus influences cardiac performance. LTHA improves endothelial function, increases NO (nitric oxide) production, in-turn stimulating alterations in ECM (extracellular matrix) via the TGF β1-SMAD pathway. 3) LTHA is associated with transformation from fast to slow myosin, heat acclimation ischemic/hypoxic cross-tolerance and alterations in the extracellular matrix. 4) A human translational study demonstrated improved LV compliance following bypass surgery in LTHA subjects compared to controls. 5) Diastolic dysfunction and the impact of comorbidities with vascular and non- vascular origins are major contributors to the syndrome of heart failure with preserved ejection function (HFPEF). Unfortunately, there is a paucity of treatment modalities that improve diastolic dysfunction. 6) In the current mini-review we suggest that LTHA may be beneficial to HFPEF patients by remodeling cardiac compliance and vascular response.
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Affiliation(s)
- Michal Horowitz
- Laboratory of Environmental Physiology, Faculty of Dentistry, The Hebrew University of Jerusalem, Jerusalem, Israel
- *Correspondence: Michal Horowitz,
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4
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Tardo-Dino PE, Taverny C, Siracusa J, Bourdon S, Baugé S, Koulmann N, Malgoyre A. Effect of heat acclimation on metabolic adaptations induced by endurance training in soleus rat muscle. Physiol Rep 2021; 9:e14686. [PMID: 34405575 PMCID: PMC8371354 DOI: 10.14814/phy2.14686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 10/19/2020] [Accepted: 10/29/2020] [Indexed: 11/24/2022] Open
Abstract
Aerobic training leads to well‐known systemic metabolic and muscular alterations. Heat acclimation may also increase mitochondrial muscle mass. We studied the effects of heat acclimation combined with endurance training on metabolic adaptations of skeletal muscle. Thirty‐two rats were divided into four groups: control (C), trained (T), heat‐acclimated (H), and trained with heat acclimation (H+T) for 6 weeks. Soleus muscle metabolism was studied, notably by the in situ measurement of mitochondrial respiration with pyruvate (Pyr) or palmitoyl‐coenzyme A (PCoA), under phosphorylating conditions (V˙max) or not (V˙0). Aerobic performance increased, and retroperitoneal fat mass decreased with training, independently of heat exposure (p < 0.001 and p < 0.001, respectively). Citrate synthase and hydroxyl‐acyl‐dehydrogenase activity increased with endurance training (p < 0.001 and p < 0.01, respectively), without any effect of heat acclimation. Training induced an increase of the V˙0 and V˙max for PCoA (p < .001 and p < .01, respectively), without interference with heat acclimation. The training‐induced increase of V˙0 (p < 0.01) for pyruvate oxidation was limited when combined with heat acclimation (−23%, p < 0.01). Training and heat acclimation independently increased the V˙max for pyruvate (+60% p < 0.001 and +50% p = 0.01, respectively), without an additive effect of the combination. Heat acclimation doubled the training effect on muscle glycogen storage (p < 0.001). Heat acclimation did not improve mitochondrial adaptations induced by endurance training in the soleus muscle, possibly limiting the alteration of carbohydrate oxidation while not facilitating fatty‐acid utilization. Furthermore, the increase in glycogen storage observed after HA combined with endurance training, without the improvement of pyruvate oxidation, appears to be a hypoxic metabolic phenotype.
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Affiliation(s)
- Pierre-Emmanuel Tardo-Dino
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.,Ecole du Val-de-Grâce, Paris, France.,EDISS 205, Université Claude Bernard Lyon 1, Villeurbanne, France.,LBEPS, Université Evry, IRBA, Université Paris-Saclay, Paris, 91025, France
| | - Cindy Taverny
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France
| | - Julien Siracusa
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.,LBEPS, Université Evry, IRBA, Université Paris-Saclay, Paris, 91025, France
| | - Stéphanie Bourdon
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.,LBEPS, Université Evry, IRBA, Université Paris-Saclay, Paris, 91025, France
| | - Stéphane Baugé
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.,LBEPS, Université Evry, IRBA, Université Paris-Saclay, Paris, 91025, France
| | - Nathalie Koulmann
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.,Ecole du Val-de-Grâce, Paris, France.,EDISS 205, Université Claude Bernard Lyon 1, Villeurbanne, France.,LBEPS, Université Evry, IRBA, Université Paris-Saclay, Paris, 91025, France
| | - Alexandra Malgoyre
- Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.,LBEPS, Université Evry, IRBA, Université Paris-Saclay, Paris, 91025, France
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5
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Perez-Quintero M, Siquier-Coll J, Bartolomé I, Robles-Gil MC, Muñoz D, Maynar-Mariño M. Three weeks of passive and intervallic heat at high temperatures (100±2 °C) in a sauna improve acclimation to external heat (42±2 °C) in untrained males. J Therm Biol 2021; 96:102837. [PMID: 33627275 DOI: 10.1016/j.jtherbio.2021.102837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 12/14/2020] [Accepted: 01/01/2021] [Indexed: 12/28/2022]
Abstract
Currently, the effect of passive heat acclimation on aerobic performance is still controversial. Therefore, this study aimed to observe the effect of passive and intervallic exposure to high temperatures (100 ± 2 °C) in untrained males. Forty healthy untrained men participated in this investigation. They were randomised into a Control Group (CG; n = 18) and an Experimental Group (EG; n = 22). Both groups performed maximum incremental tests until exhaustion in normothermia (GXT1; 22 ± 2 °C), and 48h afterwards, in hyperthermia (GXT2; 42 ± 2 °C). The EG performed 9 sessions of intervallic exposure to heat (100 ± 2 °C) over 3 weeks. Subsequently, both groups performed two maximal incremental trials in normothermia (GXT3; 22 ± 2 °C) and 48h later, in hyperthermia (GXT4; 42 ± 2 °C). In each test, the maximal ergospirometric parameters and the aerobic (VT1), anaerobic (VT2) and recovery ventilatory thresholds were recorded. The Wilcoxon Test was used for intra-group comparisons and the Mann-Whitney U for inter-group comparisons. There were improvements in absolute VO2max (p = 0.049), W (p = 0.005) and O2pulse (p = 0.006) in hyperthermia. In VT1 there was an increase in W (p = 0.046), in VO2 in absolute (p = 0.025) and relative (p = 0.013) values, O2pulse (p = 0.006) and VE (p = 0.028) in hyperthermia. While W increased in hyperthermia (p = 0.022) at VT2. The results suggest that passive and intervallic acclimation at high temperatures improves performance in hyperthermia. This protocol could be implemented in athletes when they have to compete in hot environments.
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Affiliation(s)
- M Perez-Quintero
- Department of Physiology. School of Sport Sciences, University of Extremadura, Spain
| | - J Siquier-Coll
- Department of Physiology. School of Sport Sciences, University of Extremadura, Spain; Movement, Brain and Health Research Group (MOBhE), Center of Higher Education Alberta Giménez (Comillas Pontifical University), Palma de Mallorca, Balearic Islands, Spain.
| | - I Bartolomé
- Department of Physiology. School of Sport Sciences, University of Extremadura, Spain
| | - M C Robles-Gil
- Department of Didactics of Musical, Plastic and Corporal Expression, School of Teacher Training, University of Extremadura, Spain
| | - D Muñoz
- Department of Physical Education and Sport. Sport Sciences Faculty. University of Extremadura, Cáceres, Spain
| | - M Maynar-Mariño
- Department of Physiology. School of Sport Sciences, University of Extremadura, Spain
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6
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Chao CM, Chen CL, Niu KC, Lin CH, Tang LY, Lin LS, Chang CP. Hypobaric hypoxia preconditioning protects against hypothalamic neuron apoptosis in heat-exposed rats by reversing hypothalamic overexpression of matrix metalloproteinase-9 and ischemia. Int J Med Sci 2020; 17:2622-2634. [PMID: 33162790 PMCID: PMC7645337 DOI: 10.7150/ijms.47560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 08/24/2020] [Indexed: 12/03/2022] Open
Abstract
Background: Hypoxia-inducible factor-1α (HIF-1α), heat shock protein-72 (HSP-72), hemeoxygenase-1 (HO-1), and matrix metalloproteinase-9 (MMP-9) have been identified as potential therapeutic targets in the brain for cerebral ischemia. To elucidate their underlying mechanisms, we first aimed to ascertain whether these proteins participate in the pathogenesis of heat-induced ischemic damage to the hypothalamus of rats. Second, we investigated whether hypobaric hypoxia preconditioning (HHP) attenuates heat-induced hypothalamic ischemic/hypoxic injury by modulating these proteins in situ. Methods: Anesthetized rats treated with or without HHP were subjected to heat stress. Hypothalamic ischemic/hypoxic damage was evaluated by measuring hypothalamic levels of cerebral blood flow (CBF), partial oxygen pressure (PO2), and hypothalamic temperature via an implanted probe. Hypothalamic apoptotic neurons were counted by measuring the number of NeuN/caspase-3/DAPI triple-stained cells. Hypothalamic protein expression of HIF-1α, HSP-72, HO-1, and MMP-9 was determined biochemically. Results: Before the start of the thermal experiments, rats were subjected to 5 hours of HHP (0.66 ATA or 18.3% O2) daily for 5 consecutive days per week for 2 weeks, which led to significant loss of body weight, reduced brown adipose tissue (BAT) wet weight and decreased body temperature. The animals were then subjected to thermal studies. Twenty minutes after heat stress, heat-exposed rats not treated with HHP displayed significantly higher core and hypothalamic temperatures, hypothalamic MMP-9 levels, and numbers of hypothalamic apoptotic neurons but significantly lower mean blood pressure, hypothalamic blood flow, and PO2 values than control rats not exposed to heat. In heat-exposed rats, HHP significantly increased the hypothalamic levels of HIF-1α, HSP-72, and HO-1 but significantly alleviated body and hypothalamic hyperthermia, hypotension, hypothalamic ischemia, hypoxia, neuronal apoptosis and degeneration. Conclusions: HHP may protect against hypothalamic ischemic/hypoxic injury and overexpression of MMP-9 by upregulating the hypothalamic expression of HIF-1α, HSP-72, and HO-1 in rats subjected to heatstroke.
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Affiliation(s)
- Chien-Ming Chao
- Department of Intensive Care Medicine, Chi Mei Medical Center, Liouying, Tainan, Taiwan
- Department of Nursing, Min-Hwei College of Health Care Management, Tainan, Taiwan
| | - Chun-Liang Chen
- Department of Gastroenterology and General Surgery, Chi Mei Medical Hospital, Chiali, Tainan, Taiwan
| | - Ko-Chi Niu
- Department of Hyperbaric Oxygen, Chi Mei Medical Center, Tainan, Taiwan
| | - Cheng-Hsien Lin
- Department of Medicine, Mackay Medical College, New Taipei City, Taiwan
| | - Ling-Yu Tang
- Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan
| | - Lieh-Sheng Lin
- Department of Neurosurgery, Taipei Medical University Hospital, Taipei, Taiwan
| | - Ching-Ping Chang
- Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan
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7
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Mreisat A, Kanaani H, Saada A, Horowitz M. Heat acclimation mediated cardioprotection is controlled by mitochondrial metabolic remodeling involving HIF-1α. J Therm Biol 2020; 93:102691. [PMID: 33077115 DOI: 10.1016/j.jtherbio.2020.102691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 08/02/2020] [Accepted: 08/06/2020] [Indexed: 01/27/2023]
Abstract
Heat acclimation (HA) induces metabolic plasticity to resist the effects of environmental heat with cross-tolerance to novel stressors such as oxygen supply perturbations, exercise, and alike. Our previous results indicated that hypoxia inducible transcription factor (HIF-1α) contributes to this adaptive process. In the present study, we link functional studies in isolated cardiomyocytes, with molecular and biochemical studies of cardiac mitochondria and demonstrate that HA remodels mitochondrial metabolism and performance. We observed the significant role that HIF-1α plays in the HA heart, as HA reduces oxidative stress during ischemia by shifting mitochondrial substrate preference towards pyruvate, with elevated level and activity of mitochondrial LDH (LDHb), acting a pivotal role. Increased antioxidative capacity to encounter hazards is implicated. These results deepen our understanding of heat acclimation-mediated cross tolerance (HACT), in which adaptive bioenergetic-mechanisms counteract the hazards of oxidative stress.
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Affiliation(s)
- A Mreisat
- Laboratory of Environmental Physiology, Faculty of Dental Medicine, The Hebrew University of Jerusalem, Israel
| | - H Kanaani
- Laboratory of Environmental Physiology, Faculty of Dental Medicine, The Hebrew University of Jerusalem, Israel
| | - A Saada
- Department of Genetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel; Faculty of Medicine, The Hebrew University of Jerusalem, Israel.
| | - M Horowitz
- Laboratory of Environmental Physiology, Faculty of Dental Medicine, The Hebrew University of Jerusalem, Israel.
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Salgado RM, Coffman KE, Bradbury KE, Mitchell KM, Yurkevicius BR, Luippold AJ, Mayer TA, Charkoudian N, Alba BK, Fulco CS, Kenefick RW. Effect of 8 days of exercise-heat acclimation on aerobic exercise performance of men in hypobaric hypoxia. Am J Physiol Regul Integr Comp Physiol 2020; 319:R114-R122. [PMID: 32432914 DOI: 10.1152/ajpregu.00048.2020] [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] [Indexed: 11/22/2022]
Abstract
Exercise-heat acclimation (EHA) induces adaptations that improve tolerance to heat exposure. Whether adaptations from EHA can also alter responses to hypobaric hypoxia (HH) conditions remains unclear. This study assessed whether EHA can alter time-trial performance and/or incidence of acute mountain sickness (AMS) during HH exposure. Thirteen sea-level (SL) resident men [SL peak oxygen consumption (V̇o2peak) 3.19 ± 0.43 L/min] completed steady-state exercise, followed by a 15-min cycle time trial and assessment of AMS before (HH1; 3,500 m) and after (HH2) an 8-day EHA protocol [120 min; 5 km/h; 2% incline; 40°C and 40% relative humidity (RH)]. EHA induced lower heart rate (HR) and core temperature and plasma volume expansion. Time-trial performance was not different between HH1 and HH2 after 2 h (106.3 ± 23.8 vs. 101.4 ± 23.0 kJ, P = 0.71) or 24 h (107.3 ± 23.4 vs. 106.3 ± 20.8 kJ, P > 0.9). From HH1 to HH2, HR and oxygen saturation, at the end of steady-state exercise and time-trial tests at 2 h and 24 h, were not different (P > 0.05). Three of 13 volunteers developed AMS during HH1 but not during HH2, whereas a fourth volunteer only developed AMS during HH2. Heat shock protein 70 was not different from HH1 to HH2 at SL [1.9 ± 0.7 vs. 1.8 ± 0.6 normalized integrated intensities (NII), P = 0.97] or after 23 h (1.8 ± 0.4 vs. 1.7 ± 0.5 NII, P = 0.78) at HH. Our results indicate that this EHA protocol had little to no effect-neither beneficial nor detrimental-on exercise performance in HH. EHA may reduce AMS in those who initially developed AMS; however, studies at higher elevations, having higher incidence rates, are needed to confirm our findings.
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Affiliation(s)
- Roy M Salgado
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts
| | - Kirsten E Coffman
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts.,Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee
| | - Karleigh E Bradbury
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts
| | - Katherine M Mitchell
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts
| | - Beau R Yurkevicius
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts.,Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee
| | - Adam J Luippold
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts
| | - Thomas A Mayer
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts.,Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee
| | - Nisha Charkoudian
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts
| | - Billie K Alba
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts.,Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee
| | - Charles S Fulco
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts.,Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee
| | - Robert W Kenefick
- Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts
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9
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Fan L, An G, Wang S, Chen X, Liu Y, Liu Z, Ma Q, Wang J. Circular RNA Expression Profiling and Selection of Key Circular RNAs in the Hypothalamus of Heat-Acclimated Rats. Front Physiol 2019; 10:1112. [PMID: 31555146 PMCID: PMC6722210 DOI: 10.3389/fphys.2019.01112] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 08/12/2019] [Indexed: 12/31/2022] Open
Abstract
Circular RNAs (circRNAs) have vital roles in great variety of biological processes. However, expression levels and functions of circRNAs related to heat acclimation (HA) are poorly understood. This study is the first time an in-depth circRNA expression profiling were used to investigate circRNA–miRNA interactions in HA rats in order to further comprehend the mechanisms underlying HA. CircRNA expression profile was performed in rats’ hypothalamus of HA and control group with microarray assays and their functions were predicted by using Bioinformatics analysis. Differential circRNAs and their regulated downstream miRNAs and mRNAs were quantitatively validated by means of quantitative polymerase chain reaction in real-time (RT-qPCR). Enzyme-linked immunosorbent assay (ELISA) was then applied to predict the expression of proteins. In total, 53 circRNAs were expressed distinctively between the HA and Control; up- and down-regulation of circRNAs were 28 and 25, respectively, in HA (fold change > 1.5, P < 0.05). Three circRNAs and two miRNAs and three predicted mRNAs were obviously regulated after validated by RT-qPCR in HA rats. Two proteins expression were proportional to their mRNA changes. Further analysis demonstrates that circRNAs closest to HA can be categorized into three signal pathways: including rno_circRNA_014301-vs-rno-miR-3575-vs-Hif-1α, rno_circRNA_014301-vs-rno-miR-3575-vs-Lppr4, and rno_circRNA_010393-vs-rno-miR-20b-3p-vs-Mfap4 in hypoxia response pathways, substance/energy metabolism, and inflammatory response pathways. Our findings implicate that many circRNAs regulate expressions of genes that interact with each other to exert their functions during HA.
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Affiliation(s)
- Lijun Fan
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China.,Department of Human Movement Science, Tianjin University of Sport, Tianjin, China
| | - Gaihong An
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China
| | - Shang Wang
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China
| | - Xuewei Chen
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China
| | - Ying Liu
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China
| | - Zhifeng Liu
- Department of Intensive Care Medicine, General Hospital of Southern Theatre Command of People's Liberation Army, Guangzhou, China
| | - Qiang Ma
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China
| | - Jing Wang
- Department of Operational Medicine, Tianjin Institute of Environmental and Operational Medicine, Tianjin, China
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10
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Shemarova IV, Nesterov VP. Molecular Basis of Cardioprotection in Ischemic Heart Disease. J EVOL BIOCHEM PHYS+ 2019. [DOI: 10.1134/s0022093019030013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Neckář J, Hsu A, Hye Khan MA, Gross GJ, Nithipatikom K, Cyprová M, Benák D, Hlaváčková M, Sotáková-Kašparová D, Falck JR, Sedmera D, Kolář F, Imig JD. Infarct size-limiting effect of epoxyeicosatrienoic acid analog EET-B is mediated by hypoxia-inducible factor-1α via downregulation of prolyl hydroxylase 3. Am J Physiol Heart Circ Physiol 2018; 315:H1148-H1158. [PMID: 30074840 PMCID: PMC6734065 DOI: 10.1152/ajpheart.00726.2017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 07/06/2018] [Accepted: 07/18/2018] [Indexed: 12/27/2022]
Abstract
Epoxyeicosatrienoic acids (EETs) decrease cardiac ischemia-reperfusion injury; however, the mechanism of their protective effect remains elusive. Here, we investigated the cardioprotective action of a novel EET analog, EET-B, in reperfusion and the role of hypoxia-inducible factor (HIF)-1α in such action of EET-B. Adult male rats were subjected to 30 min of left coronary artery occlusion followed by 2 h of reperfusion. Administration of 14,15-EET (2.5 mg/kg) or EET-B (2.5 mg/kg) 5 min before reperfusion reduced infarct size expressed as a percentage of the area at risk from 64.3 ± 1.3% in control to 42.6 ± 1.9% and 46.0 ± 1.6%, respectively, and their coadministration did not provide any stronger effect. The 14,15-EET antagonist 14,15-epoxyeicosa-5( Z)-enoic acid (2.5 mg/kg) inhibited the infarct size-limiting effect of EET-B (62.5 ± 1.1%). Similarly, the HIF-1α inhibitors 2-methoxyestradiol (2.5 mg/kg) and acriflavine (2 mg/kg) completely abolished the cardioprotective effect of EET-B. In a separate set of experiments, the immunoreactivity of HIF-1α and its degrading enzyme prolyl hydroxylase domain protein 3 (PHD3) were analyzed in the ischemic areas and nonischemic septa. At the end of ischemia, the HIF-1α immunogenic signal markedly increased in the ischemic area compared with the septum (10.31 ± 0.78% vs. 0.34 ± 0.08%). After 20 min and 2 h of reperfusion, HIF-1α immunoreactivity decreased to 2.40 ± 0.48% and 1.85 ± 0.43%, respectively, in the controls. EET-B blunted the decrease of HIF-1α immunoreactivity (7.80 ± 0.69% and 6.44 ± 1.37%, respectively) and significantly reduced PHD3 immunogenic signal in ischemic tissue after reperfusion. In conclusion, EET-B provides an infarct size-limiting effect at reperfusion that is mediated by HIF-1α and downregulation of its degrading enzyme PHD3. NEW & NOTEWORTHY The present study shows that EET-B is an effective agonistic 14,15-epoxyeicosatrienoic acid analog, and its administration before reperfusion markedly reduced myocardial infarction in rats. Most importantly, we demonstrate that increased hypoxia-inducible factor-1α levels play a role in cardioprotection mediated by EET-B in reperfusion likely by mechanisms including downregulation of the hypoxia-inducible factor -1α-degrading enzyme prolyl hydroxylase domain protein 3.
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MESH Headings
- 8,11,14-Eicosatrienoic Acid/analogs & derivatives
- 8,11,14-Eicosatrienoic Acid/pharmacology
- 8,11,14-Eicosatrienoic Acid/therapeutic use
- Animals
- Disease Models, Animal
- Down-Regulation
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Hypoxia-Inducible Factor-Proline Dioxygenases/genetics
- Hypoxia-Inducible Factor-Proline Dioxygenases/metabolism
- Male
- Myocardial Infarction/enzymology
- Myocardial Infarction/pathology
- Myocardial Infarction/physiopathology
- Myocardial Infarction/prevention & control
- Myocardial Reperfusion Injury/enzymology
- Myocardial Reperfusion Injury/pathology
- Myocardial Reperfusion Injury/physiopathology
- Myocardial Reperfusion Injury/prevention & control
- Myocardium/enzymology
- Myocardium/pathology
- Proteolysis
- Rats, Sprague-Dawley
- Signal Transduction/drug effects
- Ventricular Function, Left/drug effects
- Ventricular Remodeling/drug effects
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Affiliation(s)
- Jan Neckář
- Department of Pharmacology and Toxicology, Medical College of Wisconsin , Milwaukee, Wisconsin
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
- Center for Experimental Medicine, Institute for Clinical and Experimental Medicine Physiology , Prague , Czech Republic
| | - Anna Hsu
- Department of Pharmacology and Toxicology, Medical College of Wisconsin , Milwaukee, Wisconsin
| | - Md Abdul Hye Khan
- Department of Pharmacology and Toxicology, Medical College of Wisconsin , Milwaukee, Wisconsin
| | - Garrett J Gross
- Department of Pharmacology and Toxicology, Medical College of Wisconsin , Milwaukee, Wisconsin
| | - Kasem Nithipatikom
- Department of Pharmacology and Toxicology, Medical College of Wisconsin , Milwaukee, Wisconsin
| | - Michaela Cyprová
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
| | - Daniel Benák
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
| | - Markéta Hlaváčková
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
| | - Dita Sotáková-Kašparová
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
| | - John R Falck
- Department of Biochemistry, University of Texas Southwestern Medical Center , Dallas, Texas
| | - David Sedmera
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
- Institute of Anatomy, First Faculty of Medicine, Charles University , Prague , Czech Republic
| | - František Kolář
- Department of Developmental Cardiology, Institute of Physiology of the Czech Academy of Sciences , Prague , Czech Republic
| | - John D Imig
- Department of Pharmacology and Toxicology, Medical College of Wisconsin , Milwaukee, Wisconsin
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Pollak A, Merin G, Horowitz M, Shochina M, Gilon D, Hasin Y. Heat Acclimatization Protects the Left Ventricle from Increased Diastolic Chamber Stiffness Immediately after Coronary Artery Bypass Surgery: A Lesson from 30 Years of Studies on Heat Acclimation Mediated Cross Tolerance. Front Physiol 2017; 8:1022. [PMID: 29311958 PMCID: PMC5732210 DOI: 10.3389/fphys.2017.01022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Accepted: 11/27/2017] [Indexed: 12/27/2022] Open
Abstract
During the period of 1986–1997 the first 4 publications on the mechanical and metabolic properties of heat acclimated rat's heart were published. The outcome of these studies implied that heat acclimation, sedentary as well as combined with exercise training, confers long lasting protection against ischemic/reperfusion insult. These results promoted a clinical study on patients with coronary artery disease scheduled for elective coronary artery bypass operations aiming to elucidate whether exploitation of environmental stress can be translated into human benefits by improving physiological recovery. During the 1998 study, immediate-post operative chamber stiffness was assessed in patients acclimatized to heat and low intensity training in the desert (spring in the Dead Sea, 17–33°C) vs. patients in colder weather (spring in non-desert areas, 6–19°C) via echocardiogram acquisition simultaneous with left atrial pressure measurement during fast intravascular fluid bolus administration. We showed that patients undergoing “heat acclimatization combined with exercise training” were less susceptible to ischemic injury, therefore expressing less diastolic dysfunction after cardiopulmonary bypass compared to non-acclimatized patients. This was the first clinical translational study on cardiac patients, while exploiting environmental harsh conditions for human benefits. The original experimental data are described and discussed in view of the past as well as the present knowledge of the protective mechanisms induced by Heat Acclimation Mediated Cross-tolerance.
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Affiliation(s)
- Arthur Pollak
- Department of Cardiology, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Gideon Merin
- Department of Cardio-Thoracic Surgery, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Michal Horowitz
- Laboratory of Environmental Physiology, Faculty of Dentistry, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Mara Shochina
- Department of Rehabilitation, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Dan Gilon
- Department of Cardiology, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yonathan Hasin
- Department of Cardiology, Hadassah Medical Center, Hebrew University of Jerusalem, Jerusalem, Israel
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Horowitz M. Heat Acclimation-Mediated Cross-Tolerance: Origins in within-Life Epigenetics? Front Physiol 2017; 8:548. [PMID: 28804462 PMCID: PMC5532440 DOI: 10.3389/fphys.2017.00548] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Accepted: 07/14/2017] [Indexed: 12/29/2022] Open
Abstract
The primary outcome of heat acclimation is increased thermotolerance, which stems from enhancement of innate cytoprotective pathways. These pathways produce “ON CALL” molecules that can combat stressors to which the body has never been exposed, via cross-tolerance mechanisms (heat acclimation-mediated cross-tolerance—HACT). The foundation of HACT lies in the sharing of generic stress signaling, combined with tissue/organ- specific protective responses. HACT becomes apparent when acclimatory homeostasis is achieved, lasts for several weeks, and has a memory. HACT differs from other forms of temporal protective mechanisms activated by exposure to lower “doses” of the stressor, which induce adaptation to higher “doses” of the same/different stressor; e.g., preconditioning, hormesis. These terms have been adopted by biochemists, toxicologists, and physiologists to describe the rapid cellular strategies ensuring homeostasis. HACT employs two major protective avenues: constitutive injury attenuation and abrupt post-insult release of help signals enhanced by acclimation. To date, the injury-attenuating features seen in all organs studied include fast-responding, enlarged cytoprotective reserves with HSPs, anti-oxidative, anti-apoptotic molecules, and HIF-1α nuclear and mitochondrial target gene products. Using cardiac ischemia and brain hypoxia models as a guide to the broader framework of phenotypic plasticity, HACT is enabled by a metabolic shift induced by HIF-1α and there are less injuries caused by Ca+2 overload, via channel or complex-protein remodeling, or decreased channel abundance. Epigenetic markers such as post-translational histone modification and altered levels of chromatin modifiers during acclimation and its decline suggest that dynamic epigenetic mechanisms controlling gene expression induce HACT and acclimation memory, to enable the rapid return of the protected phenotype. In this review the link between in vivo physiological evidence and the associated cellular and molecular mechanisms leading to HACT and its difference from short-acting cross-tolerance strategies will be discussed.
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Affiliation(s)
- Michal Horowitz
- Laboratory of Environmental Physiology, Faculty of Dentistry, Hebrew University of JerusalemJerusalem, Israel
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