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Grobe CC, Reho JJ, Brown-Williams D, Ziegler AA, Mathieu NM, Lawton SB, Fekete EM, Brozoski DT, Wackman KK, Burnett CM, Nakagawa P, Sigmund CD, Segar JL, Grobe JL. Cardiometabolic Effects of DOCA-Salt in Mice Depend on Ambient Temperature. Hypertension 2023; 80:1871-1880. [PMID: 37470185 PMCID: PMC10528934 DOI: 10.1161/hypertensionaha.122.20415] [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: 10/04/2022] [Accepted: 07/10/2023] [Indexed: 07/21/2023]
Abstract
BACKGROUND Mice prefer warmer environments than humans. For this reason, behavioral and physiological thermoregulatory responses are engaged by mice in response to a standard room temperature of 22 to 24 °C. Autonomic mechanisms mediating thermoregulatory responses overlap with mechanisms activated in hypertension, and, therefore, we hypothesized that housing at thermoneutral temperatures (TNs; 30 °C) would modify the cardiometabolic effects of deoxycorticosterone acetate (DOCA)-salt in mice. METHODS The effects of DOCA-salt treatment upon ingestive behaviors, energy expenditure, blood pressure, heart rate (HR), and core temperature were assessed in C57BL/6J mice housed at room temperature or TN. RESULTS Housing at TN reduced food intake, energy expenditure, blood pressure, and HR and attenuated HR responses to acute autonomic blockade by chlorisondamine. At room temperature, DOCA-salt caused expected increases in fluid intake, sodium retention in osmotically inactive pools, blood pressure, core temperature, and also caused expected decreases in fat-free mass, total body water, and HR. At TN, the effects of DOCA-salt upon fluid intake, fat gains, hydration, and core temperature were exaggerated, but effects on energy expenditure and HR were blunted. Effects of DOCA-salt upon blood pressure were similar for 3 weeks and exaggerated by TN housing in the fourth week. CONCLUSIONS Ambient temperature robustly influences behavioral and physiological functions in mice, including metabolic and cardiovascular phenotype development in response to DOCA-salt treatment. Studying cardiometabolic responses of mice at optimal ambient temperatures promises to improve the translational relevance of rodent models.
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Affiliation(s)
- Connie C. Grobe
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226
| | - John J. Reho
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI 53226
| | | | - Alisha A. Ziegler
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Natalia M. Mathieu
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Samuel B.R. Lawton
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Eva M. Fekete
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Daniel T. Brozoski
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Kelsey K. Wackman
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Colin M.L. Burnett
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Pablo Nakagawa
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Curt D. Sigmund
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Jeffrey L. Segar
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI 53226
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226
| | - Justin L. Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI 53226
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI 53226
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI 53226
- Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, WI 53226
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Truong KM, Pessah IN. Comparison of Chlorantraniliprole and Flubendiamide Activity Toward Wild-Type and Malignant Hyperthermia-Susceptible Ryanodine Receptors and Heat Stress Intolerance. Toxicol Sci 2020; 167:509-523. [PMID: 30329129 DOI: 10.1093/toxsci/kfy256] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Chlorantraniliprole (CP) and flubendiamide (FD) are widely used in agriculture globally to control lepidopteran pests. Both insecticides target ryanodine receptors (RyRs) and promote Ca2+ leak from sarcoplasmic reticulum (SR) within insect skeletal muscle yet are purportedly devoid of activity toward mammalian RyR1 and muscle. RyRs are ion channels that regulate intracellular Ca2+ release from SR during physiological excitation-contraction coupling. Mutations in RYR1 genes confer malignant hyperthermia susceptibility (MHS), a potentially lethal pharmacogenetic disorder in humans and animals. Compared with vehicle control, CP (10 µM) triggers a 65-fold higher rate of Ca2+ efflux from Ca2+-loaded mammalian WT-RyR1 SR vesicles, whereas FD (10 µM) produces negligible influence on Ca2+ leak. We, therefore, compared whether CP or FD differentially influence patterns of high-affinity [3H]ryanodine ([3H]Ry) binding to RyR1 isolated from muscle SR membranes prepared from adult C57BL/6J mice expressing WT, homozygous C-terminal MHS mutation T4826I, or heterozygous N-terminal MHS mutation R163C. Basal [3H]Ry binding differed among genotypes with rank order T4826I ≫R163C∼WT, regardless of [Ca2+] in the assay medium. Both CP and FD (0.01-100 µM) elicited concentration-dependent increase in [3H]Ry binding, although CP showed greater efficacy regardless of genotype or [Ca2+]. Exposure to CP (500 mg/kg; p.o) failed to shift intolerance to heat stress (38°C) characteristic of R163C and T4826I MHS mice, nor cause lethality in WT mice. Although nM-µM of either diamide is capable of differentially altering WT and MHS RyR1 conformation in vitro, human RyR1 mutations within putative diamide N- and C-terminal interaction domains do not alter heat stress intolerance (HSI) in vivo.
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Affiliation(s)
| | - Isaac N Pessah
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, California 95616-5270
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Short-term Heat Exposure Promotes Hippocampal Neurogenesis via Activation of Angiotensin II Type 1 Receptor in Adult Rats. Neuroscience 2018; 385:121-132. [PMID: 29902505 DOI: 10.1016/j.neuroscience.2018.05.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 05/07/2018] [Accepted: 05/30/2018] [Indexed: 12/31/2022]
Abstract
Angiotensin II (Ang II) synthesized in response to body fluid loss caused by actions such as sweating and breathing is today considered as one of the essential factors for promoting hippocampal neurogenesis. Because heat stimuli, along with exercise, increase systemic levels of Ang II, the effects of short-term heat exposure on hippocampal neurogenesis were examined in adult male rats. When rats were exposed daily to a 1-h heat treatment (36.0 ± 0.1 °C) during a 7-d experimental period, the number of doublecortin-immunoreactive newborn cells in the hippocampal dentate gyrus was increased approximately 1.4-fold compared with that in controls that were exposed to a normothermic environment (25.0 ± 0.8 °C). No significant change was observed in the number of Ki-67-immunoreactive stem cells. Western blot and immunohistochemical analyses revealed an enhancement of vascular endothelial growth factor (VEGF) expression in hippocampal astrocytes following short-term heat exposure. These beneficial effects of short-term heat exposure were prevented when an antagonist for Ang II type 1 receptor (AT1R), candesartan, was given orally. These results indicate that short-term heat exposure enhances adult neurogenesis via activation of AT1R in the hippocampal dentate gyrus, in which VEGF may participate by promoting cell proliferation and/or newborn neuron survival.
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Barney CC, Kuhrt DM. Intermittent heat exposure and thirst in rats. Physiol Rep 2016; 4:4/8/e12767. [PMID: 27095836 PMCID: PMC4848724 DOI: 10.14814/phy2.12767] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 03/24/2016] [Indexed: 11/24/2022] Open
Abstract
Adequate water intake, supporting both cardiovascular function and evaporative cooling, is a critical factor in mitigating the effects of heat waves, which are expected to increase with global warming. However, the regulation of water intake during periods of intermittent heat exposure is not well understood. In this study, the effects of access to water or no access during intermittent heat exposure were assessed using male Sprague-Dawley rats exposed to 37.5°C for 4 h/day. After 7 days of intermittent heat exposure, reductions in evaporative water loss were observed in all animals and reductions in water intake following heat exposure occurred as the days of heat exposure increased. Rats that were not allowed water during the 7 days of exposure had decreased rehydration levels, however, rats allowed access to water increased water intake during exposure and exhibited higher overall rehydration levels over the same time period. Peripheral administration of angiotensinII, mimicking activation of volemic thirst, or hypertonic saline solution, activating intracellular thirst, did not result in alteration of water intake in rats exposed to heat with access to water compared to control rats. In contrast, rats exposed to heat without access to water had reduced water intake after administration of hypertonic saline and increased water intake after administration of angiotensinIIcompared to control rats. These experiments demonstrate that thirst responses to intermittent heat exposure are altered by providing water during heat exposure and that intermittent heat exposure without access to water alters drinking responses to both intracellular and extracellular thirst challenges.
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Affiliation(s)
| | - David M Kuhrt
- Department of Biology, Hope College, Holland, Michigan
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García-Arroyo FE, Cristóbal M, Arellano-Buendía AS, Osorio H, Tapia E, Soto V, Madero M, Lanaspa MA, Roncal-Jiménez C, Bankir L, Johnson RJ, Sánchez-Lozada LG. Rehydration with soft drink-like beverages exacerbates dehydration and worsens dehydration-associated renal injury. Am J Physiol Regul Integr Comp Physiol 2016; 311:R57-65. [PMID: 27053647 DOI: 10.1152/ajpregu.00354.2015] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 03/31/2016] [Indexed: 12/18/2022]
Abstract
Recurrent dehydration, such as commonly occurs with manual labor in tropical environments, has been recently shown to result in chronic kidney injury, likely through the effects of hyperosmolarity to activate both vasopressin and aldose reductase-fructokinase pathways. The observation that the latter pathway can be directly engaged by simple sugars (glucose and fructose) leads to the hypothesis that soft drinks (which contain these sugars) might worsen rather than benefit dehydration associated kidney disease. Recurrent dehydration was induced in rats by exposure to heat (36°C) for 1 h/24 h followed by access for 2 h to plain water (W), a 11% fructose-glucose solution (FG, same composition as typical soft drinks), or water sweetened with noncaloric stevia (ST). After 4 wk plasma and urine samples were collected, and kidneys were examined for oxidative stress, inflammation, and injury. Recurrent heat-induced dehydration with ad libitum water repletion resulted in plasma and urinary hyperosmolarity with stimulation of the vasopressin (copeptin) levels and resulted in mild tubular injury and renal oxidative stress. Rehydration with 11% FG solution, despite larger total fluid intake, resulted in greater dehydration (higher osmolarity and copeptin levels) and worse renal injury, with activation of aldose reductase and fructokinase, whereas rehydration with stevia water had opposite effects. In animals that are dehydrated, rehydration acutely with soft drinks worsens dehydration and exacerbates dehydration associated renal damage. These studies emphasize the danger of drinking soft drink-like beverages as an attempt to rehydrate following dehydration.
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Affiliation(s)
- Fernando E García-Arroyo
- Laboratory of Renal Physiopathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico; Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Magdalena Cristóbal
- Laboratory of Renal Physiopathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico; Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Abraham S Arellano-Buendía
- Laboratory of Renal Physiopathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico; Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Horacio Osorio
- Laboratory of Renal Physiopathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico; Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Edilia Tapia
- Laboratory of Renal Physiopathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico; Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Virgilia Soto
- Department of Pathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Magdalena Madero
- Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico
| | - Miguel A Lanaspa
- Division of Renal Diseases and Hypertension, University of Colorado, Aurora, Colorado; and
| | - Carlos Roncal-Jiménez
- Division of Renal Diseases and Hypertension, University of Colorado, Aurora, Colorado; and
| | - Lise Bankir
- INSERM, Centre de Recherche des Cordeliers, Paris, France
| | - Richard J Johnson
- Division of Renal Diseases and Hypertension, University of Colorado, Aurora, Colorado; and
| | - Laura-Gabriela Sánchez-Lozada
- Laboratory of Renal Physiopathology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico; Department of Nephrology, Instituto Nacional de Cardiología-Ignacio Chávez, Mexico City, Mexico;
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Moorhead KA, Discipulo ML, Hu J, Moorhead RC, Johns JL. Alterations due to dilution and anticoagulant effects in hematologic analysis of rodent blood samples on the Sysmex XT-2000iV. Vet Clin Pathol 2016; 45:215-24. [DOI: 10.1111/vcp.12338] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Kaitlin A. Moorhead
- Department of Comparative Medicine; Stanford School of Medicine; Stanford CA USA
| | | | - Jing Hu
- Department of Comparative Medicine; Stanford School of Medicine; Stanford CA USA
| | - Roberta C. Moorhead
- Department of Comparative Medicine; Stanford School of Medicine; Stanford CA USA
| | - Jennifer L. Johns
- Department of Comparative Medicine; Stanford School of Medicine; Stanford CA USA
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