Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner
GPR37L1 is a family A orphan G protein-coupled receptor (GPCR) with a putative role in blood pressure regulation and cardioprotection. In mice, genetic ablation of Gpr37l1 causes sex-dependent effects; female mice lacking Gpr37l1 (GPR37L1−/−) have a modest but significant elevation in blood pressure...
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Frontiers Media S.A.
2021-02-01
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| Series: | Frontiers in Pharmacology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphar.2020.600266/full |
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| author | Margaret A. Mouat Margaret A. Mouat Margaret A. Mouat Kristy L. Jackson Kristy L. Jackson James L. J. Coleman James L. J. Coleman James L. J. Coleman Madeleine R. Paterson Robert M. Graham Robert M. Graham Geoffrey A. Head Nicola J. Smith Nicola J. Smith Nicola J. Smith |
| author_facet | Margaret A. Mouat Margaret A. Mouat Margaret A. Mouat Kristy L. Jackson Kristy L. Jackson James L. J. Coleman James L. J. Coleman James L. J. Coleman Madeleine R. Paterson Robert M. Graham Robert M. Graham Geoffrey A. Head Nicola J. Smith Nicola J. Smith Nicola J. Smith |
| author_sort | Margaret A. Mouat |
| collection | DOAJ |
| description | GPR37L1 is a family A orphan G protein-coupled receptor (GPCR) with a putative role in blood pressure regulation and cardioprotection. In mice, genetic ablation of Gpr37l1 causes sex-dependent effects; female mice lacking Gpr37l1 (GPR37L1−/−) have a modest but significant elevation in blood pressure, while male GPR37L1−/− mice are more susceptible to cardiovascular dysfunction following angiotensin II-induced hypertension. Given that this receptor is highly expressed in the brain, we hypothesize that the cardiovascular phenotype of GPR37L1−/− mice is due to changes in autonomic regulation of blood pressure and heart rate. To investigate this, radiotelemetry was employed to characterize baseline cardiovascular variables in GPR37L1−/− mice of both sexes compared to wildtype controls, followed by power spectral analysis to quantify short-term fluctuations in blood pressure and heart rate attributable to alterations in autonomic homeostatic mechanisms. Additionally, pharmacological ganglionic blockade was performed to determine vasomotor tone, and environmental stress tests were used to assess whether cardiovascular reactivity was altered in GPR37L1−/− mice. We observed that mean arterial pressure was significantly lower in female GPR37L1−/− mice compared to wildtype counterparts, but was unchanged in male GPR37L1−/− mice. GPR37L1−/− genotype had a statistically significant positive chronotropic effect on heart rate across both sexes when analyzed by two-way ANOVA. Power spectral analysis of these data revealed a reduction in power in the heart rate spectrum between 0.5 and 3 Hz in female GPR37L1−/− mice during the diurnal active period, which indicates that GPR37L1−/− mice may have impaired cardiac vagal drive. GPR37L1−/− mice of both sexes also exhibited attenuated depressor responses to ganglionic blockade with pentolinium, indicating that GPR37L1 is involved in maintaining sympathetic vasomotor tone. Interestingly, when these mice were subjected to aversive and appetitive behavioral stressors, the female GPR37L1−/− mice exhibited an attenuation of cardiovascular reactivity to aversive, but not appetitive, environmental stimuli. Together, these results suggest that loss of GPR37L1 affects autonomic maintenance of blood pressure, giving rise to sex-specific cardiovascular changes in GPR37L1−/− mice. |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-12-16T18:07:28Z |
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| spelling | doaj.art-9784a4b06c654138ba44b8698436d3102022-12-21T22:21:53ZengFrontiers Media S.A.Frontiers in Pharmacology1663-98122021-02-011110.3389/fphar.2020.600266600266Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific MannerMargaret A. Mouat0Margaret A. Mouat1Margaret A. Mouat2Kristy L. Jackson3Kristy L. Jackson4James L. J. Coleman5James L. J. Coleman6James L. J. Coleman7Madeleine R. Paterson8Robert M. Graham9Robert M. Graham10Geoffrey A. Head11Nicola J. Smith12Nicola J. Smith13Nicola J. Smith14Molecular Pharmacology Laboratory, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaSt Vincent’s Clinical School, UNSW Sydney, Sydney, NSW, AustraliaMolecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaNeuropharmacology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, AustraliaDrug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, AustraliaMolecular Pharmacology Laboratory, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaSt Vincent’s Clinical School, UNSW Sydney, Sydney, NSW, AustraliaMolecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaNeuropharmacology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, AustraliaSt Vincent’s Clinical School, UNSW Sydney, Sydney, NSW, AustraliaMolecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaNeuropharmacology Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, AustraliaMolecular Pharmacology Laboratory, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaSt Vincent’s Clinical School, UNSW Sydney, Sydney, NSW, AustraliaMolecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Sydney, NSW, AustraliaGPR37L1 is a family A orphan G protein-coupled receptor (GPCR) with a putative role in blood pressure regulation and cardioprotection. In mice, genetic ablation of Gpr37l1 causes sex-dependent effects; female mice lacking Gpr37l1 (GPR37L1−/−) have a modest but significant elevation in blood pressure, while male GPR37L1−/− mice are more susceptible to cardiovascular dysfunction following angiotensin II-induced hypertension. Given that this receptor is highly expressed in the brain, we hypothesize that the cardiovascular phenotype of GPR37L1−/− mice is due to changes in autonomic regulation of blood pressure and heart rate. To investigate this, radiotelemetry was employed to characterize baseline cardiovascular variables in GPR37L1−/− mice of both sexes compared to wildtype controls, followed by power spectral analysis to quantify short-term fluctuations in blood pressure and heart rate attributable to alterations in autonomic homeostatic mechanisms. Additionally, pharmacological ganglionic blockade was performed to determine vasomotor tone, and environmental stress tests were used to assess whether cardiovascular reactivity was altered in GPR37L1−/− mice. We observed that mean arterial pressure was significantly lower in female GPR37L1−/− mice compared to wildtype counterparts, but was unchanged in male GPR37L1−/− mice. GPR37L1−/− genotype had a statistically significant positive chronotropic effect on heart rate across both sexes when analyzed by two-way ANOVA. Power spectral analysis of these data revealed a reduction in power in the heart rate spectrum between 0.5 and 3 Hz in female GPR37L1−/− mice during the diurnal active period, which indicates that GPR37L1−/− mice may have impaired cardiac vagal drive. GPR37L1−/− mice of both sexes also exhibited attenuated depressor responses to ganglionic blockade with pentolinium, indicating that GPR37L1 is involved in maintaining sympathetic vasomotor tone. Interestingly, when these mice were subjected to aversive and appetitive behavioral stressors, the female GPR37L1−/− mice exhibited an attenuation of cardiovascular reactivity to aversive, but not appetitive, environmental stimuli. Together, these results suggest that loss of GPR37L1 affects autonomic maintenance of blood pressure, giving rise to sex-specific cardiovascular changes in GPR37L1−/− mice.https://www.frontiersin.org/articles/10.3389/fphar.2020.600266/fullG protein-coupled receptorsex differenceshypertensionblood pressureradiotelemetryheart rate variability |
| spellingShingle | Margaret A. Mouat Margaret A. Mouat Margaret A. Mouat Kristy L. Jackson Kristy L. Jackson James L. J. Coleman James L. J. Coleman James L. J. Coleman Madeleine R. Paterson Robert M. Graham Robert M. Graham Geoffrey A. Head Nicola J. Smith Nicola J. Smith Nicola J. Smith Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner Frontiers in Pharmacology G protein-coupled receptor sex differences hypertension blood pressure radiotelemetry heart rate variability |
| title | Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner |
| title_full | Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner |
| title_fullStr | Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner |
| title_full_unstemmed | Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner |
| title_short | Deletion of Orphan G Protein-Coupled Receptor GPR37L1 in Mice Alters Cardiovascular Homeostasis in a Sex-Specific Manner |
| title_sort | deletion of orphan g protein coupled receptor gpr37l1 in mice alters cardiovascular homeostasis in a sex specific manner |
| topic | G protein-coupled receptor sex differences hypertension blood pressure radiotelemetry heart rate variability |
| url | https://www.frontiersin.org/articles/10.3389/fphar.2020.600266/full |
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