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Activation of Kinin B1R Upregulates ADAM17 and Results in ACE2 Shedding in Neurons

Department of Pharmacology and Toxicology, Brody School of Medicine, East Carolina University, Greenville, NC 27834, USA
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2021, 22(1), 145;
Received: 1 December 2020 / Revised: 21 December 2020 / Accepted: 22 December 2020 / Published: 25 December 2020
Angiotensin converting enzyme 2 (ACE2) is a critical component of the compensatory axis of the renin angiotensin system. Alterations in ACE2 gene and protein expression, and activity mediated by A Disintegrin And Metalloprotease 17 (ADAM17), a member of the “A Disintegrin And Metalloprotease” (ADAM) family are implicated in several cardiovascular and neurodegenerative diseases. We previously reported that activation of kinin B1 receptor (B1R) in the brain increases neuroinflammation, oxidative stress and sympathoexcitation, leading to the development of neurogenic hypertension. We also showed evidence for ADAM17-mediated ACE2 shedding in neurons. However, whether kinin B1 receptor (B1R) activation has any role in altering ADAM17 activity and its effect on ACE2 shedding in neurons is not known. In this study, we tested the hypothesis that activation of B1R upregulates ADAM17 and results in ACE2 shedding in neurons. To test this hypothesis, we stimulated wild-type and B1R gene-deleted mouse neonatal primary hypothalamic neuronal cultures with a B1R-specific agonist and measured the activities of ADAM17 and ACE2 in neurons. B1R stimulation significantly increased ADAM17 activity and decreased ACE2 activity in wild-type neurons, while pretreatment with a B1R-specific antagonist, R715, reversed these changes. Stimulation with specific B1R agonist Lys-Des-Arg9-Bradykinin (LDABK) did not show any effect on ADAM17 or ACE2 activities in neurons with B1R gene deletion. These data suggest that B1R activation results in ADAM17-mediated ACE2 shedding in primary hypothalamic neurons. In addition, stimulation with high concentration of glutamate significantly increased B1R gene and protein expression, along with increased ADAM17 and decreased ACE2 activities in wild-type neurons. Pretreatment with B1R-specific antagonist R715 reversed these glutamate-induced effects suggesting that indeed B1R is involved in glutamate-mediated upregulation of ADAM17 activity and ACE2 shedding. View Full-Text
Keywords: ACE2; ADAM17; kinin B1R; glutamate; shedding ACE2; ADAM17; kinin B1R; glutamate; shedding
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MDPI and ACS Style

Parekh, R.U.; Sriramula, S. Activation of Kinin B1R Upregulates ADAM17 and Results in ACE2 Shedding in Neurons. Int. J. Mol. Sci. 2021, 22, 145.

AMA Style

Parekh RU, Sriramula S. Activation of Kinin B1R Upregulates ADAM17 and Results in ACE2 Shedding in Neurons. International Journal of Molecular Sciences. 2021; 22(1):145.

Chicago/Turabian Style

Parekh, Rohan U., and Srinivas Sriramula. 2021. "Activation of Kinin B1R Upregulates ADAM17 and Results in ACE2 Shedding in Neurons" International Journal of Molecular Sciences 22, no. 1: 145.

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