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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Interaction between angiotensin II and GABA in the spinal cord regulates sympathetic vasomotor activity in Goldblatt hypertension

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Author(s):
Milanez, Maycon I. O. [1] ; Nishi, Erika E. [1] ; Rocha, Antonio A. [1] ; Bergamaschi, Cassia T. [1] ; Campos, Ruy R. [1]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Paulo, Escola Paulista Med, Dept Physiol, Cardiovasc Div, Rua Botucatu, 862, Ground Floor, Sao Paulo 04023060, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Neuroscience Letters; v. 728, MAY 29 2020.
Web of Science Citations: 0
Abstract

Previous studies have been described changes in brain regions contributing to the sympathetic vasomotor overactivity in Goldblatt hypertension (2K1C). Furthermore, changes in the spinal cord are also involved in the cardiovascular and autonomic dysfunction in renovascular hypertension, as intrathecal (i.t) administration of Losartan (Los) causes a robust hypotensive/sympathoinhibitory response in 2K1C but not in control rats. The present study evaluated the role of spinal gamma-aminobutyric acid (GABA)-ergic inputs in the control of sympathetic vasomotor activity in the 2K1C rats. Hypertension was induced by clipping the renal artery. After six weeks, a catheter (PE-10) was inserted into the subarachnoid space and advanced to the T10-11 vertebral level in urethane-anaesthetized rats. The effects of i.t injection of bicuculline (Bic) on blood pressure (BP), renal and splanchnic sympathetic nerve activity (rSNA and sSNA, respectively) were evaluated over 40 consecutive minutes in the presence or absence of spinal AT1 antagonism. I.t. Bic triggered a more intense pressor and sympathoexcitatory response in 2K1C rats, however, these responses were attenuated by previous i.t. Los. No differences in the gene expression of GAD 65 and GABA-A receptors subunits in the spinal cord segments were found. Thus, the sympathoexcitation induced by spinal GABA-A blockade is dependent of local AT1 receptor in 2K1C but not in control rats. Excitatory angiotensinergic inputs to sympathetic preganglionic neurons are tonic controlled by spinal GABAergic actions in Goldblatt hypertension. (AU)

FAPESP's process: 18/02671-3 - Functional and molecular actions of renal nerve in experimental chronic renal failure
Grantee:Cassia Marta de Toledo Bergamaschi
Support type: Regular Research Grants
FAPESP's process: 18/01898-4 - Evaluation of brain-spinal projections in the temporal establishment of renal sympathetic hyperactivation in Renovascular Hypertension
Grantee:Maycon Igor de Oliveira Milanez
Support type: Scholarships in Brazil - Doctorate