Mechanosensitive currents in putative aortic baroreceptor neurons in vitro.

Abstract:

:1. Whole cell patch-clamp experiments were conducted to determine whether rat aortic baroreceptor neurons contain mechano-sensitive conductances. 2. Putative aortic baroreceptor neurons in the nodose ganglia were identified by injecting DiI onto the adventitia of the aortic arch. Nodose ganglia neurons were dissociated after > or = 1 wk. A fluorescein-conjugated tetanus toxin fragment was used to confirm that the cells labeled with DiI in culture were neurons. 3. Hypoosmotic stretch significantly increased the conductance of DiI-labeled neurons (n = 19). The reversal potential of the response was -11 +/- 1 (SE) mV. 4. In experiments on unlabeled neurons, only 7 of 13 cells showed increases in conductance. BC3H1 cells, a mouse tumor cell line, showed no changes in conductance. 5. Gadolinium (20 microM), a putative blocker of mechanosensitive channels, prevented the increase in conductance produced by hypoosmolality in seven of seven labeled cells. Equimolar concentrations of lanthanum (n = 6) and omega-conotoxin GVIA (1 microM, n = 4), which block voltage-gated calcium channels, failed to significantly affect the inward current.

journal_name

J Neurophysiol

authors

Cunningham JT,Wachtel RE,Abboud FM

doi

10.1152/jn.1995.73.5.2094

subject

Has Abstract

pub_date

1995-05-01 00:00:00

pages

2094-8

issue

5

eissn

0022-3077

issn

1522-1598

journal_volume

73

pub_type

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