TY - JOUR
T1 - Riluzole disrupts autoresuscitation from hypothermic respiratory arrest in neonatal hamsters but not rats
AU - Fong, Angelina Y.
AU - Marshall, Lieneke H.
AU - Milsom, William K.
PY - 2009/5/15
Y1 - 2009/5/15
N2 - We examined the effect of riluzole on expression of the central respiratory rhythm and the ability of neonates to autoresuscitate from hypothermic respiratory arrest using in vitro brainstem-spinal cord preparations of rats and hamsters. At a constant temperature of 27 °C, riluzole (5-200 μM) decreased the burst amplitude of respiratory-related motor discharge, but had little effect on the fictive respiratory frequency in rat preparations. In contrast, in hamster preparations, riluzole reduced fictive respiratory frequency, but had little effect on burst amplitude. Hamster preparations were more cold-tolerant than rat preparations, with respiratory arrest and autoresuscitation occurring at lower temperatures during cooling of the preparation. This difference was removed by incubation with riluzole (5 μM); riluzole significantly increased the temperature at which fictive respiration arrested and restarted in hamster preparations, but had no effect in rat preparations. The species differences observed in this study may reflect fundamental differences in the relative role of riluzole-sensitive mechanisms in the expression of the respiratory rhythm in early development of an altricial vs. a more precocial species.
AB - We examined the effect of riluzole on expression of the central respiratory rhythm and the ability of neonates to autoresuscitate from hypothermic respiratory arrest using in vitro brainstem-spinal cord preparations of rats and hamsters. At a constant temperature of 27 °C, riluzole (5-200 μM) decreased the burst amplitude of respiratory-related motor discharge, but had little effect on the fictive respiratory frequency in rat preparations. In contrast, in hamster preparations, riluzole reduced fictive respiratory frequency, but had little effect on burst amplitude. Hamster preparations were more cold-tolerant than rat preparations, with respiratory arrest and autoresuscitation occurring at lower temperatures during cooling of the preparation. This difference was removed by incubation with riluzole (5 μM); riluzole significantly increased the temperature at which fictive respiration arrested and restarted in hamster preparations, but had no effect in rat preparations. The species differences observed in this study may reflect fundamental differences in the relative role of riluzole-sensitive mechanisms in the expression of the respiratory rhythm in early development of an altricial vs. a more precocial species.
KW - Autoresuscitation
KW - Central respiratory rhythm
KW - Control of breathing
KW - Hamster
KW - Neonate
KW - Rat
KW - Respiratory arrest
KW - Riluzole
UR - http://www.scopus.com/inward/record.url?scp=67349278860&partnerID=8YFLogxK
U2 - 10.1016/j.resp.2009.03.004
DO - 10.1016/j.resp.2009.03.004
M3 - Article
C2 - 19442934
AN - SCOPUS:67349278860
SN - 1569-9048
VL - 166
SP - 175
EP - 183
JO - Respiratory Physiology and Neurobiology
JF - Respiratory Physiology and Neurobiology
IS - 3
ER -