Spinal endothelin content is elevated after moderate local trauma in the rat to levels associated with locomotor dysfunction after intrathecal injection.

Abstract:

:The role of endothelin (ET) in the pathophysiology of secondary neural damage after experimental spinal cord injury (SCI) was examined in a rat model of weight-drop contusion injury. Initial studies demonstrated a significant increase in spinal ET concentrations in a 7.5-mm segment of tissue (centered at the impact site) at 30 min, 4 h, and 24 h after a moderate (50 g-cm) contusion injury. Subsequent experiments were aimed at reproducing these elevations by the intrathecal (i.t.) administration of ET and observing the effect on locomotor function. These studies showed that i.t. dosage of 9.6 ng produced spinal cord elevations of ET similar to those seen 30 min after moderate SCI as well as mild locomotor deficits. A 48 ng dose of ET resulted in moderate to severe locomotor deficits that were associated with spinal ET elevations much greater than those seen after injury. The mild deficits attributable to the lower dose of ET could contribute to the pathophysiological actions of other purported secondary injury mediators. The more pronounced locomotor deficits associated with the higher dose could be of relevance for severe SCI.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Salzman SK,Acosta R,Beck G,Madden J,Boxer B,Ohlstein EH

doi

10.1089/neu.1996.13.93

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

93-101

issue

2

eissn

0897-7151

issn

1557-9042

journal_volume

13

pub_type

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