当前位置： SCI文献检索 > PAIN期刊下所有文献 > Intraplantar injection of nerve growth factor into the rat hind paw: local edema and effects on thermal nociceptive threshold.

Intraplantar injection of nerve growth factor into the rat hind paw: local edema and effects on thermal nociceptive threshold.

Abstract：

:Nerve growth factor (NGF) is known to produce hyperalgesia as well as to stimulate synthesis of neuropeptides in dorsal root ganglia (DRG). In the present study, we wanted to determine the effects of local NGF administration and assess to which extent mast cell-dependent factors are mediating NGF responses. Rats received 1 daily unilateral intraplantar injection for 3 days. Local edema (days 1-3), changes in thermal nociceptive threshold (days 1-4), and the content of calcitonin gene-related peptide (CGRP) and substance P (SP) in the sciatic nerve (day 4), were determined. NGF injection caused edema which was absent in rats pretreated with compound 48/80 as well as in rats treated neonatally with capsaicin ('capsaicin denervation'). NGF-induced edema was not reduced by the neurokinin-1 receptor antagonist SR140333, but attenuated by the CGRP receptor antagonist CGRP[8-37]. On each day, NGF injection caused a decrease in thermal nociceptive threshold which lasted for less than 3 h. Capsaicin denervation, but not treatment with indomethacin, abolished NGF-induced thermal hyperalgesia. Treatment with compound 48/80 attenuated hyperalgesia produced by the first, but not by subsequent, NGF injections. On day 4, 24 h after the last of 3 NGF injections, thermal nociceptive threshold was not different from control values, but at that time, CGRP and SP were elevated in the sciatic nerve. We suggest therefore that NGF-induced local edema was caused by mast cell-derived vasoactive compounds which act together with afferent neuron-derived CGRP to increase vascular permeability. NGF-induced thermal hyperalgesia most likely was caused by an increased sensitivity of peripheral endings of capsaicin sensitive afferents. This effect of NGF was not mediated by products of the cyclooxygenase pathway, and was also observed in mast cell-depleted rats.

journal_name

Pain

journal_title

Pain

authors

Amann R,Schuligoi R,Herzeg G,Donnerer J

doi

10.1016/0304-3959(95)00120-4

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

323-329

issue

eissn

0304-3959

issn

1872-6623

pii

00006396-199602000-00014

journal_volume

pub_type

杂志文章

在线工具

Intraplantar injection of nerve growth factor into the rat hind paw: local edema and effects on thermal nociceptive threshold.