trkA modulation of developing somatosensory neurons in oro-facial tissues: Tooth pulp fibers are absent in trkA knockout mice

被引:42
作者
Matsuo, S
Ichikawa, H
Henderson, TA
Silos-Santiago, I
Barbacid, M
Arends, JJA
Jacquin, MF
机构
[1] Washington Univ, Sch Med, St Louis, MO 63110 USA
[2] Okayama Univ, Sch Dent, Dept Oral Anat 2, Okayama 7008525, Japan
[3] Bristol Myers Squibb Co, Mol Biol, Princeton, NJ 08543 USA
关键词
immunohistochemistry; mechanoreceptive afferent; nerve development; nerve growth factor receptor; nociceptive afferent; trigeminal nerve;
D O I
10.1016/S0306-4522(01)00223-8
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
To investigate the nerve growth factor requirement of developing oro-facial somatosensory afferents, we have studied the survival of sensory fibers subserving nociception, mechanoreception or proprioception in receptor tyrosine kinase (trkA) knockout mice using immunohistochemistry. trkA receptor null mutant mice lack nerve fibers in tooth pulp, including sympathetic fibers, and showed only sparse innervation of the periodontal ligament. Ruffini endings were formed definitively in the periodontal ligament of the trkA knockout mice, although calcitonin gene-related peptide- and substance P-immunoreactive fibers were reduced in number or had disappeared completely. trkA gene deletion had also no obvious effect on the formation of Meissner corpuscles in the palate. In the vibrissal follicle, however, some mechanoreceptive afferents were sensitive for trkA gene deletion, confirming a previous report [Fundin et al. (1997) Dev. Biol. 190, 94-116]. Moreover, calretinin-positive fibers innervating longitudinal lanceolate endings were completely lost in trkA knockout mice, as were the calretinin-containing parent cells in the trigeminal ganglion. These results indicate that trkA is indispensable for developing nociceptive neurons innervating oral tissues, but not for developing mechanoreceptive neurons innervating oral tissues (Ruffini endings and Meissner corpuscles), and that calretinin-containing, trkA dependent neurons in the trigeminal ganglion normally participate in mechanoreception through longitudinal lanceolate endings of the vibrissal follicle. (C) 2001 IBRO. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:747 / 760
页数:14
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