Document Detail


Overexpression of nerve growth factor by murine smooth muscle cells: The role of the p75 neurotrophin receptor on sympathetic and sensory sprouting.
MedLine Citation:
PMID:  23322532     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Elevating levels of nerve growth factor (NGF) can have pronounced effects on the survival and maintenance of distinct populations of neurons. We have generated a line of transgenic mice in which NGF is expressed under the control of the smooth muscle α-actin promoter. These transgenic mice have augmented levels of NGF protein in the descending colon and urinary bladder, and as a consequence these tissues display increased densities of NGF-sensitive sympathetic efferents and sensory afferents. Here, we provide a thorough examination of sympathetic and sensory axonal densities in the descending colon and urinary bladder of NGF transgenic mice with and without the expression of the p75 neurotrophin receptor (p75NTR). In response to elevated NGF levels, sympathetic axons (immunostained for tyrosine hydroxylase) undergo robust collateral sprouting in the descending colon and urinary bladder of adult transgenic mice (i.e., those tissues having smooth muscle cells); this sprouting is not augmented in the absence of p75NTR expression. As for sensory axons (immunostained for calcitonin gene-related peptide) in the urinary bladders of transgenic mice, fibers undergo sprouting that is further increased in the absence of p75NTR expression. Sympathetic axons are also seen invading the sensory ganglia of transgenic mice; these fibers form perineuronal plexuses around a subpopulation of sensory somata. Our results reveal that elevated levels of NGF in target tissues stimulate sympathetic and sensory axonal sprouting, and that an absence of p75NTR by sensory afferents (but not by sympathetic efferents) leads to a further increase of terminal arborization in certain NGF-rich peripheral tissues. J. Comp. Neurol., 2013. © 2013 Wiley Periodicals, Inc.
Authors:
Casey N Petrie; Laura J Smithson; Anne-Marie Crotty; Bernadeta Michalski; Margaret Fahnestock; Michael D Kawaja
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-16
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  -     ISSN:  1096-9861     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Wiley Periodicals, Inc.
Affiliation:
Centre for Neuroscience Studies, Kingston ON K7L 3N6.
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