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The influences of p75 neurotrophin receptor and brain-derived neurotrophic factor in the sympathetic innervation of target tissues during murine postnatal development.
- Source :
-
Autonomic neuroscience : basic & clinical [Auton Neurosci] 2005 Mar 31; Vol. 118 (1-2), pp. 32-42. - Publication Year :
- 2005
-
Abstract
- Post-ganglionic sympathetic neurons express the p75 neurotrophin receptor (p75NTR) and brain-derived neurotrophic factor (BDNF), which together have been implicated in controlling the degree of efferent innervation of peripheral organs [Kohn, J., Aloyz, R.S., Toma, J.G., Haak-Frendscho, M., Miller, F.D. 1999. Functionally Antagonistic Interactions between the TrkA and p75 Neurotrophin Receptors Regulate Sympathetic Neuron Growth and Target Innervation. J. Neurosci. 19, 5393-5408]. To examine this concept further, we developed null mutant mice lacking both p75NTR and BDNF, and assessed whether the loss of this receptor-ligand interaction negatively impacts the degree of sympathetic innervation to various target tissues. Between postnatal days 10 and 14, hearts, urinary bladders, kidneys, and submandibular salivary glands were isolated from p75(-/-)/BDNF-/-, p75-/-, BDNF-/-, and wild type siblings. Sympathetic axons were visualized using tyrosine hydroxylase (TH) immunohistochemistry, and TH protein levels were quantified by immunoblotting. Concerning the sympathetic innervation of the heart, urinary bladder and kidneys, no differences were seen in single and double null mutant mice, as compared with their wild type siblings. Sympathetic innervation of the submandibular salivary gland was, however, increased in both p75-/- and p75(-/-)/BDNF-/- mice over control mice. These results reveal that an absence of p75NTR and/or BDNF expression does not perturb the degree of sympathetic innervation of many peripheral tissues during postnatal development, and that a lack of p75NTR expression may actually enhance the density of these efferent fibers in other target tissues, such as the salivary glands.
- Subjects :
- Animals
Animals, Newborn
Blotting, Western methods
Body Weight genetics
Brain-Derived Neurotrophic Factor deficiency
Immunohistochemistry methods
Kidney growth & development
Kidney innervation
Kidney metabolism
Mice
Mice, Knockout
Myocardium metabolism
Receptor, Nerve Growth Factor
Receptors, Nerve Growth Factor deficiency
Submandibular Gland growth & development
Submandibular Gland innervation
Submandibular Gland metabolism
Tyrosine 3-Monooxygenase metabolism
Urinary Bladder growth & development
Urinary Bladder innervation
Urinary Bladder metabolism
Brain-Derived Neurotrophic Factor metabolism
Receptors, Nerve Growth Factor metabolism
Sympathetic Nervous System growth & development
Sympathetic Nervous System metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1566-0702
- Volume :
- 118
- Issue :
- 1-2
- Database :
- MEDLINE
- Journal :
- Autonomic neuroscience : basic & clinical
- Publication Type :
- Academic Journal
- Accession number :
- 15795176
- Full Text :
- https://doi.org/10.1016/j.autneu.2004.12.004