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Title: Periwound dopaminergic sprouting is dependent on numbers of wound macrophages.
Austin Authors: Batchelor, Peter Egerton;Porritt, Michelle J;Nilsson, S K;Bertoncello, I;Donnan, Geoffrey A ;Howells, David William
Affiliation: Departments of Medicine and Neurology, University of Melbourne, Austin and Repatriation Medical Centre, Heidelberg Victoria 3084, Australia
Issue Date: 1-Mar-2002
Publication information: The European Journal of Neuroscience; 15(5): 826-32
Abstract: Injury to many regions of the central nervous system, including the striatum, results in a periwound or 'abortive' sprouting response. In order to directly evaluate whether macrophages play an important role in stimulating periwound sprouting, osteopetrotic (op/op) mice, which when young are deficient in a variety of macrophage subtypes, were given striatal wounds and the degree of dopaminergic sprouting subsequently assessed. Two weeks postinjury, significantly fewer wound macrophages were present in the striata of op/op mice compared with controls (144 +/- 30.1 in op/op mice vs. 416.6 +/- 82.3 in controls, P < 0.005, analysis performed on a section transecting the middle of the wound). Dopamine transporter immunohistochemistry revealed a marked decrease in the intensity of periwound sprouting in the op/op group of animals. Quantification of this effect using [H3]-mazindol autoradiography confirmed that periwound sprouting was reduced significantly in the op/op mice compared with controls (71.4 +/- 21.7 fmol/mg protein in op/op mice vs. 210.7 +/- 27.1 fmol/mg protein in controls, P < 0.0005). In the two groups of animals the magnitude of the sprouting response in individuals was closely correlated with the number of wound macrophages (R = 0.83, R2 = 0.69). Our findings provide strong support for the crucial involvement of macrophages in inducing dopaminergic sprouting after striatal injury.
Gov't Doc #: 11906524
Type: Journal Article
Subjects: Adrenergic Uptake Inhibitors.diagnostic use
Brain Injuries.metabolism.physiopathology
Carboxylic Ester Hydrolases.metabolism
Cell Count
Corpus Striatum.cytology.injuries.metabolism
Growth Cones.metabolism.ultrastructure
Macrophage-1 Antigen.metabolism
Mazindol.diagnostic use
Mice, Inbred C57BL
Mice, Mutant Strains
Nerve Regeneration.physiology
Presynaptic Terminals.metabolism.ultrastructure
Tritium.diagnostic use
Wound Healing.physiology
Appears in Collections:Journal articles

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