Mild impairment of motor nerve repair in mice lacking PTP-BL tyrosine phosphatase activity.
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SourcePhysiological Genomics, 19, 1, (2004), pp. 50-60
Article / Letter to editor
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Cell Biology (UMC)
SubjectUMCN 1.4: Immunotherapy, gene therapy and transplantation; UMCN 5.3: Cellular energy metabolism
Mouse PTP-BL is a large, nontransmembrane protein tyrosine phosphatase of unclear physiological function that consists of a KIND domain, a FERM domain, five PDZ domains, and a COOH-terminal catalytic PTP domain. PTP-BL and its human ortholog PTP-BAS have been proposed to play a role in the regulation of microfilament dynamics, cytokinesis, apoptosis, and neurite outgrowth. To investigate the biological function of PTP-BL enzyme activity, we have generated mice that lack the PTP-BL PTP moiety. These PTP-BL(DeltaP/DeltaP) mice are viable and fertile and do not present overt morphological alterations. Although PTP-BL is expressed in most hematopoietic cell lineages, no alterations of thymocyte development in PTP-BL(DeltaP/DeltaP) mice could be detected. Sciatic nerve lesioning revealed that sensory nerve recovery is unaltered in these mice. In contrast, a very mild but significant impairment of motor nerve repair was observed. Our findings exclude an essential role for PTP-BL as a phosphotyrosine phosphatase and rather are in line with a role as scaffolding or anchoring molecule.
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