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Regeneration‐associated high level expression of apolipoprotein D mRNA in endoneurial fibroblasts of peripheral nerve.
Author(s) -
Spreyer P.,
Schaal H.,
Kuhn G.,
Rothe T.,
Unterbeck A.,
Olek K.,
Müller H. W.
Publication year - 1990
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1990.tb07426.x
Subject(s) - neurology , regeneration (biology) , neuroscience , biology , library science , computer science , microbiology and biotechnology
A cDNA clone containing the entire coding region of rat apolipoprotein D (Apo D) was isolated from a cDNA library of regenerating sciatic nerve by differential hybridization. Only small amounts of Apo D mRNA were detected in noninjured mature nerve. Moderately increased levels of Apo D transcripts were found in transected nerves, which were prevented from regeneration by ligation. In contrast, in regenerating crushed nerve, the steady‐state level of Apo D mRNA transiently increased at least 40‐fold above control levels at the time when axons from the proximal stump grow into the distal nerve segment. Using transverse sections and primary cell cultures from regenerating nerve, Apo D transcripts could be localized by in situ hybridization in endoneurial fibroblasts but not in Schwann cells, macrophages or perineurial and epineurial cells. Apo D protein (Mr 32.8 kd) was secreted and accumulated in the endoneurial extracellular space where it could be detected in lipoprotein fractions by immunoblotting using established antibodies to human Apo D. High level expression of Apo D mRNA seems to be a novel regeneration‐associated molecular event of endoneurial fibroblasts indicating a function for Apo D and fibroblasts in nerve repair.