Wortmannin Blocks Goldfish Retinal Phosphatidylinositol 3-Kinase and Neurite Outgrowth

Content Provider	Semantic Scholar
Author	Lavie, Yaakov Dybowski, Joseph Arthur Agranoff, Bernard W.
Copyright Year	2004
Abstract	The goldfish retina has been used extensively for the study of nerve regeneration. A role for phosphatidylinositol 3-kinase (PI3K) in neurite outgrowth from goldfish retinal explants has been examined by means of wortmannin (WT), a selective inhibitor of the enzyme. The presence of PI3K in retinal extracts was determined by means of immunoprecipitation as well as by an in vitro assay system for catalytic activity. The relative amount of the p85 subunit of PI3K detected by western blot in the retina following optic nerve crush was unchanged. WT inhibited goldfish brain PI3K activity at concentrations as low as 10−9 M, approximating that reported for inhibition of mammalian PI3K's. Daily addition of 10−8 M WT to retinal explants, activated by prior crush of the optic nerve, significantly inhibited neurite outgrowth during a 7 day in vitro culture period, while a single addition of WT to freshly explanted retina had no effect on neurite outgrowth. These results suggest that a PI3K-mediated process may be critical for nerve regrowth.
Starting Page	373
Ending Page	378
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1023/A:1027391206791
PubMed reference number	9130246
Journal	Medline
Volume Number	22
Alternate Webpage(s)	https://deepblue.lib.umich.edu/bitstream/handle/2027.42/45415/11064_2004?sequence=1
Alternate Webpage(s)	https://deepblue.lib.umich.edu/bitstream/handle/2027.42/45415/11064_2004_Article_421925.pdf?isAllowed=y&sequence=1
Alternate Webpage(s)	https://deepblue.lib.umich.edu/bitstream/handle/2027.42/45415/11064_2004_Article_421925.pdf?sequence=1
Alternate Webpage(s)	https://doi.org/10.1023/A%3A1027391206791
Journal	Neurochemical Research
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article