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A high phosphotyrosine phosphatase activity is present in differentiating bovine lens cells
Author(s) -
Blanquet Pierre R.,
Croquet Frederic
Publication year - 1995
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1006/cbir.1995.1052
Subject(s) - phosphatase , protein tyrosine phosphatase , biology , receptor , biochemistry , lens (geology) , enzyme , alkaline phosphatase , microbiology and biotechnology , cellular differentiation , gene , paleontology
Activity of phosphotyrosine ‐ protein phosphatases (PTPases) has been investigated in the different cellular regions of bovine eye lens. PTPases were tested in cellular detergent extracts using phospholabelled synthetic peptides and p‐nitrophenyl phosphate. We show that a high PTPase activity is only present in cells which undergo differentiation, namely the equatorial epithelium and cortex fiber cells. Since this activity is found to be severely inhibited by a specific inhibitor of receptor ‐ type PTPases, it can be suggested that one or more members of this class of PTPases might play an important role in the lens differentiation process.