Differentiation in Acanthamoeba castellanii is induced by specific monoclonal antibodies.

Abstract:

:Monoclonal antibodies that bind a large molecular weight plasma membrane protein of Acanthamoeba castellanii cause the cells to differentiate. A different monoclonal antibody that binds specifically to the major plasma membrane protein has no effect upon cell division or differentiation. The induction of differentiation by the monoclonal antibodies requires a bivalent attachment, more than a single binding cycle of the antibody to the plasma membrane protein, does not require cell-cell contact, and appears to be mediated by an inhibition of pinocytosis. These results suggest one of two alternatives: either this free living amoeba possesses a cell surface receptor that serves to initiate the differentiation process when stimulated, or the specific plasma membrane antigen for the differentiation-inducing monoclonal antibodies is an essential component of the pinocytotic mechanism. While it seems more likely on the basis of available evidence that we are observing the biological effects of a cell surface receptor, either of the two alternative circumstances open up investigative areas of large significance.

journal_name

J Cell Biochem

authors

Villemez CL,Carlo PL,Russell MA

doi

10.1002/jcb.240290410

subject

Has Abstract

pub_date

1985-01-01 00:00:00

pages

373-9

issue

4

eissn

0730-2312

issn

1097-4644

journal_volume

29

pub_type

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