Overexpression of claudin-5 but not claudin-3 induces formation of trans-interaction-dependent multilamellar bodies.

Abstract:

:Tight junctions (TJs) regulate paracellular barriers and claudins (Cld) form the backbone of TJ strands. To elucidate the molecular mechanism of claudin polymer formation, TJs were reconstituted by claudin transfection of TJ-free HEK293 cells. Therewith, typical TJ stands can be found at cell-cell contacts. In addition, overexpression of Cld5-YFP induces formation of huge intracellular multilamellar bodies. In contrast, Cld3 does not induce similar structures. Inhibition of trans-interaction of Cld5 by Y148A substitution diminished formation of multilamellar bodies. These results demonstrate claudin subtype-specific oligomerization. Cld3 and Cld5 localize to the plasma membrane differentially. Phosphorylation at T207 of Cld5 was suggested to participate in regulation of Cld5 internalization. However, prevention of potential phosphorylation by T207A substitution did not increase Cld5 amount in the plasma membrane of transfected cells. Taken together, if carefully evaluated, transfection of claudin constructs in nonpolar cells is a powerful strategy to improve understanding of subcellular targeting and assembly of TJ proteins.

journal_name

Ann N Y Acad Sci

authors

Rossa J,Lorenz D,Ringling M,Veshnyakova A,Piontek J

doi

10.1111/j.1749-6632.2012.06546.x

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

59-66

eissn

0077-8923

issn

1749-6632

journal_volume

1257

pub_type

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