Abstract:
:The basement membrane (BM) protein laminin-332 (Lm332) (laminin-5) has unique activity and structure as compared with other laminins: it strongly promotes cellular adhesion and migration, and its alpha3, beta3, and gamma2 chains are all truncated in their N-terminal regions (short arms). In the present study, we investigated the biological function of the laminin beta3 chain. When the beta3 chain short arm (beta3SA) was overexpressed in HEK293 cells (beta3SA-HEK), they deposited a large amount of beta3SA and a small amount of laminin-511 (Lm511) (laminin-10) on culture plates. Control HEK293 cells secreted Lm511 but failed to deposit it. The extracellular matrix (ECM) deposited by beta3SA-HEK cells strongly promoted cell attachment and spreading. The beta3SA-HEK ECM did not directly bind Lm511, but it stimulated control HEK293 cells to deposit Lm511 on the culture plates. Although purified beta3SA did not support cell adhesion by itself, it enhanced the cell adhesion activity of Lm511. Experiments with anti-integrin antibodies also suggested that the strong cell adhesion activity of the beta3SA-HEK ECM was derived from the synergistic action of beta3SA and Lm511. It has previously been found that beta3SA binds an unknown cell surface receptor. Taken together, the present study suggests that the short arm of the laminin beta3 chain enhances the matrix assembly of Lm511 and its cell adhesion activity by interacting with its receptor.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Nakashima Y,Kariya Y,Miyazaki Kdoi
10.1002/jcb.21032subject
Has Abstractpub_date
2007-02-15 00:00:00pages
545-56issue
3eissn
0730-2312issn
1097-4644journal_volume
100pub_type
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