Opposing roles of integrin alpha6Abeta1 and dystroglycan in laminin-mediated extracellular signal-regulated kinase activation

Ferletta, MariaLund University,Lunds universitet,Uppsala universitet,Institutionen för cell- och molekylärbiologi,Institutionen för experimentell medicinsk vetenskap,Medicinska fakulteten,Department of Experimental Medical Science,Faculty of Medicine (author)

Laminin-integrin interactions can in some settings activate the extracellular signal-regulated kinases (ERKs) but the control mechanisms are poorly understood. Herein, we studied ERK activation in response to two laminins isoforms (-1 and -10/11) in two epithelial cell lines. Both cell lines expressed beta1-containing integrins and dystroglycan but lacked integrin alpha6beta4. Antibody perturbation assays showed that both cell lines bound to laminin-10/11 via the alpha3beta1and alpha6beta1 integrins. Although laminin-10/11 was a stronger adhesion complex than laminin-1 for both cell lines, both laminins activated ERK in only one of the two cell lines. The ERK activation was mediated by integrin alpha6beta1 and not by alpha3beta1 or dystroglycan. Instead, we found that dystroglycan-binding domains of both laminin-1 and -10/11 suppressed integrin alpha6beta1-mediated ERK activation. Moreover, the responding cell line expressed the two integrin alpha6 splice variants, alpha6A and alpha6B, whereas the nonresponding cell line expressed only alpha6B. Furthermore, ERK activation was seen in cells transfected with the integrin alpha6A subunit, but not in alpha6B-transfected cells. We conclude that laminin-1 and -10/11 share the ability to induce ERK activation, that this is regulated by integrin alpha6Abeta1, and suggest a novel role for dystroglycan-binding laminin domains as suppressors of this activation.

Kikkawa, YamatoUppsala universitet,Institutionen för cell- och molekylärbiologi (author)
Yu, HaoLund University,Lunds universitet,Klinisk minnesforskning,Forskargrupper vid Lunds universitet,Clinical Memory Research,Lund University Research Groups(Swepub:lu)medk-hyo (author)
Talts, JanLund University,Lunds universitet,Institutionen för experimentell medicinsk vetenskap,Medicinska fakulteten,Department of Experimental Medical Science,Faculty of Medicine(Swepub:lu)medk-jta (author)
Durbeej, Madeleine (author)
Sonnenberg, Arnoud (author)
Timpl, Rupert (author)
Campbell, Kevin P (author)
Ekblom, PeterLund University,Lunds universitet,Uppsala universitet,Institutionen för cell- och molekylärbiologi,Institutionen för experimentell medicinsk vetenskap,Medicinska fakulteten,Department of Experimental Medical Science,Faculty of Medicine(Swepub:lu)medk-pek (author)
Genersch, ElkeUppsala universitet,Institutionen för cell- och molekylärbiologi (author)
Uppsala universitetInstitutionen för cell- och molekylärbiologi (creator_code:org_t)

By the author/editor: Ferletta, Maria; Kikkawa, Yamato; Yu, Hao; Talts, Jan; Durbeej, Madelei ...; Sonnenberg, Arno ...; show more...; Timpl, Rupert; Campbell, Kevin ...; Ekblom, Peter; Genersch, Elke; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Biochemistry and ...

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