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JCS ePress
online publication date 5 Oct 2004
doi: 10.1242/jcs.01423
Research Article
4
1- and
6
1-integrins are functional receptors for midkine, a heparin-binding growth factor
Hisako Muramatsu,
Peng Zou,
Hiromichi Suzuki,
Yoshihiro Oda,
Guo-Yun Chen,
Nahoko Sakaguchi,
Sadatoshi Sakuma,
Nobuaki Maeda,
Masaharu Noda,
Yoshikazu Takada,
and
Takashi Muramatsu*
* Author for correspondence (e-mail: tmurama{at}med.nagoya-u.ac.jp)
Midkine is a heparin-binding growth factor that promotes the growth, survival, migration and differentiation of various target cells. So far, receptor-type protein tyrosine phosphatase
, low-density-lipoprotein-receptor-related protein and anaplastic lymphoma kinase have been identified as receptors for midkine. We found
1 integrin in midkine-binding proteins from 13-day-old mouse embryos.
1-Integrin bound to a midkine-agarose column and was eluted mostly with EDTA. Further study revealed that the
-subunits capable of binding to midkine were
4 and
6. Purified
4
1- and
6
1-integrins bound midkine. Anti-
4 antibody inhibited the midkine-dependent migration of osteoblastic cells, and anti-
6 antibody inhibited the midkine-dependent neurite outgrowth of embryonic neurons. After midkine treatment, tyrosine phosphorylation of paxillin, an integrin-associated molecule, was transiently increased in osteoblastic cells. Therefore, we concluded that
4
1- and
6
1-integrins are functional receptors for midkine. We observed that the low-density-lipoprotein-receptor-related-protein-6 ectodomain was immunoprecipitated with
6
1-integrin and
4
1-integrin. The low-density-lipoprotein-receptor-related-protein-6 ectodomain was also immunoprecipitated with receptor-type protein tyrosine phosphatase
.
4
1- and
6
1-Integrins are expected to co-operate with other midkine receptors, possibly in a multimolecular complex that contains other midkine receptors.

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