Effect of novel monoclonal antibodies on LIF-induced signaling in chicken blastodermal cells

Yamashita Yusuke

Tategaki Airo

Ogawa Mari

Horiuchi Hiroyuki

Nishida Kensho

Akita Sachiko

Matsuda Haruo

Furusawa Shuichi

Developmental and Comparative Immunology

Leukemia-inhibitory factor (LIF) is indispensable for maintaining the undifferentiated state when propagating mouse embryonic stem (ES) cells. We previously cloned chicken LIF (chLIF) cDNA and demonstrated that it maintained chicken ES cell cultures in an undifferentiated state. Here, we developed two monoclonal antibodies, HUL-1 and HUL-2, against chLIF, which specifically recognized recombinant chLIF (rchLIF) produced by Escherichia coli and Chinese hamster ovary K1 cells, in enzyme-linked immunosorbent assays and Western blot analysis. In addition, HUL-2 inhibited the phosphorylation of signal transducer and activator of transcription 3 by rchLIF in chicken blastodermal cells (CBCs), but not that of mitogen-activated protein kinase kinase. Furthermore, the addition of HUL-2 to CBC cultures resulted in embryoid bodies forming earlier than in normal cultures. These results indicated that HUL-2 recognized not only rchLIF but also native chLIF, and suggested that CBCs in culture produce LIF, which functions in autocrine signaling.

chicken

chicken blastodermal cells

cytokine

ES cells

LIF

mAb

MEK1/2

STAT3

Biology [ 460 ]

eng

Elsevier

Copyright (c) 2006 Elsevier Ltd.

[ISSN] 0145-305X

[DOI] 10.1016/j.dci.2005.07.003

[NCID] AA00627870

[PMID] 16150488

[DOI] http://dx.doi.org/10.1016/j.dci.2005.07.003 isVersionOf