Effect of novel monoclonal antibodies on LIF-induced signaling in chicken blastodermal cells.
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.
Yamashita
Yusuke
Y
Laboratory of Immunobiology, Department of Molecular and Applied Biosciences, Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan.
Tategaki
Airo
A
Ogawa
Mari
M
Horiuchi
Hiroyuki
H
Nishida
Kensho
K
Akita
Sachiko
S
Matsuda
Haruo
H
Furusawa
Shuichi
S
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D001756:Blastoderm / Q000166:cytology / Q000378:metabolism*; D002454:Cell Differentiation; D002478:Cells, Cultured; D002642:Chick Embryo; D006224:Cricetinae; D003412:Cricetulus; D004926:Escherichia coli / Q000378:metabolism; D015850:Interleukin-6 / Q000276:immunology / Q000378:metabolism*; D053605:Leukemia Inhibitory Factor; D048369:MAP Kinase Kinase 1 / Q000378:metabolism; D048370:MAP Kinase Kinase 2 / Q000378:metabolism; D010766:Phosphorylation; D011994:Recombinant Proteins / Q000276:immunology; D050796:STAT3 Transcription Factor / Q000378:metabolism; D015398:Signal Transduction
D000911:Antibodies, Monoclonal; D015850:Interleukin-6; D053605:Leukemia Inhibitory Factor; C507838:Lif protein, mouse; D011994:Recombinant Proteins; D050796:STAT3 Transcription Factor; D048369:MAP Kinase Kinase 1; D048370:MAP Kinase Kinase 2