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Original

AMF/G6PI induces differentiation of leukemic cells via an unknown receptor that differs from gp78

, PhD, , , , , , & show all
Pages 2234-2243 | Received 17 Feb 2006, Accepted 22 Apr 2006, Published online: 01 Jul 2009
 

Abstract

Autocrine Motility Factor (AMF)/maturation factor (MF)/neuroleukin (NLK) is a multifunctional protein, which acts as a glucose 6-phosphate isomerase (G6PI) intracellularly. Exto-G6PI stimulates invasion and metastasis of tumor cells, neurotropic growth and differentiation of leukemic cells. The cell motility and proliferation receptor is known to be gp78 (78 kilo-Dalton glycoprotein), which has seven transmembrane domains in its N-terminal region, but the maturation factor receptor remains unclear. The human acute monocytic leukemia line does not express gp78 and its motile activity is not enhanced by AMF though it is well differentiated by AMF exposure. The forced expression of gp78 in leukemic cells recovered acceptable motile stimulation, concomitant with reduced differentiation ability. Two unknown proteins were detected by crosslinking between AMF and leukemic cells. The results of this report suggest that the receptor molecule for AMF/NLK/MF in leukemic differentiation is not gp78.

Abbreviations
AMF=

autocrine motility factor

G-418=

geneticin

gp78=

78 kilo-Dalton glycoprotein

HRP=

horseradish peroxidase

NLK=

neuroleukin

G6PI=

glucose 6-phosphate isomerase

MF=

maturation factor

Abbreviations
AMF=

autocrine motility factor

G-418=

geneticin

gp78=

78 kilo-Dalton glycoprotein

HRP=

horseradish peroxidase

NLK=

neuroleukin

G6PI=

glucose 6-phosphate isomerase

MF=

maturation factor

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