The main features of CH50, a recombinant polypeptide of human fibronectin, activating macrophages in vivo and its anti tumor function were investigated. After injection of CH50 and(or) trans...The main features of CH50, a recombinant polypeptide of human fibronectin, activating macrophages in vivo and its anti tumor function were investigated. After injection of CH50 and(or) transfection of IFN γ gene in vivo , several kinds of factors produced by macrophages were determined and the growth of tumor in vivo was measured. CH50 could enhance the production of such factors as NO, TNF and IL 1 by macrophages, but the activation of macrophages was relatively slow when CH50 was used in vivo alone. CH50 and IFN γ could synergistically activate macrophages rapidly in vivo no matter whether the injection of CH50 or the transfection of IFN γ gene was performed first. Injection of CH50 alone inhibited the formation of tumor nodes in a dose dependent manner. Low dose of CH50 could strongly inhibit the formation of tumor nodes less than 1 mm, while high dose of CH50 could inhibit those more than 1 mm. A stronger inhibition on the growth of tumor in vivo was obtained by the synergistic effect of CH50 and IFN γ. CH50 and IFN γ, as double signal factors for activation of macrophages, will be potentially useful in tumortherapy.展开更多
基金This project was supported by a grant from the National Natural Sciences Foundation of China(No.39870 76 3) and a grantfrom
文摘The main features of CH50, a recombinant polypeptide of human fibronectin, activating macrophages in vivo and its anti tumor function were investigated. After injection of CH50 and(or) transfection of IFN γ gene in vivo , several kinds of factors produced by macrophages were determined and the growth of tumor in vivo was measured. CH50 could enhance the production of such factors as NO, TNF and IL 1 by macrophages, but the activation of macrophages was relatively slow when CH50 was used in vivo alone. CH50 and IFN γ could synergistically activate macrophages rapidly in vivo no matter whether the injection of CH50 or the transfection of IFN γ gene was performed first. Injection of CH50 alone inhibited the formation of tumor nodes in a dose dependent manner. Low dose of CH50 could strongly inhibit the formation of tumor nodes less than 1 mm, while high dose of CH50 could inhibit those more than 1 mm. A stronger inhibition on the growth of tumor in vivo was obtained by the synergistic effect of CH50 and IFN γ. CH50 and IFN γ, as double signal factors for activation of macrophages, will be potentially useful in tumortherapy.
