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• W2149163982 abstract "Previous studies from our laboratories demonstrated that a peptide from the noncollagenous domain of the α3 chain of basement membrane collagen (COL IV), comprising residues 185-203, inhibits polymorphonuclear leukocyte activation and melanoma cell proliferation; this property requires the presence of the triplet -SNS- in residues 189-191 (Monboisse et al., J. Biol. Chem., 269, 25475, 1994; Han et al., J. Biol. Chem., 272, 20395, 1997). In the present study, we demonstrate that whole native COL IV and -SNS- containing synthetic peptides (10 µg/ml) added to culture medium inhibit the proliferation of not only melanoma cells, but also breast-, pancreas- and stomach-tumor cells up to 67%, and prostate tumor cells by 15%. ALC-COL IV at 5 µgg/ml was shown to inhibit melanoma cell proliferation maximally at 69% and the α3(IV)185-203 peptide inhibited proliferation (62%) maximally at 10µg/ml. Treatment of the α3(IV)185-203 peptide with either a specific mAb or a polyclonal antibody, prepared against the sequence α3(IV)179-208, decreased the ability of the peptide to inhibit cell proliferation by 97%, while treatment of ALC-COL IV with the same antibodies inhibited proliferation by 44%.Exposure of the above tumor cells to COL IV or the peptides resulted in an increase of intracellular cAMP that was inhibited by prior treatment of the protein with the above antibodies. To investigate the role of cAMP in the inhibition of cell proliferation, cAMP analogs and inhibitors were used. cAMP analogs mimicked the inhibitory effect of the peptide. Rp-cAMPS, a cAMP competitive inhibitor, suppressed the inhibitory effect of ALC-COL IV and of the cAMP analogs. The protein kinase-A inhibitor H-89 blocked the ability of ALC-COL IV and of the α3(IV)185-203 peptide to inhibit tumor cell proliferation. These data suggest that ALC-COL IV, through its α3(IV) chain, inhibits tumor cell proliferation utilizing a signal transduction pathway which includes cAMP and cAMP-dependent protein kinase(s)." @default.
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• W2149163982 date "1999-01-01" @default.
• W2149163982 modified "2023-10-18" @default.
• W2149163982 title "Inhibition of Tumor Cell Proliferation by Type IV Collagen Requires Increased levels of cAMP" @default.
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• W2149163982 doi "https://doi.org/10.3109/03008209909005285" @default.
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