Conjugation of Arg-Gly-Asp (RGD) Sequence in Copolymer Bearing Sugar Moiety for Insulinoma Cell Line (MIN6) Culture.

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Copolymers composed of an Arg-Gly-Asp (RGD) sequence for the adhesion molecule and sugar moieties were synthesized for an insulinoma cell (MIN6) culture. MIN6 cells attached on the poly(N-p-vinylbenzyl-D-maltonamide-co-6-(p-vinylbenzamido)-hexanoic acid-g-GRGDS) (p(VMA-co-VBGRGDS))-coated dishes were in a more aggregated form than other polymer-coated surfaces. P(VMA-co-VBGRGDS) also shows faster proliferation of MIN6 cells (about 18% higher) than with p(VLA-co-VBGRGDS). By interaction between cell and matrix, about 80% greater insulin secretion from MIN6 cells was produced with the p(VMA-co-VBGRGDS), and about 50% greater insulin secretion was produced with the poly(N-p-vinylbenzyl-D-lactonamide-co-6-(p-vinylbenzamido)-hexanoic acid-g-GRGDS) (p(VLA-co-VBGRGDS) as compared with unstimulated cells. Moreover, attachment of MIN6 cells treated with RGD monomer was suppressed approximately 50% for the p(VMA-co-VBGRGDS) surface. This result supported the idea that conjugation of adhesion molecules of RGD peptide in p(VMA-co-VBGRGDS) copolymer specifically interact with integrin families on MIN6 cell membrane.

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