CHARACTERIZATION OF PHYSICAL ENTRAPMENT AND CHEMICAL CONJUGATION OF ADRIAMYCIN IN POLYMERIC MICELLES AND THEIR DESIGN FOR IN-VIVO DELIVERY TO A SOLID TUMOR
M. Yokoyama et al., CHARACTERIZATION OF PHYSICAL ENTRAPMENT AND CHEMICAL CONJUGATION OF ADRIAMYCIN IN POLYMERIC MICELLES AND THEIR DESIGN FOR IN-VIVO DELIVERY TO A SOLID TUMOR, Journal of controlled release, 50(1-3), 1998, pp. 79-92
An anticancer drug adriamycin (ADR) was incorporated into polymeric mi
celles forming from poly(ethylene glycol)poly(aspartic acid) block cop
olymer by chemical conjugation and physical entrapment. Structural sta
bility of the polymeric micelles was found to be dependent on both the
contents of chemically conjugated and physically entrapped ADR. The p
olymeric micelle with high contents of the chemically conjugated ADR a
nd the physically entrapped ADR expressed very high in vivo antitumor
activity against murine C 26 tumor, while the polymeric micelle with o
nly the chemically conjugated ADR showed negligible in vivo activity.
This indicates that the physically entrapped ADR played a major role i
n antitumor activity in vivo. For the polymeric micelle with the high
ADR contents, it was found that a dimer of adriamycin molecules formed
and that this dimer was physically entrapped in the inner core of the
micelle as well as intact ADR. (C) 1998 Elsevier Science B.V.