Sl. Timofeevski et al., ANTIINFLAMMATORY AND ANTISHOCK WATER-SOLUBLE POLYESTERS OF GLUCOCORTICOIDS WITH LOW-LEVEL SYSTEMIC TOXICITY, Pharmaceutical research, 13(3), 1996, pp. 476-480
Purpose. The objective of this study was to evaluate the pharmacologic
al activity of glucocorticoid hormones incorporated into the structure
of water-soluble carbochain polymers via the esterified 21-CH2OH grou
p. Methods. Polymer analogs of glucocorticoids were prepared by radica
l copolymerization of 1-vinyl-2-pyrrolidone with cortisol or dexametha
sone 21-crotonates and crotonic acid or 2-(diethylamino) ethylcrotonat
e which served as ionogenic comonomers. Anti-inflammatory, immunosuppr
essive and catabolic activities for ionogenic tertiary copolymers and
previously prepared non-ionogenic binary copolymers were evaluated in
standard animal models. The antishock activity of some of the copolyme
rs was evaluated using the ''declamping shock'' model. Results. Water-
soluble tertiary copolymers with a steroid content up to 14 mol% and a
n intrinsic viscosity up to 0.30 dl/g in ethanol were synthesized. It
was shown that the copolymers were stable in aqueous solutions at pH 5
.2-7.3. All of the polymers studied suppressed inflammatory reactions
at the level of free hormones when administered interperitoneally. The
antishock activity was considerably higher compared to free steroids.
The copolymers, unlike unmodified glucocorticoids, did not influence
the physical development of young animals. They also caused much lower
thymus hypotrophy than free hormones. No clear effect of the presence
and nature of ionogenic units in copolymers on the pharmacological pe
rformance of the copolymers was detected. Conclusions. The water-solub
le polymers bearing glucocorticoid 21-residues in the side chains reta
in the anti-inflammatory activity of free steroids and exhibit a highe
r antishock, a lower immunosuppressive and no catabolic effect.