BETULIN DERIVATIVES. BIOLOGICAL ACTIVITY AND SOLUBILITY IMPROVEMENT
UDC 615.322
Abstract
In the review the biological properties (antitumor, antiviral, hypolipidemic, anti-inflammatory, etc.) and bioavailability of betulin and betulinic acid derivatives were discussed. These compounds are isolated from various natural sources, including birch bark (Betula, Betulaceae). The structure-activity correlation was considered for well-known betulinic acid derivatives. The perspectivity of this compounds as active pharmaceutical ingredients was demonstrated by in vitro, in vivo, and ex vivo experiments. The type of antitumor actions, generally, depends on substituents at the C-3 and C-28 carbon atoms of the lupane skeleton. It is very important that the carboxyl group of betulinic acid in the C-28 position was present. In this case, the cytotoxicity of C-3 modified derivatives is extremely high for all tested cell lines.
The use of these compounds in the medical practice is complicated because they have low bioavailability and poor water solubility (from 1 to 100 µg*l-1). The main chemical syntheses for solubility improvement of betulin derivatives by grafting of hydrophilic groups were discussed. Moreover, the colloid-chemical approaches for the bioavailability improving of triterpenoids include: 1) including of these compounds in liposomes, vesicles and other nanoparticles; 2) obtaining of micelles with high-molecular compounds; 3) colloid-chemical dissolution due to physico-mechanical action; 4) inclusion complexes formation; 5) using of polymers for triterpenoids grafting. Chemical modification of betulin and betulinic acid by polar groups, such as phosphate/phosphonate, sulfate, amino acids, etc. has been shown for bioavailability improving.
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