[Comparative study of the effect of dimephosphon monophosphonate and xydiphone biphosphonate on the histomorphometric indices of rat vertebra in a model of glucocorticosteroid osteoporosis]. / Sravnitel'noe izuchenie vliianiia monofosfonata dimefosfona i bifosfonata ksidifona na gistomorfometricheskie pokazateli stroeniia pozvonkov krys pri modelirovanii gliukokortikosteroidnogo osteoporoza.

The efficacy of monophosphonate dimephosphon and diphosphonate xydiphon was compared by experiments in rats with an osteoporosis model induced by the chronic administration of prednisolone. The glucocorticosteroid decreased the total density of trabecules (in both bone and cartilage tissues) in histological micropreparations of lumbar vertebrae and reduced the total bone cell count and the calcium content in the bone tissue. Dimephosphon, administered on the prednisolone background over the same period of time, normalized the total relative density of trabecules (by increasing the cartilage content), the total bone cell count, and the calcium content. Under the same conditions, xydiphone normalized the total relative density of trabecules (by increasing the bone content), but did not influence the prednisolone-decreased content of cartilage, total cell count, and calcium content in the vertebrae. Thus, the test results reveal a significant advantage of dimephosphon over xydiphone.

[Comparative study of dimephosphon and xidiphone efficacy in steroid-induced osteoporosis in rats]. / Sravnitel'noe izuchenie éffektivnosti dimefosfona i ksidifona pri steroidnom osteoporoze u krys.

The efficacy of dimephosphon in comparison with xydiphone was studied in rats with an osteoporosis model induced by prednisolone administration at a daily dose of 50 mg/kg over a period of 14 days. The prednisolone treatment led to an increase in the content of oxyproline (a marker of bone resorption), calcium, and inorganic phosphates in the urine. Dimephosphon (monophosphate) decreased the levels of oxyproline, calcium, and inorganic phosphate in the urine. Xydiphone (biphosphonate) equally reduced the oxyproline excretion and the calcium level in urine, while rather insignificantly affecting the phosphaturia. Dimephosphon normalized the blood calcium level, while xydiphone decreased this parameter. An additional advantage of dimephosphon over xydiphone was manifested by normalization of the body weight of test rats and the total blood protein level.