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Potential therapeutic activity of Phlogacanthus thyrsiformis Hardow (Mabb) flower extract and its biofabricated silver nanoparticles against chemically induced urolithiasis in male Wistar rats.

Urolithiasis is a painful disorder in which stones are formed in the kidney, bladder or urethra. There are no proper therapeutic treatments available for kidney stones and people suffering from larger stones have to undergo surgery which has many side effects. A natural remedy with therapeutic effects that can dissipate and remove even the larger stones would eliminate the need of a surgery and the risks associated with it. The flowers of Phlogacanthus thyrsiformis used in culinary recipes in the north eastern India are also widely used as a folklore medicine for the treatment of kidney stones and liver disorders. The aim of this study was to evaluate the prophylactic and therapeutic activity of the aqueous extract of P. thyrsiformis flowers and its biofabricated silver nanoparticles against struvite urinary stones and calcium oxalate kidney stones. A kidney stone inhibition study was carried out on struvite stones grown in gel medium and calcium oxalate stones in rat models using an aqueous extract of P. thyrsiformis flowers and its biofabricated silver nanoparticles. The aqueous extract of P. thyrsiformis flowers and their biofabricated silver nanoparticles, obtained by a green synthetic method, were used to treat struvite urinary stones in vitro and calcium oxalate kidney stones in vivo. Struvite stones were grown in tubes by gel diffusion technique and were treated with varying concentrations of the extract and its nanoparticles. The size of the struvite stones was monitored for 96h using a travelling microscope. Calcium oxalate stones were induced in male Wistar rats by feeding ethylene glycol-ammonium chloride mixture for 14days. Both, prophylactic and therapeutic activities were evaluated by analyzing the urine, serum and histopathological parameters of the rats. The qualitative screening of water extract unveiled the presence of flavonoids as a major constituent. Both, the extract and the nanoparticles effectively reduced the size of struvite stones in vitro and eliminated calcium oxalate stones in Wistar rats in vivo. The potent therapeutic activity of both extract and silver nanoparticles was observed as compared to preventive activity. Anti-urolithiatic potency can be attributed to the presence of flavonoids.

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