Radioprotection by WR-2721 against Long-Term Chronic Damage to the Rat Parotid Gland

Abstract
WR-2721 [S-2-(3-aminopropylamino)ethylphosphorothioic acid] protected against the acute phase of radiation damage which is manifest during the 1st wk after irradiation, though recovery occurred both in the presence and absence of such protection. The drug also protected against the chronic phase damage which appeared later (60-90 days postirradiation), with dose modification factors of 2.3 for gland weight, 3.2 for amylase and 2.0 for total gland amylase and R increases ranging from 1.7-4.9 kR.