The fate of [14C]-mesna in the rat.
[14C]-Mesna (sodium 2-mercaptoethanesulphonate) has a short serum t1/2 (about 16.5 min) and is excreted in the urine. Within 24 h approx. 77% of the administered dose appeared in the urine. It is bound to serum albumin and immunoglobulins. Total serum protein binding is about 9.7% of the total amount present in serum. [14C]-mesna + [14C]-dimesna (bis[2-mercaptoethane sulphonate]) are present in the blood stream, and so are found in the body organs at low concentration, however, localisation of radioactivity occurs in the kidneys. The binding of [14C]-mesna to proteins and the localisation of [14C]-mesna or [14C]-dimesna in the kidneys are discussed in the context of the cell killing efficacy of the oxazaphosphorines.
D000818:Animals; D002250:Carbon Radioisotopes; D007136:Immunoglobulins / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D008297:Male; D008623:Mercaptoethanol / Q000031:analogs & derivatives*; D015080:Mesna / Q000031:analogs & derivatives / Q000032:analysis / Q000097:blood / Q000378:metabolism* / Q000652:urine; D051381:Rats; D011919:Rats, Inbred Strains; D012709:Serum Albumin / Q000378:metabolism; D014018:Tissue Distribution
D002250:Carbon Radioisotopes; D007136:Immunoglobulins; D012709:Serum Albumin; D008623:Mercaptoethanol; C027032:2,2'-dithiodiethanesulfonic acid; D015080:Mesna