Anabolic steroid abuse adversely affects the endocrine system, blood lipids, and the liver, but renal injury has not been described. We identified an association of focal segmental glomerulosclerosis (FSGS) and proteinuria in a cohort of 10 bodybuilders (six white and four Hispanic; mean body mass index 34.7) after long-term abuse of anabolic steroids. The clinical presentation included proteinuria (mean 10.1 g/d; range 1.3 to 26.3 g/d) and renal insufficiency (mean serum creatinine 3.0 mg/dl; range 1.3 to 7.8 mg/dl); three (30%) patients presented with nephrotic syndrome. Renal biopsy revealed FSGS in nine patients, four of whom also had glomerulomegaly, and glomerulomegaly alone in one patient. Three biopsies revealed collapsing lesions of FSGS, four had perihilar lesions, and seven showed Ն40% tubular atrophy and interstitial fibrosis. Among eight patients with mean follow-up of 2.2 yr, one progressed to ESRD, the other seven received renin-angiotensin system blockade, and one also received corticosteroids. All seven patients discontinued anabolic steroids, leading to weight loss, stabilization or improvement in serum creatinine, and a reduction in proteinuria. One patient resumed anabolic steroid abuse and suffered relapse of proteinuria and renal insufficiency. We hypothesize that secondary FSGS results from a combination of postadaptive glomerular changes driven by increased lean body mass and potential direct nephrotoxic effects of anabolic steroids. Because of the expected rise in serum creatinine as a result of increased muscle mass in bodybuilders, this complication is likely underrecognized.
INDEX CASEThe index case (patient 1) is a 30-yr-old white male professional bodybuilder who had no significant medical history and presented to a local hospital with lower extremity edema. The patient was on no prescription medications, but as part of his bodybuilding regimen, he regularly consumed a highprotein diet (Ͼ550 g/d) and dietary supplements including 10 g/d creatine monohydrate, 1000 mg/d branched-chain amino acids, 10 g/d glutamine, and multivitamins. For more than a decade, he regularly used anabolic androgenic steroids (AASs), including injectable testosterone, methyl-1-testosterone (taken orally), growth hormone, and insulin to augment his bodybuilding. At the time of biopsy, his steroid regimen consisted of growth hormone 4 IU 5 d/wk and testosterone 500 mg intramuscularly twice weekly. In addition, he took 75 mg of ephedrine and 600 mg of caffeine before each workout session.Physical examination revealed a height of 71 inches (180 cm), a weight of 295 pounds (134 kg extremely muscular, highly toned physique (Figure 1). BP was 145/80 mmHg, and there was 2ϩ bilateral lower extremity edema. The patient was found to have a serum creatinine of 2.7 mg/dl, blood urea nitrogen of 24 mg/dl, serum albumin of 1.9 g/dl, total serum protein of 5.7 g/dl, serum cholesterol of 212 mg/dl, hematocrit of 45%, and white blood cell count of 10.3 ϫ 10 9 /L with a normal differential and platelet count of 254 ϫ...