Effects of Graded Doses of Testosterone on Erythropoiesis in Healthy Young and Older Men

Author:

Coviello Andrea D.1,Kaplan Beth1,Lakshman Kishore M.1,Chen Tai1,Singh Atam B.2,Bhasin Shalender1

Affiliation:

1. Section of Endocrinology, Diabetes, and Nutrition (A.D.C., B.K., K.M.L., T.C., S.B.), Boston University School of Medicine, Boston, Massachusetts 02118

2. Charles R. Drew University (A.B.S.), Los Angeles, California 90059

Abstract

Abstract Context: Erythrocytosis is a dose-limiting adverse effect of testosterone therapy, especially in older men. Objective: Our objective was to compare the dose-related changes in hemoglobin and hematocrit in young and older men and determine whether age-related differences in erythropoietic response to testosterone can be explained by changes in erythropoietin and soluble transferrin receptor (sTfR) levels. Design: We conducted a secondary analysis of data from a testosterone dose-response study in young and older men who received long-acting GnRH agonist monthly plus one of five weekly doses of testosterone enanthate (25, 50, 125, 300, or 600 mg im) for 20 wk. Setting: The study took place at a General Clinical Research Center. Participants: Participants included 60 older men aged 60–75 yr and 61 young men aged 19–35 yr. Outcome Measures: Outcome measures included hematocrit and hemoglobin and serum erythropoietin and sTfR levels. Results: Hemoglobin and hematocrit increased significantly in a linear, dose-dependent fashion in both young and older men in response to graded doses of testosterone (P < 0.0001). The increases in hemoglobin and hematocrit were significantly greater in older than young men. There was no significant difference in percent change from baseline in erythropoietin or sTfR levels across groups in either young or older men. Changes in erythropoietin or sTfR levels were not significantly correlated with changes in total or free testosterone levels. Conclusions: Testosterone has a dose-dependent stimulatory effect on erythropoiesis in men that is more pronounced in older men. The testosterone-induced rise in hemoglobin and hematocrit and age-related differences in response to testosterone therapy may be mediated by factors other than erythropoietin and sTfR.

Publisher

The Endocrine Society

Subject

Biochemistry, medical,Clinical Biochemistry,Endocrinology,Biochemistry,Endocrinology, Diabetes and Metabolism

Reference34 articles.

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3. Effects of various modes of androgen substitution therapy on erythropoiesis.;Jockenhovel;Eur J Med Res,1997

4. Risks versus benefits of testosterone therapy in elderly men.;Basaria;Drugs Aging,1999

5. Erythropoietic mechanisms of androgens: a critical review and clinical implications.;Molinari;Haematologica,1982

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