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Journal of Clinical Endocrinology & Metabolism, Vol 72, 727-729, Copyright © 1991 by Endocrine Society

ARTICLES

The N-terminal sequence of the major erythropoietic factor of an anephric patient is identical to insulin-like growth factor I

LF Congote, A Brox, FK Lin, HS Lu and AA Fauser
Endocrine Laboratory, Royal Victoria Hospital, Montreal, Canada.

The erythropoietic factors present in an anephric patient with nearly normal hematocrit were isolated from plasma by reversed-phase and gel permeation HPLC. The most active fraction was purified and the analysis of its N-terminal sequence was identical to the published sequence of the human insulin-like growth factor I (IGF I). Recombinant human IGF I had identical elution positions as the isolated erythropoietic factor on reversed-phase HPLC and the same molecular weight on gel permeation HPLC. Furthermore, hrIGF I stimulated erythroid colony formation in human bone marrow cultures as was previously shown for the isolated human erythropoietic factor. These results suggest that IGF I may replace erythropoietin as a stimulator of erythropoiesis in some patients with anemia and renal failure.


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