The N-terminal sequence of the major erythropoietic factor of an anephric patient is identical to insulin-like growth factor I.
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.
Congote
L F
LF
Endocrine Laboratory, Royal Victoria Hospital, Montreal, Canada.
Brox
A
A
Lin
F K
FK
Lu
H S
HS
Fauser
A A
AA
D000595:Amino Acid Sequence; D004921:Erythropoietin / Q000737:chemistry*; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000737:chemistry*; D007668:Kidney / Q000002:abnormalities*; D007676:Kidney Failure, Chronic / Q000378:metabolism
D004921:Erythropoietin; D007334:Insulin-Like Growth Factor I