Boes M, Dake BL, Booth BA, Sandra A, Bateman M, Knudtson KL, Bar RS. IGF-I and IGFBP-3 transport in the rat heart.
Am J Physiol Endocrinol Metab 2003;
284:E237-9. [PMID:
12485812 DOI:
10.1152/ajpendo.00336.2002]
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Abstract
Specific binding of IGF-binding protein (IGFBP)-3 was shown to be present in the isolated, beating rat heart. The uptake of perfused (125)I-labeled IGF-I in the beating heart was decreased to 9% by blocking IGF-I binding sites with the IGF-I analog Long R(3) (LR(3)) IGF-I. When LR(3) was perfused with complexes of (125)I-IGF-I. IGFBP-3, uptake of (125)I-IGF-I was decreased to 41%, which was significantly greater than LR(3) and (125)I-IGF-I (41 vs. 9%). These data suggest that both microvessel IGF-I and IGFBP-3 binding sites contribute to the transport of IGF-I in the perfused rat heart. This also suggests a novel and plausible mechanism whereby circulating IGFs reach sites of IGF bioactivity.
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