title: Vitamin D binding protein sequesters monomeric actin in the circulation of the rat.
abstract: Plasma vitamin D binding protein (DBP) may scavenge actin released during cell lysis. We examined the plasma disappearance and tissue appearance of 125I-DBP, 125I-G-actin, and the DBP-G-actin complex after their intravenous administration to rats. The plasma disappearance of DBP and DBP-actin were indistinguishable, with rapid initial (t1/2 = 2.6 h) and slower second (t1/2 = 7 h) slopes. After 125I-G-actin (nanomole) injection, plasma disappearance paralleled that of DBP and DBP-actin. All injected actin was associated with DBP, without evidence of free actin, actin-gelsolin complexes or actin oligomers. Tissue appearances of 125I-apo-DBP (apo) or holo-DBP were similar, with highest accumulations in perfused liver, kidney, and skeletal muscle. Although more complex phenomena (plasma entry of F-actin and intracellular actin binding proteins) would occur in vivo after cell lysis, our results suggest a role for DBP in the sequestration and disposition of actin monomers in the circulation.
mesh_terms: D000199:Actins / Q000097:blood*; D000818:Animals; D001059:Apoproteins / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D008840:Microfilament Proteins / Q000378:metabolism; D009132:Muscles / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D012709:Serum Albumin / Q000378:metabolism; D014018:Tissue Distribution; D014809:Vitamin D-Binding Protein / Q000097:blood*
chemical_list: D000199:Actins; D001059:Apoproteins; D008840:Microfilament Proteins; D012709:Serum Albumin; D014809:Vitamin D-Binding Protein