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Identification of Retinol-binding Protein Produced by Caprine Endometrium during Periattachment Period of Early Pregnancy
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 Title & Authors
Identification of Retinol-binding Protein Produced by Caprine Endometrium during Periattachment Period of Early Pregnancy
Liu, K.H.; Huang, J.C.; Lin, J.H.;
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 Abstract
Endometrial explants obtained from does between days 13 and 21 of pregnancy were cultured in a modified minimum essential medium in the presence of []methionine and []-leucine. Proteins synthesized and secreted into medium were analyzed by fluorography of two-dimensional polyacrylamide gel electrophoresis and fluorography. No marked qualitative changes in patterns of protein production by caprine endometrium between days 13-21 of pregnancy. At least 11 proteins showed consistently a clear spot or a grouping of spots with characteristic location on two-dimensional gels. A major low molecular weight protein consisted of two major isoforms (pI 5.3-6.0) of similar molecular mass (21 kDa). Limited N-terminal sequence analysis of these two isoforms showed that the protein had complete homology with bovine placental and plasma retinol-binding protein (RBP) over the first 20 amino acids. Through use of the antiserum raised against bovine placental RBP, immunoreactive RBP was detected in cultures conditioned by uterine explants prepared at days 13, 15 and 21 of pregnancy. In the present study, proteins synthesized and secreted by caprine endometrium during periattachment period of early pregnancy were characterized. The pregnant endometrium secreted a number of neutral-to-acidic proteins which constituted, in part, the histotroph. A vitamin A-transport protein, RBP, was identified in cultures conditioned by endometrium of days 13-21 of pregnancy. The uterine endometrium is the only source of retinol for embryonic tissues. The uterine RBP appears to transport retinol locally toward embryonic tissues. Secretion of RBP by caprine endometrium of days 13, 15 and 21 of pregnancy suggested that retinol played an important role in conceptus development during periattachment period of early pregnancy.
 Keywords
Goat;Uterus;Vitamin A;
 Language
English
 Cited by
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