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Carrie H. Nelson Kimberly Kline John R. Ellison Bob G. Sanders 《Differentiation; research in biological diversity》1984,26(1-3):36-41
Abstract. Immune cytolysis and immunofluorescence were used to examine chicken fetal antigen CFA) and chicken adult antigen (CAA) expression on the differentiation/maturation series of definitive erythroid cells obtained from the bone marrow of different aged chickens. We found that erythroid cells undergo changes in CFA/CAA antigenic expression dependent on their differentiation/maturation stage as well as the developmental age of the chicken. All differentiation/maturation stages of erythroid cells in the bone marrow of 12 and 18-day-old embryos express CFA only. Erythroblasts obtained from 7-day post-hatched chickens express either CFA or CAA. All three CFA/CAA phenotypes (i.e., CFA, CAA, and CFA + CAA) are observed in subsequent maturation stages, but only the CFA + CAA phenotype is observed in mature erythroid cells in the bone marrow of 7day post-hatched chickens. Erythroblasts from 62 day post-hatched chickens exhibit all three CFA/CAA phenotypes. Cells in the subsequent maturation stages express various CFA, CAA, or CFA + CAA phenotypes resulting in a majority of the mature erythrocytes expressing both CFA and CAA, and a small population of mature erythrocytes expressing CAA only. Erythroblasts from adult chickens express both CFA and CAA; however, CFA is lost during erythroid maturation resulting in mature erythrocytes which express CAA only. These studies indicate that both the erythroid differentiation/maturation stage and the developmental age of the chicken influence CFA and CAA antigenic expression on erythroid cells undergoing cellular differentiation/maturation in the bone marrow. 相似文献
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H A Manjarrez-Hernandez B Amess L Sellers T J Baldwin S Knutton P H Williams A Aitken 《FEBS letters》1991,292(1-2):121-127
Previous studies on the mechanism of enteropathogenic Escherichia coli (EPEC) infection have revealed an increase in the phosphorylation state of a number of proteins in human laryngeal HEp-2 cells. The most prominent was an acidic phosphoprotein(s) of Mr 20-21 kDa. The present study reports: (a) a simple method for purification of phosphorylated 20 kDa protein; (b) identification of the 20 kDa phosphoprotein as myosin light chain; and (c) that the phorbol ester, TPA, also increased the phosphorylation of the 20 kDa myosin light chain. In contrast to the effects of EPEC, TPA stimulation resulted in the dissociation of myosin from the cytoskeleton to the cytosol. 相似文献
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Three strains of Chlorella were examined, by serological procedures for cellular antigenic differences. Antibodies produced in rabbits against, the 3 different Chlorella strains demonstrated the presence of antigens common to all 3 strains. Adsorbed antisera identified antigens specific for each, strain. 相似文献
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