首页> 美国卫生研究院文献>Biochemical Journal >Postnatal development of rat colon epithelial cells is associated with changes in the expression of the beta 14-N-acetylgalactosaminyltransferase involved in the synthesis of Sda antigen of alpha 26-sialyltransferase activity towards N-acetyl-lactosamine.
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Postnatal development of rat colon epithelial cells is associated with changes in the expression of the beta 14-N-acetylgalactosaminyltransferase involved in the synthesis of Sda antigen of alpha 26-sialyltransferase activity towards N-acetyl-lactosamine.

机译:大鼠结肠上皮细胞的出生后发育与β14-N-乙酰半乳糖胺基转移酶的表达变化有关该β14-N-乙酰半乳糖胺基转移酶的合成涉及对N-乙酰-乳糖胺的α26-唾液酸转移酶活性的Sda抗原的合成。

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摘要

beta 1,4-N-Acetylgalactosaminyltransferase (beta 1,4GalNAc-transferase) and alpha 2,3-sialyltransferase are both involved in the biosynthesis of the Sda blood group antigen, which is also present in cells of large intestine. The expression of these enzymes and of alpha 2,6-sialyltransferase activity towards N-acetyl-lactosamine was investigated in rat intestinal cells and correlated with both cell differentiation and extent of postnatal maturation. The beta 1,4GalNAc-transferase activity was exclusively found in epithelial cells of the large intestine, preferentially in the proximal segments suggesting a proximal-distal gradient of expression. The beta 1,4GalNAc-transferase and alpha 2,3-sialyltransferase activity towards N-acetyl-lactosamine were expressed in all cell fractions of the colonic crypt, with a maximum activity in the deeply located cells; therefore Sda antigen biosynthesis appears to occur preferentially at a specific stage of cell differentiation. By using N-acetyl-lactosamine as an acceptor, the predominant sialyltransferase in the colon cells was that capable of adding sialic acid in the alpha 2,3- linkage, whereas in the ileum cells the major enzyme was that forming the alpha 2,6-isomer. There were dramatic changes in the expression of colonic beta 1,4GalNac-transferase and of alpha 2,6-sialyltransferase activity towards N-acetyl-lactosamine during postnatal maturation. The former enzyme, practically absent at birth, increased slowly in the first days of life and then rapidly after weaning; by contrast, the latter enzyme was largely expressed only in newborn animals. As the colonic alpha 2,3-sialyltransferase activity towards N-acetyl-lactosamine did not change during the postnatal period, the ratio between the alpha 2,6- and alpha 2,3-sialyltransferase activities was reversed after weaning.
机译:β1,4-N-乙酰半乳糖胺基转移酶(β1,4GalNAc-转移酶)和α2,3-唾液酸转移酶均参与Sda血型抗原的生物合成,Sda血型抗原也存在于大肠细胞中。在大鼠肠道细胞中研究了这些酶的表达以及对N-乙酰基-乳糖胺的α2,6-唾液酸转移酶活性,并与细胞分化和出生后成熟程度相关。 β1,4GalNAc-转移酶活性仅在大肠的上皮细胞中发现,优先在近端区段中提示存在近端-远端表达梯度。在结肠隐窝的所有细胞级分中均表现出针对N-乙酰基-乳糖胺的beta 1,4GalNAc转移酶和alpha 2,3-唾液酸转移酶活性,在深处的细胞中具有最大的活性。因此,Sda抗原的生物合成似乎优先发生在细胞分化的特定阶段。通过使用N-乙酰基-乳糖胺作为受体,结肠细胞中主要的唾液酸转移酶是能够在α2,3-键中添加唾液酸的酶,而在回肠细胞中,主要酶是形成α2,6的酶。 -异构体。产后成熟期间,结肠β1,4GalNac-转移酶的表达和α2,6-唾液酸转移酶对N-乙酰-乳糖胺的活性发生了显着变化。前一种酶几乎在出生时就不存在,在生命的最初几天缓慢增加,而在断奶后迅速增加。相反,后一种酶仅在新生动物中大量表达。由于在出生后结肠对N-乙酰基-乳糖胺的结肠α2,3-唾液酸转移酶活性没有变化,因此断奶后α2,6-唾液酸转移酶和α2,3-唾液酸转移酶活性之间的比例发生了变化。

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