Premium
Differential Expressions of Two Types of Alkaline Phosphatase during Developmental Growth of Embryoid Bodies of Mouse Teratocarcinoma OTT‐6050 In Vitro
Author(s) -
MATSUZAWA TETSURO,
OJIMAKASAHARA SAKIKO,
KITAMURA MASANOBU
Publication year - 1988
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1988.00471.x
Subject(s) - alkaline phosphatase , embryoid body , totipotent , biology , teratocarcinoma , biochemistry , cytochemistry , endoderm , in vitro , germ layer , microbiology and biotechnology , cellular differentiation , chemistry , embryonic stem cell , enzyme , induced pluripotent stem cell , adult stem cell , gene , endothelial stem cell
Ascites teratocarcinoma OTT‐6050 is a totipotent tumor line producing indefinitely the simple type of embry‐oid bodies (EBs). In culture with fetal calf serum (FCS) in Eagle's minimal essential medium (MEM), these EBs show developmental growth, only in which some differentiative events result. EBs also show this developmental growth in MEM supplemented with two fractions of FCS separated with a Amicon PM 10 membrane, i.e. a low molecular weight Fraction L (mol. wt. less than 10,000) and a high molecular weight Fraction H (mol. wt. more than 10,000). Fraction H is necessary for the survival of EBs in vitro. Fraction L enhances the uptake of 3 H‐thymidine into EB cells with increase in the Vmax , but no change in the K m. On culture of EBs with both Fractions, a marked bimodal increase in alkaline phosphatase (ALPase) activity is seen on day 1–2 and 4, resulting from the differential expressions of two electrophoretically distinct ALPases (Bands I and II). The differential expressions of ALPase are also observed cytochemically, one activity being on the inner cells and the other on the surrounding cells of EBs. From the cytochemical similarity of ALPase activity to that of normal mouse embryos, Band I ALPase is inferred to be the epiblast (developmentally totipotent stem cell)‐type and Band II ALPase to be the distal (parietal) endoderm‐type.