Natsumi Hosoya

Uneven distribution pattern and increasing numbers of mesenchyme cells during development in the starfish, Asterina pectinifera

During development, the embryos and larvae of the starfish Asterina pectinifera possess a single type of mesenchyme cell. The aim of this study was to determine the patterns of behavior of mesenchyme cells during the formation of various organs. To this end, we used a monoclonal antibody (mesenchyme cell marker) to identify the distribution patterns and numbers of mesenchyme cells. Our results revealed the following: (i) mesenchyme cell behavior differs in the formation of different organs, showing temporal variations and an uneven pattern of distribution; and (ii) mesenchyme cells continue to be generated throughout development, and their numbers are tightly regulated in proportion to total cell numbers.

A Monoclonal Antibody Raised Against an 86-kD Subunit of Human DNA Helicase II

Abstract Here we produced a monoclonal antibody (termed as mH2) which specifically recognized an 86-kD subunit of Human DNA helicase II (p86) in HeLa cells. Immunohistochemical analysis of p86 throughout the cell cycle showed that its localization was changed from the nuclei to the cytoplasm, when the cells entered into prophase, and p86 localized diffusely in the cytoplasm during mitosis. Double staining of interphase HeLa cells with mH2 and an antibody, which recognized a component of nuclear pore complex, showed that p86 did not localize at the nuclear envelop in interphase cells.