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XB-ART-2249
Dev Growth Differ January 1, 2005; 47 (1): 37-48.

The mode and molecular mechanisms of the migration of presumptive PGC in the endoderm cell mass of Xenopus embryos.

Nishiumi F , Komiya T , Ikenishi K .


Abstract
We investigated the mode of migration of presumptive primordial germ cells (pPGC) in the endoderm cell mass of Xenopus embryos at stages 7-40. The molecules underlying the migration were also studied cytochemically and immunocytologically. By examining the relative positions of pPGC and somatic cells derived from the single, fluorescein-dextran lysine (FDL)-injected, germ plasm-bearing cells of stage 6 embryos, pPGC in embryos at stages 7-23 and those at stages later than 24 were assumed to passively and actively migrate in the endoderm cell mass, respectively. This assumption was supported by the observation that F-actin, essential for active cell migration, was recognized on pPGC of the latter stages, but never on those of the former ones. In addition, the molecule like CXC chemokine receptor 4 (CXCR4) found on directionally migrating PGC in mouse and zebrafish, probably Xenopus CXCR4 (xCXCR4), was detected on pPGC only at latter stages. Accordingly, F-actin and xCXCR4, and probably beta1-integrin and collagen type IV, which are indispensable for the formation of F-actin, are thought to be involved in the active migration of pPGC in the endoderm cell mass.

PubMed ID: 15740585
Article link: Dev Growth Differ


Species referenced: Xenopus laevis
Genes referenced: actb cxcl12 cxcr4 ddx4 fn1 itgb1 pgc
Antibodies: Ddx4 Ab1


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