Activities of the protein kinases STK, PI3K, MEK, and ERK are required for the development of the head organizer in Hydra magnipapillata.
The development of the hydra's head and its hypostome has been studied at the molecular level. Many genes have been cloned from hydra as potential candidates that control the development of its head. Much work was performed on the mechanisms controlling expression of these genes in the position-dependent manner. Moreover, there have been data to support the involvement of three main signaling pathways that involve PKC, SRC, and PI3K kinases in the regulation of the head formation and in the expression of several head-specific genes. In this report, we present data supporting the participation of these three signaling pathways on the development of the hypostome. We used grafting experiments and inhibitors of the specific kinases to show the participation of these enzymes in hypostome formation. From our results, we postulate that these signal transduction pathways regulate the very early stages of the head development, most likely at the point when the cells start to differentiate to form the head organizer.
Arvizu
Fernando
F
Department of Biochemistry, CINVESTAV, D.F. 07001, México.
Aguilera
Asdrubal
A
Salgado
Luis M
LM
D000818:Animals; D019521:Body Patterning / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D048049:Extracellular Signal-Regulated MAP Kinases / Q000037:antagonists & inhibitors / Q000502:physiology*; D006829:Hydra / Q000033:anatomy & histology / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development*; D020930:MAP Kinase Kinase Kinases / Q000037:antagonists & inhibitors / Q000502:physiology*; D019869:Phosphatidylinositol 3-Kinases / Q000502:physiology*; D000081082:Phosphoinositide-3 Kinase Inhibitors; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000502:physiology; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000502:physiology*; D015398:Signal Transduction
D004791:Enzyme Inhibitors; D048049:Extracellular Signal-Regulated MAP Kinases; D020930:MAP Kinase Kinase Kinases; D019869:Phosphatidylinositol 3-Kinases; D000081082:Phosphoinositide-3 Kinase Inhibitors; D011493:Protein Kinase C; D020794:Receptor Protein-Tyrosine Kinases; C080835:RON protein