title: Loss of hippocampal CA3 pyramidal neurons in mice lacking STAM1.
abstract: STAM1, a member of the STAM (signal transducing adapter molecule) family, has a unique structure containing a Src homology 3 domain and ITAM (immunoreceptor tyrosine-based activation motif). STAM1 was previously shown to be associated with the Jak2 and Jak3 tyrosine kinases and to be involved in the regulation of intracellular signal transduction mediated by interleukin-2 (IL-2) and granulocyte-macrophage colony-stimulating factor (GM-CSF) in vitro. Here we generated mice lacking STAM1 by using homologous recombination with embryonic stem cells. STAM1(-/-) mice were morphologically indistinguishable from their littermates at birth. However, growth retardation in the third week after birth was observed for the STAM1(-/-) mice. Unexpectedly, despite the absence of STAM1, hematopoietic cells, including T- and B-lymphocyte and other hematopoietic cell populations, developed normally and responded well to several cytokines, including IL-2 and GM-CSF. However, histological analyses revealed the disappearance of hippocampal CA3 pyramidal neurons in STAM1(-/-) mice. Furthermore, we observed that primary hippocampal neurons derived from STAM1(-/-) mice are vulnerable to cell death induced by excitotoxic amino acids or an NO donor. These data suggest that STAM1 is dispensable for cytokine-mediated signaling in lymphocytes but may be involved in the survival of hippocampal CA3 pyramidal neurons.
authors.affiliation: Department of Microbiology and Immunology, Sendai 980-8575, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Takeshita
authors.forename: S
authors.initials: S
authors.lastname: Miura
authors.forename: K
authors.initials: K
authors.lastname: Murata
authors.forename: Y
authors.initials: Y
authors.lastname: Kimura
authors.forename: N
authors.initials: N
authors.lastname: Ishii
authors.forename: M
authors.initials: M
authors.lastname: Nose
authors.forename: H
authors.initials: H
authors.lastname: Sakagami
authors.forename: H
authors.initials: H
authors.lastname: Kondo
authors.forename: F
authors.initials: F
authors.lastname: Tashiro
authors.forename: J I
authors.initials: JI
authors.lastname: Miyazaki
authors.forename: H
authors.initials: H
authors.lastname: Sasaki
authors.forename: K
authors.initials: K
authors.lastname: Sugamura
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D001522:Behavior, Animal; D001921:Brain / Q000378:metabolism; D002478:Cells, Cultured; D004198:Disease Susceptibility; D056827:Endosomal Sorting Complexes Required for Transport; D005260:Female; D005298:Fertility; D015870:Gene Expression; D018390:Gene Targeting; D006624:Hippocampus / Q000002:abnormalities* / Q000473:pathology; D007376:Interleukin-2 / Q000378:metabolism; D007608:Kainic Acid / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009474:Neurons; D010641:Phenotype; D010750:Phosphoproteins / Q000235:genetics / Q000502:physiology*; D012640:Seizures; D013347:Subcellular Fractions; D013601:T-Lymphocytes / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D056827:Endosomal Sorting Complexes Required for Transport; D007376:Interleukin-2; D010750:Phosphoproteins; C491648:Stam protein, mouse; D007608:Kainic Acid