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Unexpected phenotype of mice lacking Shcbp1, a protein induced during T cell proliferation.

ABSTRACT: T cell development and activation are highly regulated processes, and their proper execution is important for a competent immune system. Shc SH2-domain binding protein-1 (Shcbp1) is an evolutionarily conserved protein that binds to the adaptor protein ShcA. Studies in Drosophila and in cell lines have strongly linked Shcbp1 to cell proliferation, embryonic development, growth factor signaling, and tumorigenesis. Here we show that Shcbp1 expression is strikingly upregulated during the ?-selection checkpoint in thymocytes, and that its expression tightly correlates with proliferative stages of T cell development. To evaluate the role for Shcbp1 during thymic selection and T cell function in vivo, we generated mice with global and conditional deletion of Shcbp1. Surprisingly, the loss of Shcbp1 expression did not have an obvious effect during T cell development. However, in a mouse model of experimental autoimmune encephalomyelitis (EAE), which depends on CD4(+) T cell function and mimics multiple features of the human disease multiple sclerosis, Shcbp1 deficient mice had reduced disease severity and improved survival, and this effect was T cell intrinsic. These data suggest that despite the striking upregulation of Shcbp1 during T cell proliferation, loss of Shcbp1 does not directly affect T cell development, but regulates CD4(+) T cell effector function in vivo.

SUBMITTER: Buckley MW

PROVIDER: S-EPMC4143286 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Unexpected phenotype of mice lacking Shcbp1, a protein induced during T cell proliferation.

Buckley Monica W MW Arandjelovic Sanja S Trampont Paul C PC Kim Taeg S TS Braciale Thomas J TJ Ravichandran Kodi S KS

PloS one 20140825 8

T cell development and activation are highly regulated processes, and their proper execution is important for a competent immune system. Shc SH2-domain binding protein-1 (Shcbp1) is an evolutionarily conserved protein that binds to the adaptor protein ShcA. Studies in Drosophila and in cell lines have strongly linked Shcbp1 to cell proliferation, embryonic development, growth factor signaling, and tumorigenesis. Here we show that Shcbp1 expression is strikingly upregulated during the β-selection ...[more]

PMID: 25153088

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Project description:The protein α -synuclein is considered central to the pathogenesis of Parkinson disease (PD) on genetic and histopathological grounds. It is widely expressed in fetal life and continues to be highly expressed in adult neural tissues, red blood cells and platelets, while the remainder of adult tissues are reported to have little or no expression. Despite cellular and molecular evidence for a role in neuronal function including synaptic vesicle trafficking, neurotransmitter release, mitochondrial function, lipid metabolism, neurogenesis, neuroprotection, and neuromelanin biosynthesis, mice ablated for the gene encoding α -synuclein (Snca) have little or no neurological phenotype. Thus, nearly 20 years of intensive study have yet to reveal conclusively what the normal function of this highly abundant protein is in the nervous system. Interestingly, α -synuclein has also been shown to have enzymatic activity as a ferrireductase capable of reducing Fe+3 to Fe+2. Given its abundant expression in red blood cells, we set out to explore the role of α -synuclein in converting chemically-induced Fe+3 methemoglobin to normal Fe+2 hemoglobin. Initial in vivo experiments with the potent methemoglobin inducer, para-aminopropiophenone and its active metabolite, 4-hydroxy para-aminopropiophenone, demonstrated significantly greater and more prolonged methemoglobinemia in Snca-/- mice compared to Snca+/+ mice. In vitro experiments with red blood cells, however, and in vivo experiments in genetically engineered mouse strains that differ in their α -synuclein expression in various tissues, including the nervous system, red blood cells and liver, revealed that contrary to the initial hypothesis, a lack of expression of α -synuclein in red blood cells did not correlate with higher levels or more prolonged duration of methemoglobinemia. Instead, the greater sensitivity to chemically induced methemoglobinemia correlated with the absence of hepatic α -synuclein expression. We have uncovered a new and robust whole-animal phenotype in mice lacking α -synuclein that reflects its hitherto unrecognized role in xenobiotic detoxification.

Dataset Information

Unexpected phenotype of mice lacking Shcbp1, a protein induced during T cell proliferation.

Publications

Unexpected phenotype of mice lacking Shcbp1, a protein induced during T cell proliferation.

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