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BB rat Gimap gene expression in sorted lymphoid T and B cells
Ist Teil von
Life sciences (1973), 2011-11, Vol.89 (19), p.748-754
Ort / Verlag
Netherlands: Elsevier Inc
Erscheinungsjahr
2011
Quelle
MEDLINE
Beschreibungen/Notizen
The
Gimap gene family has been shown to be integral to T cell survival and development. A frameshift mutation in
Gimap5, one of seven members of the
Gimap family, results in lymphopenia and is a prerequisite for spontaneous type 1 diabetes (T1D) in the BioBreeding (BB) rat. While not contributing to lymphopenia, the
Gimap family members proximal to
Gimap5, encompassed within the
Iddm39 quantitative trait locus (QTL), have been implicated in T1D. We hypothesized that expression of the
Gimap family members within the
Iddm39 QTL, during thymocyte development as well as in peripheral T and B cells contribute to T1D.
Cell sorted subpopulations were analyzed by quantitative real time (qRT) PCR.
Gimap4 expression was reduced in DR.
lyp/lyp
rat double negative, double positive and CD8 single positive (SP) thymocytes while expression of
Gimap8,
Gimap6, and
Gimap7 was reduced only in CD8 SP thymocytes. Interestingly, expression of the entire
Gimap gene family was reduced in DR.
lyp/lyp
rat peripheral T cells compared to non-lymphopenic, non-diabetic DR.
+/+
rats. With the exception of
Gimap6, the
Gimap family genes were not expressed in B cells from spleen and mesenteric lymph node (MLN). Expression of
Gimap9 was only detected in hematopoietic cells of
non B cell lineage such as macrophage, dendritic or NK cells.
These results suggest that lack of the Gimap5 protein in the DR.
lyp/lyp
congenic rat was associated with impaired expression of the entire family of
Gimap genes and may regulate T cell homeostasis in the peripheral lymphoid organs.