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A novel splice variant of folate receptor 4 predominantly expressed in regulatory T cells.


ABSTRACT: BACKGROUND: Regulatory T cells (Tregs) are required for proper maintenance of immunological self-tolerance and immune homeostasis. Folate receptor 4 (FR4) is expressed at high levels in transforming growth factor-beta (TGF-?)-induced Tregs and natural Tregs. Moreover, antibody-mediated targeting of FR4 is sufficient to mediate Treg depletion. RESULTS: In this study, we describe a novel FR4 transcript variant, FR4D3, in which exon 3 is deleted. The mRNA of FR4D3 encodes a FR4 variant truncated by 189 bp. FR4D3 was found to be predominantly expressed in CD4(+)CD25(+) Treg cells. Overexpression of FR4D3 in CD4(+)CD25(+) Treg cells in vitro stimulated proliferation, which may modulate the ability of these cells to bind and incorporate folic acid. CONCLUSIONS: Our results suggested that high levels of FR4D3 may be critical to support the substantial proliferative capacity of Treg cells.

SUBMITTER: Tian Y 

PROVIDER: S-EPMC3724506 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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A novel splice variant of folate receptor 4 predominantly expressed in regulatory T cells.

Tian Yi Y   Wu Guoqiang G   Xing Jun-Chao JC   Tang Jun J   Zhang Yi Y   Huang Ze-Min ZM   Jia Zheng-Cai ZC   Zhao Ren R   Tian Zhi-Qiang ZQ   Wang Shu-Feng SF   Chen Xiao-Ling XL   Wang Li L   Wu Yu-Zhang YZ   Ni Bing B  

BMC immunology 20120613


<h4>Background</h4>Regulatory T cells (Tregs) are required for proper maintenance of immunological self-tolerance and immune homeostasis. Folate receptor 4 (FR4) is expressed at high levels in transforming growth factor-beta (TGF-β)-induced Tregs and natural Tregs. Moreover, antibody-mediated targeting of FR4 is sufficient to mediate Treg depletion.<h4>Results</h4>In this study, we describe a novel FR4 transcript variant, FR4D3, in which exon 3 is deleted. The mRNA of FR4D3 encodes a FR4 variant  ...[more]

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