References
Query Results -- Details
MGI Accession ID: MGI:3621256
J Number: J:107466
Other Accession IDs:
Title: TIM-2 is expressed on B cells and in liver and kidney and is a receptor for H-ferritin endocytosis.
Authors: Chen TT; Li L; Chung DH; Allen CD; Torti SV; Torti FM; Cyster JG; Chen CY; Brodsky FM; Niemi EC; Nakamura MC; Seaman WE; Daws MR
Journal: J Exp Med
Volume: 202
Issue: 7
Date: 2005 Oct 3
Year: 2005
Pages: 955-65
Review Status: Peer Reviewed
Abstract:
T cell immunoglobulin-domain and mucin-domain (TIM) proteins constitute a receptor family that was identified first on kidney and liver cells; recently it was also shown to be expressed on T cells. TIM-1 and -3 receptors denote different subsets of T cells and have distinct regulatory effects on T cell function. Ferritin is a spherical protein complex that is formed by 24 subunits of H- and L-ferritin. Ferritin stores iron atoms intracellularly, but it also circulates. H-ferritin, but not L-ferritin, shows saturable binding to subsets of human T and B cells, and its expression is increased in response to inflammation. We demonstrate that mouse TIM-2 is expressed on all splenic B cells, with increased levels on germinal center B cells. TIM-2 also is expressed in the liver, especially in bile duct epithelial cells, and in renal tubule cells. We further demonstrate that TIM-2 is a receptor for H-ferritin, but not for L-ferritin, and expression of TIM-2 permits the cellular uptake of H-ferritin into endosomes. This is the first identification of a receptor for ferritin and reveals a new role for TIM-2.
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