Deficiency of invariant V alpha 14 natural killer T cells decreases atherosclerosis in LDL receptor null mice

Cardiovascular Research
Leah RogersStewart C Whitman

Abstract

CD1d-restricted natural killer T (NKT) cells function by regulating numerous immune responses during innate and adaptive immunity. Depletion of all populations of CD1d-dependent NKT cells has been shown by several groups to reduce atherosclerosis in two different mouse models of the disease. In this study, we determined if removal of a single (V alpha 14) NKT cell population protects mice from the disease. Targeted deletion of the J alpha 18 gene results in selective depletion of CD1d-dependent V alpha 14 NKT cells in C57BL/6 mice without affecting the population of other NKT, NK, and conventional T cells. Therefore, to study the effect of V alpha 14 NKT cell depletion on the progression of atherosclerosis, we examined the extent of lesion formation using paired littermate LDL receptor null mice that were either +/+ or -/- for the J alpha 18 gene following the feeding of these mice a cholesterol- and fat-enriched diet for 8 weeks. At the end of the study, we found no difference in either serum total- or lipoprotein-cholesterol distributions between groups. However, quantification of atherosclerosis revealed that V alpha 14 NKT cell deficiency significantly decreased lesion size in the aortic root (20-28%) and arch (28-38%) in b...Continue Reading

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Methods Mentioned

BETA
PCR
size exclusion chromatography
laser capture microdissection
Assay
ELISA

Software Mentioned

SigmaStat
Adobe Photoshop CS2
Pro Plus
SPSS
Image

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