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2017 ; 7
(1
): 15655
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Hypercholesterolemia Enhances T Cell Receptor Signaling and Increases the
Regulatory T Cell Population
#MMPMID29142309
Mailer RKW
; Gisterå A
; Polyzos KA
; Ketelhuth DFJ
; Hansson GK
Sci Rep
2017[Nov]; 7
(1
): 15655
PMID29142309
show ga
Hypercholesterolemia promotes the inflammation against lipoproteins in
atherosclerosis. Development of atherosclerosis is affected by the balance
between pro-inflammatory effector T cells and anti-inflammatory regulatory T
(Treg) cells. However, phenotype and function of T cell subpopulations in
hypercholesterolemia remain to be investigated. Here, we found that
cholesterol-containing diet increased the expression of the Treg cell
lineage-defining transcription factor FoxP3 among thymocytes and splenocytes.
Hypercholesterolemia elevated the FoxP3 expression level and population size of
peripheral Treg cells, but did not prevent enhanced proliferation of stimulated T
cells. Moreover, cholesterol supplementation in diet as well as in cell culture
medium promoted T cell antigen receptor (TCR) signaling in CD4+ T cells. Our
results demonstrate that hypercholesterolemia enhances TCR stimulation, Treg cell
development as well as T cell proliferation. Thus, our findings may help to
understand why hypercholesterolemia correlates with altered CD4+ T cell
responses.