JOURNAL ARTICLE

Deletion of P2Y2 receptor reveals a role for lymphotoxin-α in fatty streak formation

Shaomin Qian, April Hoggatt, Yava L Jones-Hall, Carl F Ware, Paul Herring, Cheikh I Seye
Vascular Pharmacology 2016, 85: 11-20
27355755

BACKGROUND: Lymphotoxin alpha (LTα) is expressed in human atherosclerotic lesions and genetic variations in the LTα pathway have been linked to myocardial infarction. Activation of the P2Y2 nucleotide receptor (P2Y2R) regulates the production of LTα. in vitro. We aimed to uncover a potential pathway linking purinergic receptor to LTα-mediated inflammatory processes pivotal to the early stages of atherosclerosis in apolipoprotein E (ApoE(-)(/)(-)) deficient mice.

METHODS AND RESULTS: En face immunostaining revealed that P2Y2R and VCAM-1 are preferentially expressed in the atherosclerosis prone site of the mouse aortic sinus. Deletion of the P2Y2R gene suppresses VCAM-1 expression. Compared with ApoE(-)(/)(-) mice, ApoE(-)(/)(-) mice lacking the P2Y2R gene (ApoE(-)(/)(-)/P2Y2R(-)(/)(-)) did not develop fatty streak lesions when fed a standard chow diet for 15weeks. Systemic and CD4(+) T cell production of the pro-inflammatory cytokine lymphotoxin-alpha (LTα) were specifically inhibited in ApoE(-)(/)(-)/P2Y2R(-)(/)(-)mice. Anti-LTα preventive treatment was initiated in ApoE(-)(/)(-)mice with intraperitoneal administration of recombinant human tumor necrosis factor receptor 1 fusion protein (TNFR1-Fc) on 5 consecutive days before the disease onset. Remarkably, none of the TNFR1:Fc-treated ApoE(-)(/)(-)mice exhibited atherosclerotic lesions at any developmental stage.

SIGNIFICANCE: ApoE(-)(/)(-) mice deficient in P2Y2R exhibit low endothelial cell VCAM-1 levels, decreased production of LTα and delayed onset of atherosclerosis. These data suggest that targeting this nucleotide receptor could be an effective therapeutic approach in atherosclerosis.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Trending Papers

Remove bar
Read by QxMD icon Read
27355755
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"