Radiation is a risk factor for atherosclerotic cardiovascular disease. However, little is known about the mechanisms that underlie radiation-enhanced atherosclerosis. Our recent studies have identified H2, the murine MHC, as a major genetic determinant of susceptibility to radiation-enhanced atherosclerosis. C3H/HeJ (C3H) mice are extremely resistant to atherosclerosis, developing much smaller lesions than C57BL/6 (B6) mice when deficient in apolipoprotein E (apoE-/-) or fed an atherogenic diet. The two strains differ in the H2 haplotype with B6 having H2b and C3H having H2k. C3.SW-H2b/SnJ (C3.SW) is a congenic strain of C3H/HeJ in which the H2k locus is replaced with H2b. Surprisingly, C3.SW.apoE-/- mice that underwent bone marrow transplantation after lethal irradiation exhibited a 21-fold increase in atherosclerotic lesion size relative to C3H.apoE-/- mice receiving the same treatment, demonstrating the dramatic impact of H2 haplotypes on atherosclerosis. We will use this novel C3.SW.apoE-/- mouse model to investigate mechanistic links between H2 haplotypes and plaque formation. We will also test a promising candidate gene in the H2 region. MDC1, encoding the mediator of DNA damage checkpoint 1, is a component of the genome surveillance network activated by DNA double-strand breaks. Multiple SNPs have been detected in both coding and regulatory regions of MDC1 between H2b and H2k haplotypes. We will determine whether deficiency in MDC1 would promote atherosclerosis following radiation. These studies will shed light on new genes and new pathways that control atherosclerosis susceptibility.
Radiation therapy or radiotherapy is the most important non-surgical modality for the treatment of cancer and many proliferating, non-malignant conditions. However, patients receiving radiotherapy have an increased risk of developing atherosclerotic cardiovascular disease. The objective of this project is to identify genes in the major histocompatibility complex (MHC) region that have a dramatic influence on radiation-induced atherosclerosis.
|Garrett 3rd, Norman E; Grainger, Andrew T; Li, Jing et al. (2017) Genetic analysis of a mouse cross implicates an anti-inflammatory gene in control of atherosclerosis susceptibility. Mamm Genome 28:90-99|
|Grainger, Andrew T; Jones, Michael B; Chen, Mei-Hua et al. (2017) Polygenic Control of Carotid Atherosclerosis in a BALB/cJ × SM/J Intercross and a Combined Cross Involving Multiple Mouse Strains. G3 (Bethesda) 7:731-739|
|Grainger, Andrew T; Jones, Michael B; Li, Jing et al. (2016) Genetic analysis of atherosclerosis identifies a major susceptibility locus in the major histocompatibility complex of mice. Atherosclerosis 254:124-132|
|Grainger, Andrew T; Jones, Michael B; Li, Jing et al. (2016) Data on genetic analysis of atherosclerosis identifies a major susceptibility locus in the major histocompatibility complex of mice. Data Brief 9:1067-1069|
|Shi, Weibin; Wang, Qian; Choi, Wonseok et al. (2016) Mapping and Congenic Dissection of Genetic Loci Contributing to Hyperglycemia and Dyslipidemia in Mice. PLoS One 11:e0148462|
|Zhou, Wei; Chen, Mei-Hua; Shi, Weibin (2015) Influence of phthalates on glucose homeostasis and atherosclerosis in hyperlipidemic mice. BMC Endocr Disord 15:13|
|Wang, Qian; Grainger, Andrew T; Manichaikul, Ani et al. (2015) Genetic linkage of hyperglycemia and dyslipidemia in an intercross between BALB/cJ and SM/J Apoe-deficient mouse strains. BMC Genet 16:133|
|Liu, Shuiping; Li, Jing; Chen, Mei-Hua et al. (2015) Variation in Type 2 Diabetes-Related Phenotypes among Apolipoprotein E-Deficient Mouse Strains. PLoS One 10:e0120935|