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Coordination in gene expression during atherogenesis

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Abstract

General tendencies in the regulation of gene expression during atherogenesis were investigated using correlation analysis for 34 mRNA species of several functional groups. The contents of mRNA were measured by quantitative PCR in samples of human aortal intima containing no lesions or atherosclerotic lesions of types I (initial lesions), II (fatty streaks), and Va (fibroatheromas). The coupling between mRNA contents in lesions and the same mRNAs in intact tissue was found to descend in the course of the disease progression. The data are in accordance with the opinion that successive morphologic types of atherosclerotic lesions correspond to steps of atherogenesis. In addition, the contents of individual mRNA species could correlate with each other within the given sample type, the extent of this coupling rising along with the disease progression. The exception from this rule was a collapse in coupling for several functional groups of mRNA in lesions of type I. This collapse could indicate special position of these lesions in pathogenesis. Statistically significant correlations between mRNAs found in samples of all four types comprised in total about 50% of all possible correlations. 66% of these correlations were conservative, i.e. observed in at least two sample types. By coupling-strength, the studied mRNAs could be divided into four clusters whose composition significantly varied along with the disease progression. The disease progression was also associated with decline in number of regulatory factors that determine coordination in expression of the analyzed genes.

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Abbreviations

ABCA1 and ABCG1:

ATP-binding cassette transporters A1 and G1

ACAT1:

acyl-CoA-cholesterol acyltransferase 1

ApoE:

apolipoprotein E

AR:

androgen receptor

Arom:

aromatase

CCL18:

C-C motif-containing chemokine 18

CD36, CD63, and CD68:

differentiation clusters 36, 63, and 68

CEH:

cholesteryl ester neutral hydrolase

EEA1:

early endosome antigen 1

ERα:

estrogen receptor alpha

EST:

estrogen sulfotransferase

GAPDH:

glyceraldehyde-3-phosphate dehydrogenase

GNB2L1:

guanine nucleotide-binding protein, beta-peptide 2-like 1

ICAM1:

intercellular adhesion molecule 1

Lamp 1/2:

lysosome-associated membrane glycoproteins 1 and 2

LDLR:

low density lipoprotein receptor

LXRα and LXRβ:

liver X receptors alpha and beta

p62:

ubiquitin-binding protein p62

PPARα and PPARγ:

peroxisome proliferator-activated receptors alpha and gamma

Rab5a:

Ras-related small GTPase 5A

SELE:

selectin E

SR-A:

scavenger receptor A

SR-BI:

scavenger receptor BI

SREBP1 and SREBP2:

sterol regulatory element-binding proteins 1 and 2

STS:

steroid sulfatase

TfR1:

transferrin receptor 1

TLR4:

Toll-like receptor 4

TNFα:

tumor necrosis factor alpha

VCAM1:

vascular cell adhesion molecule 1

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Correspondence to T. A. Shchelkunova.

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Published in Russian in Biokhimiya, 2013, Vol. 78, No. 8, pp. 1187–1200.

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Shchelkunova, T.A., Morozov, I.A., Rubtsov, P.M. et al. Coordination in gene expression during atherogenesis. Biochemistry Moscow 78, 933–945 (2013). https://doi.org/10.1134/S0006297913080117

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