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Association of chemerin mRNA expression in human epicardial adipose tissue with coronary atherosclerosis.

Gao X, Mi S, Zhang F, Gong F, Lai Y, Gao F, Zhang X, Wang L, Tao H - Cardiovasc Diabetol (2011)

Bottom Line: We found that EAT of CAD group showed significantly higher levels of chemerin and TNF-alpha mRNA, and significantly lower level of adiponectin mRNA than that of NCAD patients.In CAD group, significantly higher levels of chemerin mRNA and protein were observed in EAT than in paired subcutaneous adipose tissue (SAT), whereas such significant difference was not found in NCAD group.Likewise, neither serum chemerin nor serum adiponectin was associated with Gensini score (P > 0.05).

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Endocrinology, The Key Laboratory of Remodeling-related Cardiovascular Diseases, Beijing Anzhen Hospital, Capital Medical University, Ministry of Education, Beijing, 100029, China.

ABSTRACT

Background: Growing evidence suggests that epicardial adipose tissue (EAT) may play a key role in the pathogenesis and development of coronary artery disease (CAD) by producing several inflammatory adipokines. Chemerin, a novel adipokine, has been reported to be involved in regulating immune responses and glucolipid metabolism. Given these properties, chemerin may provide an interesting link between obesity, inflammation and atherosclerosis. In this study, we sought to determine the relationship of chemerin expression in EAT and the severity of coronary atherosclerosis in Han Chinese patients.

Methods: Serums and adipose tissue biopsies (epicardial and thoracic subcutaneous) were obtained from CAD (n = 37) and NCAD (n = 16) patients undergoing elective cardiac surgery. Gensini score was used to assess the severity of CAD. Serum levels of chemerin, adiponectin and insulin were measured by ELISA. Chemerin protein expression in adipose tissue was detected by immunohistochemistry. The mRNA levels of chemerin, chemR23, adiponectin and TNF-alpha in adipose tissue were detected by RT-PCR.

Results: We found that EAT of CAD group showed significantly higher levels of chemerin and TNF-alpha mRNA, and significantly lower level of adiponectin mRNA than that of NCAD patients. In CAD group, significantly higher levels of chemerin mRNA and protein were observed in EAT than in paired subcutaneous adipose tissue (SAT), whereas such significant difference was not found in NCAD group. Chemerin mRNA expression in EAT was positively correlated with Gensini score (r = 0.365, P < 0.05), moreover, this correlation remained statistically significant (r = 0.357, P < 0.05) after adjusting for age, gender, BMI and waist circumference. Chemerin mRNA expression in EAT was also positively correlated with BMI (r = 0.305, P < 0.05), waist circumference (r = 0.384, P < 0.01), fasting blood glucose (r = 0.334, P < 0.05) and negatively correlated with adiponectin mRNA expression in EAT (r = -0.322, P < 0.05). However, there were no significant differences in the serum levels of chemerin or adiponectin between the two groups. Likewise, neither serum chemerin nor serum adiponectin was associated with Gensini score (P > 0.05).

Conclusions: The expressions of chemerin mRNA and protein are significantly higher in EAT from patients with CAD in Han Chinese patients. Furthermore, the severity of coronary atherosclerosis is positive correlated with the level of chemerin mRNA in EAT rather than its circulating level.

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Immunohistochemical analysis for chemerin in EAT and SAT. (A): the representative slides of EAT and SAT are from a patient with CAD (a and b) and a patient without CAD (c and d) separately (magnified × 400). Negative control with omission of primary antibody (e). (B): the result of quantitative analysis of immunohistochemistry for chemerin in EAT and SAT of the two groups (CAD group, n = 6; NCAD group, n = 6). * indicates P < 0.05, EAT of CAD group vs. EAT of NCAD group. ** indicates P < 0.01 as determined by paired t-test, EAT of CAD group vs. SAT of CAD group. Abbreviations: EAT, epicardial adipose tissue; SAT, subcutaneous adipose tissue; IOD, integrated optical density.
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Figure 1: Immunohistochemical analysis for chemerin in EAT and SAT. (A): the representative slides of EAT and SAT are from a patient with CAD (a and b) and a patient without CAD (c and d) separately (magnified × 400). Negative control with omission of primary antibody (e). (B): the result of quantitative analysis of immunohistochemistry for chemerin in EAT and SAT of the two groups (CAD group, n = 6; NCAD group, n = 6). * indicates P < 0.05, EAT of CAD group vs. EAT of NCAD group. ** indicates P < 0.01 as determined by paired t-test, EAT of CAD group vs. SAT of CAD group. Abbreviations: EAT, epicardial adipose tissue; SAT, subcutaneous adipose tissue; IOD, integrated optical density.

Mentions: We performed immunohistochemistry to illustrate chemerin expression in adipose tissue. EAT and SAT samples were collected randomly from the CAD group (n = 6) and the NCAD group (n = 6), respectively. Figure 1A showed the representative slides of EAT and SAT from one patient with CAD (Figure 1A-a and 1A-b) and one without CAD (Figure 1A-c and 1A-d). Immunohistochemical staining revealed that chemerin was expressed in both EAT and SAT of the two groups. Furthermore, as shown in Figure 1B, quantitative analysis of immunohistochemistry revealed that the amounts of chemerin protein in EAT were higher in the patients with CAD than those without CAD (70128.28 ± 13068.83 vs. 52312.03 ± 9899.90, P < 0.05). For the CAD group, significantly higher level of chemerin protein was found in EAT than in SAT (70128.28 ± 13068.83 vs. 42942.04 ± 15460.67, P < 0.01), whereas no significant difference was found between EAT and SAT in the NCAD group (52312.03 ± 9899.90 vs. 50533.71 ± 17289.54, P = 0.871).


Association of chemerin mRNA expression in human epicardial adipose tissue with coronary atherosclerosis.

Gao X, Mi S, Zhang F, Gong F, Lai Y, Gao F, Zhang X, Wang L, Tao H - Cardiovasc Diabetol (2011)

Immunohistochemical analysis for chemerin in EAT and SAT. (A): the representative slides of EAT and SAT are from a patient with CAD (a and b) and a patient without CAD (c and d) separately (magnified × 400). Negative control with omission of primary antibody (e). (B): the result of quantitative analysis of immunohistochemistry for chemerin in EAT and SAT of the two groups (CAD group, n = 6; NCAD group, n = 6). * indicates P < 0.05, EAT of CAD group vs. EAT of NCAD group. ** indicates P < 0.01 as determined by paired t-test, EAT of CAD group vs. SAT of CAD group. Abbreviations: EAT, epicardial adipose tissue; SAT, subcutaneous adipose tissue; IOD, integrated optical density.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3198902&req=5

Figure 1: Immunohistochemical analysis for chemerin in EAT and SAT. (A): the representative slides of EAT and SAT are from a patient with CAD (a and b) and a patient without CAD (c and d) separately (magnified × 400). Negative control with omission of primary antibody (e). (B): the result of quantitative analysis of immunohistochemistry for chemerin in EAT and SAT of the two groups (CAD group, n = 6; NCAD group, n = 6). * indicates P < 0.05, EAT of CAD group vs. EAT of NCAD group. ** indicates P < 0.01 as determined by paired t-test, EAT of CAD group vs. SAT of CAD group. Abbreviations: EAT, epicardial adipose tissue; SAT, subcutaneous adipose tissue; IOD, integrated optical density.
Mentions: We performed immunohistochemistry to illustrate chemerin expression in adipose tissue. EAT and SAT samples were collected randomly from the CAD group (n = 6) and the NCAD group (n = 6), respectively. Figure 1A showed the representative slides of EAT and SAT from one patient with CAD (Figure 1A-a and 1A-b) and one without CAD (Figure 1A-c and 1A-d). Immunohistochemical staining revealed that chemerin was expressed in both EAT and SAT of the two groups. Furthermore, as shown in Figure 1B, quantitative analysis of immunohistochemistry revealed that the amounts of chemerin protein in EAT were higher in the patients with CAD than those without CAD (70128.28 ± 13068.83 vs. 52312.03 ± 9899.90, P < 0.05). For the CAD group, significantly higher level of chemerin protein was found in EAT than in SAT (70128.28 ± 13068.83 vs. 42942.04 ± 15460.67, P < 0.01), whereas no significant difference was found between EAT and SAT in the NCAD group (52312.03 ± 9899.90 vs. 50533.71 ± 17289.54, P = 0.871).

Bottom Line: We found that EAT of CAD group showed significantly higher levels of chemerin and TNF-alpha mRNA, and significantly lower level of adiponectin mRNA than that of NCAD patients.In CAD group, significantly higher levels of chemerin mRNA and protein were observed in EAT than in paired subcutaneous adipose tissue (SAT), whereas such significant difference was not found in NCAD group.Likewise, neither serum chemerin nor serum adiponectin was associated with Gensini score (P > 0.05).

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Endocrinology, The Key Laboratory of Remodeling-related Cardiovascular Diseases, Beijing Anzhen Hospital, Capital Medical University, Ministry of Education, Beijing, 100029, China.

ABSTRACT

Background: Growing evidence suggests that epicardial adipose tissue (EAT) may play a key role in the pathogenesis and development of coronary artery disease (CAD) by producing several inflammatory adipokines. Chemerin, a novel adipokine, has been reported to be involved in regulating immune responses and glucolipid metabolism. Given these properties, chemerin may provide an interesting link between obesity, inflammation and atherosclerosis. In this study, we sought to determine the relationship of chemerin expression in EAT and the severity of coronary atherosclerosis in Han Chinese patients.

Methods: Serums and adipose tissue biopsies (epicardial and thoracic subcutaneous) were obtained from CAD (n = 37) and NCAD (n = 16) patients undergoing elective cardiac surgery. Gensini score was used to assess the severity of CAD. Serum levels of chemerin, adiponectin and insulin were measured by ELISA. Chemerin protein expression in adipose tissue was detected by immunohistochemistry. The mRNA levels of chemerin, chemR23, adiponectin and TNF-alpha in adipose tissue were detected by RT-PCR.

Results: We found that EAT of CAD group showed significantly higher levels of chemerin and TNF-alpha mRNA, and significantly lower level of adiponectin mRNA than that of NCAD patients. In CAD group, significantly higher levels of chemerin mRNA and protein were observed in EAT than in paired subcutaneous adipose tissue (SAT), whereas such significant difference was not found in NCAD group. Chemerin mRNA expression in EAT was positively correlated with Gensini score (r = 0.365, P < 0.05), moreover, this correlation remained statistically significant (r = 0.357, P < 0.05) after adjusting for age, gender, BMI and waist circumference. Chemerin mRNA expression in EAT was also positively correlated with BMI (r = 0.305, P < 0.05), waist circumference (r = 0.384, P < 0.01), fasting blood glucose (r = 0.334, P < 0.05) and negatively correlated with adiponectin mRNA expression in EAT (r = -0.322, P < 0.05). However, there were no significant differences in the serum levels of chemerin or adiponectin between the two groups. Likewise, neither serum chemerin nor serum adiponectin was associated with Gensini score (P > 0.05).

Conclusions: The expressions of chemerin mRNA and protein are significantly higher in EAT from patients with CAD in Han Chinese patients. Furthermore, the severity of coronary atherosclerosis is positive correlated with the level of chemerin mRNA in EAT rather than its circulating level.

Show MeSH
Related in: MedlinePlus