A ROLE OF ANGIOTENSIN-CONVERTING ENZYME IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE SUMMARY

Activation of angiotensin-converting enzyme (ACE) is observed in lung tissues, induced sputum (IS), and, to a lesser extent in blood serum. Vascular hypertension is noted in 40 % of patients with chronic obstructive pulmonary disease (COPD). Therefore, many COPD patients receive ACE inhibitor therapy. Studies of ACE production by specific protein levels or ACE1 gene expression may represent sufficient clinical interest in COPD and upon its treatment using hypotensive drugs.

The objective of the work was to study the normal ACE1 expression in control persons and COPD patients, and to assess correlations between the АСЕ1 genotypes and clinical parameters in patients with COPD.

Materials and methods. The study included 124 patients with grade II-III COPD. ACE1 activity in blood leukocytes was determined by means of qPCR using fluorescent probes. As a reference gene for data normalization, the GAPDH gene was selected. The data on gene expression were evaluated according to the ∆∆Cq method. The insertion/deletion (I/D) polymorphism of the АСЕ1 gene was determined with standard PCR technique according to the amplicon length after their detecting in agarose gel.

Results. We have found a significantly increased AСЕ1 gene expression among patients with COPD upon exacerbation and after treatment, compared to control group. Frequencies of I/D genotypes and АСЕ1 gene alleles did not differ significantly between total group of patients and comparison groups, thus showing no association between this polymorphism and COPD risk. In combined sample group (95 tests), the D/D genotype has shown a moderate, but significant correlation with ACE1 mRNA expression in peripheral blood leukocytes.

chronic obstructive pulmonary disease, ACE gene expression, ACE gene polymorphism, correlation

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