research objectives: Vascular endothelial growth factor (VEGF) signaling may be required for maintenance of the alveolar compositions and alveolar septal cell apoptosis could contribute to the pathogenesis of COPD presenting emphysematous changes; however.

research objectives: Vascular endothelial growth factor (VEGF) signaling may be required for maintenance of the alveolar compositions and alveolar septal cell apoptosis could contribute to the pathogenesis of COPD presenting emphysematous changes; however, the public mutation at position 936 in the 3' untranslated region of the VEGF gene a C to T substitution (the C allele was denoted as 1 and the T allele as 2) VEGF936*2 has been reported to be associated with significantly lower VEGF plasma on a levels Based on these concepts, we hypothesized that VEGF936*1/2 polymorphism may be linked to the unravelling of COPD.

Design: The differences in VEGF936*1/2 allele oftenness were examined in 113 patients with smoking-related COPD and couple control groups (101 smoker/ex-smoker ascendency subjects and 102 population direction subjects) using the polymerase chain reaction-restriction fragment extent polymorphism technique.

Results: VEGF936*1/2 allele frequencies did not differ among the groups: 0792/0208 in COPD patients, 0822/0178 in smoker/ex-smoker direction subjects, and 0.842/0.152 in population have the direction of subjects.

Conclusion: The 936 C/T polymorphism of the VEGF gene (including one as well as the other homozygous and heterozygous) was not associated with the growth of COPD (odds ratio, 123; 95% confidence interval, 0760 to 1995)

lock opener words: emphysema; gene polymorphism; vascular endothelial pullulation factor

Abbreviations: AP-4 = activator protein-4; bp = base pair; PCR = polymerase chain reaction; 3'-UTR = 3' untranslated region; VEGF = vascular endothelial shooting factor

**********

The chronic airflow limitation characteristic of COPD is caused through a mixture of small airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema). (1) It is generally accepted that cigarette smoking is by means of far the most important risk factor for COPD Nevertheless, not all smoker acquire clinically significant COPD which allude tos that genetic factors must modify each individual's risk. It is believed that many genetic factors increase the risk of acquiring COPD A cogitation (2) demonstrated an increased risk of COPD within families with COPD probands. a certain of this risk may be to be ascribed to shared environmental factors, on the other hand several studies in diverse populations also advise a shared genetic risk. (3)

Alveolar septal solitary abode; squalid apoptosis may contribute to the pathogenesis of COPD Apoptosis offers in vascular endothelial and/or alveolar epithelial solitary abode; squalids in patients with COPD presenting emphyseinatous changes of the lung and is associated with reduc expression of vascular endothelial germination factor (VEGF) in the lung (45) VEGF receptor signaling is required for maintenance of the alveolar mode of buildings and withdrawal of VEGF leads to endothelial lonely dwelling apoptosis in vitro (6,7) and in vivo. (8) The los of endothelial lonely dwellings may be caused both according to loss of VEGF or a faulty VEGF signaling. (5)

Based forward these concepts, we hypothesized that a reduc ability of vascular endothelial and alveolar epithelial solitary abode; squalids to produce VEGF may be linked to the unravelling of COPD and emphysematous changes in the lung Cigarette smoking may act to decrease the expression of VEGF and its receptor 2 (KDR/Flk-1) A reduc ability to breed VEGF and/or a decreased expression of VEGF receptor 2 may lead to apoptosis of these small cavitys triggered by direct exposure to inhaled insults, of that kind as tobacco smoking, potentially contributing to the destruction of lung tissue observ in these patients.

It was reported (9) that there were three customary mutations in the 3' untranslated region (3'-UTR) of the VEGF gene; undivided of them, a cytosine (C) to thymine (T) substitution in the VEGF gene at position 936 in the 3'-UTR (the C allele was denoted as 1 and the T allele 2) VEGF936*2 was associated with significantly lower VEGF plasma flushs in healthy men. Regulating ingredients lie in the 3'-UTR of the VEGF gene where binding of hypoxia-induced proteins to mercury RNA occurs, resulting in a significantly increased half-life of emissary RNA. (10,11) This polymorphism may affect the binding of hypoxia-induced proteins to the VEGF harbinger RNA, decreasing thereby VEGF expression.

In this research the base composition at 936 of the VEGF gene was determined in patients with smoking-related COPD and brace control groups (a smoker command group and a population direction group) using the polymerase chain reaction (PCR)-restriction fragment long duration polymorphism technique. The purpose of the not away study was to determine whether VEGF936*1/2 polymorphism was associated with the nearness of smoking-related COPD.

MATERIALS AND METHODS

Subjects

The patients assemblage consisted of 113 patients with smoking-related COPD recruited from the Respiratory Outpatient Department, Chiba University Hospital and affiliated hospitals (Chiba, Japan). Sixty-nine men and 44 women were recruited to the COPD patient assemblage COPD was diagnosed on the basis of history, physical examination, and spirometric data, following the American Thoracic Society guidelines. (12) Pulmonary function examples were performed to determine FVC and FE[Vsub1] Chronic airflow obstruction was defined as an FE[Vsub1]/FVC ratio < 70% and an FE[Vsub1] < 80% of predicted values. enslaves were excluded if they had a history of productive cough for 3 month in each of 2 successive years (chronic bronchitis). The percentage ratio of the subdued attenuation area to the corresponding lung area was evaluated using a visual scoring plan for CT findings in 84 patients with COPD A significant correlation was observ between visual scores and FE[Vsub1]/FVC (r = 063 p < 001) (13)

...