Dynamic pulmonary hyperinflation and low grade systemic inflammation in stable COPD patients.

BACKGROUND AND OBJECTIVES: It is increasingly recognized that a low grade of systemic inflammation occurs in patients with advanced chronic obstructive pulmonary disease (COPD). C-reactive protein (CRP), a marker of systemic chronic inflammatory response, has been related with decreased survival in large cohorts of COPD patients. The aim of the study was to assess if resting dynamic pulmonary hyperinflation (DH) is linked to the presence of systemic inflammation in COPD. MATERIALS AND METHODS: In a 12-month retrospective study involving 55 out-patients with COPD (FEV1 59+/- 23% pred.) examined in stable conditions, inspiratory capacity (IC) was measured at rest and considered as index of DH when lower than 80% predicted. Simultaneously, CRP (by immuno-turbidometry) and white blood cells (WBC), uric acid and alpha-1 globulins were measured in the venous blood in the morning before eating. RESULTS: CRP was significantly increased in the COPD patients with IC < 80% pred. (n = 35; IC = 61 + 14% pred.) as compared with that measured in COPD patients with IC > 80% pred. (n = 20; IC = 97 + 13% pred.), amounting to 0.70 +/- 0.59 vs 0.29 +/- 0.28 mg/dl, respectively (p < 0.01). CRP was inversely related to IC (% pred.) (r = 0.45, p < 0.01). WBC, serum uric acid (an endogenous danger signal), and albumin and alfa-1 globulins were not different between the two groups. DISCUSSION: These results show that the IC reduction is associated with higher serum levels of CRP in stable COPD patients, suggesting a potential role of dynamic pulmonary hyperinflation on development and maintenance of low grade systemic inflammation in COPD.

Monitoring airborne genotoxicants in the rubber industry using genotoxicity tests and chemical analyses.

This research was designed to examine the presence of mutagenic/carcinogenic compounds in airborne pollutants in the rubber industry using an integrated chemical/biological approach. Inhalable airborne particulate matter (PM-10: <10 microm) was collected in four rubber factories using a high-volume sampler equipped with a cascade impactor for particle fractionation. The organic extracts of two different fractions (0.5-10 microm and <0.5 microm) were examined for mutagenicity with the Ames test and for in vitro DNA-damaging activity in human leukocytes by single-cell microgel electrophoresis (Comet assay). The extracts were also studied by gas chromatography/mass spectrometry (GC/MS) for polycyclic aromatic hydrocarbon (PAH) content. Nitrosamines in ambient air were sampled on cartridges and analysed by GC with a thermal energy analyser (TEA) detector. Airborne volatile genotoxins were monitored in situ using a clastogenicity plant test (Tradescantia/micronuclei test). The results showed that airborne particulates were mainly very fine (<0.5 microm) and that trace amounts of genotoxic nitrosamines (N-nitrosodimethylamine: 0.10-0.98 microg/m(3); N-nitrosomorpholine: 0.77-2.40 microg/m(3)) and PAH (total PAH: 0.34-11.35 microg/m(3)) were present in air samples. Some extracts, particularly those obtained from the finest fractions, were mutagenic with the Ames test and genotoxic with the Comet assay. In situ monitoring of volatile mutagens using the Tradescantia/micronuclei test gave positive results in two working environments. The results showed the applicability of this integrated chemical-biological approach for detecting volatile and non-volatile genotoxins and for monitoring genotoxic hazards in the rubber industry.

Monitoring of mutagens in urban air samples.

This research was designed to examine the presence of mutagenic/carcinogenic compounds in urban airborne particulates sampled with the inhalable PM-10 high volume sampler in two different streets of Brescia, a heavily industrialized town in northern Italy, using the Tradescantia/micronucleus test and a bacterial mutagenicity test (Kado test, a more sensitive version of the Ames test). In addition, the Tradescantia/micronucleus test was used for in situ monitoring of gaseous pollutants in other urban areas of Brescia and in two car tunnels, one with heavy car traffic in Perugia, a town in central Italy, and one in Brescia with moderate traffic. The Tradescantia-micronucleus test carried out on extracts of airborne particulates gave positive results only for the sample collected in the traffic-congested street where also higher bacterial mutagenicity was found. The in situ monitoring of the urban areas with the Tradescantia/micronucleus test always gave negative results. Monitoring carried out in the two car tunnels showed a significant increase in micronuclei frequency only in flowers exposed in the smaller and more polluted tunnel.

Mutagenicity and clastogenicity of gas stove emissions in bacterial and plant tests.

The aim of this research was to study the gaseous and particulate emissions of genotoxic substances during cooking with two types of methane stoves (a new one and an old one). The particulates were sampled both with a cascade impactor air sampler and an impinger with ice trap and analyzed by two bacterial mutagenicity tests (Ames and Kado tests) and by HPLC for polycyclic aromatic hydrocarbons (PAH). Gaseous emissions were studied in situ using the Ames test, a clastogenicity plant test (Tradescantia-micronucleus test), and in an automated system for chemical analyses. Clear indirect mutagenicity was found only with the Kado test (TA98-S9) in extracts of particulates emitted from the old methane stove and collected with the impinger. Similar mutagenicity (TA98+S9) was also found for the finest fraction of particulates (<0.5 um) collected from both stoves. Gaseous emissions of both stoves caused clastogenicity in the in situ experiments with the Tradescantia-micronucleus test. The physico-chemical analyses of the emissions showed also the presence of very fine particulates and trace amounts of PAH. The exposure of these genotoxins could be particularly important for occupationally exposed individuals in homes and businesses and for susceptible subjects living indoors for long periods (infants, children, the sick, and the elderly).

Mutagens and carcinogens in size-classified air particulates of a northern Italian town.

This research was designed to examine the presence of mutagenic/carcinogenic compounds in urban airborne particulate matter in relation to particles aerodynamic size. Inhalable (< 10 microns) airborne particulate (PM-10) was collected at a low traffic site in an industrialized Northern Italian town, using a high volume sampler equipped with a cascade impactor for particles fractionation. The organic extracts of different fractions were examined for mutagenicity in Salmonella typhimurium strains TA98 and TA98/1,8-DNP6 using the microsuspension procedure, and for polycyclic aromatic hydrocarbons (PAHs) content by gas chromatography. Size fractionated particles were also analysed for heavy metals (Fe, Mn, Zn, Pb, Cu, Cd, Cr, Ni, V) using plasma spectrophotometry. The results of mutagenicity and chemical analyses indicate that, at the site investigated, inhalable particulate was largely made of fine (< 0.5 micron) particles, which accounted for most of PAHs and mutagenicity. A similar pattern of distribution was found for heavy metals, which were relatively more abundant in small (< 1.5 microns) particles compared to coarser ones.

[Evaluation of a health education program for preventing alcohol and tobacco abuse in a health unit in Lombardi, Italy]. / Risultati di un intervento di prevenzione dell'abuso di alcol e tabacco in una USSL della Lombardia.

The effectiveness of a health education programme for prevention of alcohol abuse and tobacco smoking among adolescents was assessed by an intervention study with a non-randomized control group. The study was carried out among 7th-9th grade school students in a Local Health Unit of the Brescia province, North Italy. Students were enrolled in either the intervention or the control group, based on the participation of their teachers to the educational programme. A total of 428 students were involved in the programme representing the intervention group, and 658 students not involved in the programme formed the control group. The health education programme included the prevention of alcohol abuse in the first school year (1989-90) and the prevention of tobacco smoking in the second year (1990-91). Each part of the programme included a series of lessons taken by the teachers for about 20 hours. Alcohol use and smoking habits, knowledge about, and attitudes toward alcohol and tobacco use of the students have been assessed by anonymous questionnaires. The questionnaires have been administered during school time at the beginning and the end of each school year, giving a total of 6 questionnaires, from Q1 to Q6. All the questionnaires included the same questions on alcohol and tobacco use, knowledge and attitudes. Of the 1086 students who attended the 7th grade in the year 1989-90, 428 were enrolled as intervention group and 658 as control group. As regards alcohol, the following findings were observed: 1. no difference was found in the percentages of students drinking at least one glass of wine or beer daily between the 2 groups at Q6; 2. no substantial change in the percentage of students aware of the health risks of alcohol abuse from Q1 to Q6 was observed. As regards tobacco smoking, the results of the study showed: 1. no difference between the 2 groups was found at Q6 as regards the proportion of students who smoked one or more cigarettes a month; 2. the percentages of students planning to smoke in the future were similar in the 2 groups in Q6; 3.the percentage of students with a high score on the health consequences of smoking was higher in the intervention than the control group at Q4, but again no difference between the groups was evident at Q6. In conclusion, the health education programme seemed to be unsuccessful in modifying behaviors and attitudes regarding alcohol and tobacco use during the 3-year follow-up.

Studies of migration of potentially genotoxic compounds into water stored in pet bottles.

Coloured polyethylene terephthalate (PET) bottles for carbonated beverages were studied for potential migration of genotoxic compounds. A combined approach, using physicochemical methods and a bacterial short-term mutagenicity test (Ames test) was followed. Standard EEC and US FDA tests for total migration of non-volatile migrant compounds into distilled water were performed, together with modified tests, where freeze-drying instead of evaporation of water was used, in order to measure both volatile and non-volatile chemicals. Gas chromatography-mass spectrometry (GC-MS) analysis was performed on these residues. PET bottles filled with naturally carbonated mineral water were also used for long-term total organic carbon (TOC) and mutagenicity migration studies (up to 6 months' storage). Total migration results for PET bottles were within the EEC and US FDA limits. The use of freeze-drying for the elimination of water enabled much higher total migration data (higher than the limits) to be revealed. Some potentially genotoxic compounds (acetaldehyde, dimethyl terephthalate, terephthalic acid) were identified in these migrant compounds by GC-MS analysis. The tests for TOC migration gave a maximum value after 2 wk storage and the mutagenicity tests on non-volatile migrant compounds gave always negative results.