Identification of Cigarette Smoke Components: RESULTS(1)

RESULTS(1)

Effect of Individual Smoke Constituents on CBF

For each infundibulum, CBF was first recorded in control medium (EBSS-H); then the lowest concentration of test solution was introduced into the perfusion chamber, and beat frequency was again recorded. This procedure was continued using the next increasing concentration of test solution until all concentrations had been tested. The chamber was then flushed with EBSS-H alone (washout) to determine whether CBF would return to control values. The beat frequency of hamster oviductal cilia in control medium (EBSS-H) averages 6-7 Hz at room temperature. In comparison to CBF of controls, 1.78 mM acrolein significantly inhibited CBF {p < 0.001), and beat frequency continued to decrease during the washout phase of the experiment (Fig. 1). Acrolein concentration was measured in the six types of smoke solution and ranged from 36 to 267 (jtM (Table 1). The concentration of acrolein that inhibited CBF in vitro was 7- to 50-fold more than the concentration of acrolein in MS and SS smoke solutions. buy asthma inhaler

Figure 2 shows that 1.66 mM formaldehyde significantly inhibited CBF as compared to control readings in EBSS-H {p < 0.01). In contrast to the effect of acrolein, beat frequency partially recovered following washout, but had not returned to control values at 30 min after washout. Smoke solutions have formaldehyde concentrations ranging from 50 to 249 |xM (Table 1); these concentrations are 3-17 times lower than the concentration required to inhibit CBF in vitro. Acetaldehyde, like formaldehyde, produced a dose-dependent decrease in CBF; however, a significant decrease was not observed until 45 mM was used (not shown).
TABLE 1. Concentrations of ciliotoxic agents in various types of smoke.’
Table1Identification of cigarette
“ The concentrations of ciliotoxic agents in mainstream whole (MSW), mainstream particulate (MSP), mainstream gas (MSG), sidestream whole (SSW), sidestream particulate (SSP), and sidestream gas (SSG) smoke solutions are reported as the means ± standard deviation of measurements made on four different batches of smoke solution.

Fig1Identification of cigarette
FIG. 1. The effect of acrolein on CBF. CBF is plotted for incubations in control medium (EBSS-H), three concentrations of acrolein, and washout medium (EBSS-H). A concentration of 1.78 mM acrolein significantly inhibited CBF as compared to control values in EBSS-H alone (p < 0.01). Beat frequency continued to decrease after washout and remained significantly lower than in the EBSS-H control group (p < 0.01). Values indicated by * (p < 0.05) and ** (p < 0.01) are significantly different from those of the EBSS-H control. Each bar is the mean ± SD of four experiments.

This entry was posted in Cigarette Smoke and tagged Cigarette Smoke, Functioning of Hamster, Oviducts.