Table 3.
Impact of pretreatment of V. harveyi with catecholamines and catecholamine receptor antagonists on virulence of the bacterium toward gnotobiotic brine shrimp larvae.
Treatment | Survival (%)a |
---|---|
Control | 100 ± 0c |
V. harveyi | 50 ± 5b |
V. harveyi [50 μM NE] | 27 ± 6a |
V. harveyi [50 μM NE + 100 μM phentolamine] | 48 ± 3b |
V. harveyi [50 μM NE + 10 μM phenoxybenzamine] | 47 ± 3b |
V. harveyi [50 μM NE + 50 μM labetalol] | 48 ± 3b |
V. harveyi [50 μM NE + 100 μM propanolol] | 29 ± 4a |
V. harveyi [50 μM NE + 5 pM LED209] | 55 ± 5b |
V. harveyi [50 μM Dopa] | 35 ± 5a |
V. harveyi [50 μM Dopa + 50 μM chlorpromazine] | 47 ± 3b |
V. harveyi [50 μM Dopa + 5 pM LED209] | 52 ± 8b |
aSurvival after 2 days of challenge with V. harveyi ATCC BAA-1116 (average ± SE of four replicates). Survival in the control treatment was set at 100% and the other treatments were normalized accordingly. Square brackets refer to pretreatment – V. harveyi was either or not pretreated with catecholamines and antagonists for 4 h and washed prior to inoculation into the brine shrimp rearing water. Values with a different superscript letter are significantly different from each other (One way ANOVA with Tukey’s post hoc test; p < 0.01).