To investigate the mechanism of action by which ethanol root extract of Equisetum arvense
influences urinary bladder activity in rats, and to characterize the major compounds of the extract.
Ethanol (95%) was used for hot extraction for 3 h in a Soxhlet extraction apparatus. A total of
36 female rats were divided into Equisetum arvense
root extract-treated group (EA) and control group.
Rats in EA group were treated with a standard diet containing 0.2 % of the extract, while rats in the
control group were fed with the diet only. After 3 weeks, 12 rats underwent cystometry with 0.2 % acetic
acid solution and bladder activity was recorded. In another 12 rats, blood pressure, body weight and
adenosine triphosphate were measured. In the remaining 12 rats, 0.2 % acetic acid solution was infused
into the bladder and urinary adenosine triphosphate determined before and after the stimulation.
The results showed that during cystometry with acetic acid, the time interval between urinary
bladder contractions was shorter and maximum bladder contraction pressure was much greater in rats
in the control group, but in the Equisetum arvense
group, the changes were much lower. Also in the
group, plasma adrenaline and noradrenaline levels were lower than for the control
group. Furthermore, increase in the levels of urinary adenosine triphosphate was smaller in Equisetum
group than in control group.
This study suggests that Equisetum arvense
ethanol root extract influences urinary
bladder activity by decreasing adenosine triphosphate release, and is therefore a potential therapeutic
agent against bladder disorder. However, there is need for further investigation of its exact mechanism