Article date: August 1980
By: J.R. BEDWANI, SIAN E. HILL, in Volume 69, Issue 4, pages 609-614
Investigations were made into the effects of prostaglandins D2 (PGD2) and F2α (PGF2α) on the responses of the rat anococcygeus muscle to field stimulation of intrinsic motor (sympathetic) and inhibitory nerves, and to exogenous noradrenaline.
PGD2 (2.8 × 10−6 mol/1) substantially increased the motor responses to field stimulation at all frequencies tested (2 to 32 Hz), and caused a smaller increase in the responses to noradrenaline.
PGF2α (2.8 × 10−6 mol/1) strongly potentiated the motor responses to field stimulation (2 to 32 Hz) and also to noradrenaline. This prostaglandin had quantitatively similar effects on the responses to both types of stimulus.
PGD2 was without effect on the inhibitory responses evoked by field stimulation in the presence of guanethidine. PGF2α seemed to reduce the inhibitory responses to low frequencies of stimulation (0.5 to 1.5 Hz), but this effect was marginal.
The results suggest that PGD2 facilitates sympathetic neurotransmission in this tissue by both pre‐ and post‐junctional actions. The effect of PGF2α seems likely to be mediated predominantly post‐junctionally.
Investigations were made into the effects of prostaglandins D2 (PGD2) and F2α (PGF2α) on the responses of the rat anococcygeus muscle to field stimulation of intrinsic motor (sympathetic) and inhibitory nerves, and to exogenous noradrenaline.
PGD2 (2.8 × 10−6 mol/1) substantially increased the motor responses to field stimulation at all frequencies tested (2 to 32 Hz), and caused a smaller increase in the responses to noradrenaline.
PGF2α (2.8 × 10−6 mol/1) strongly potentiated the motor responses to field stimulation (2 to 32 Hz) and also to noradrenaline. This prostaglandin had quantitatively similar effects on the responses to both types of stimulus.
PGD2 was without effect on the inhibitory responses evoked by field stimulation in the presence of guanethidine. PGF2α seemed to reduce the inhibitory responses to low frequencies of stimulation (0.5 to 1.5 Hz), but this effect was marginal.
The results suggest that PGD2 facilitates sympathetic neurotransmission in this tissue by both pre‐ and post‐junctional actions. The effect of PGF2α seems likely to be mediated predominantly post‐junctionally.
DOI: 10.1111/j.1476-5381.1980.tb07911.x
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