Effects of PACAP on morphologically identified myenteric neurons in guinea pig small bowel.
Effects of PACAP on morphologically identified myenteric neurons in guinea pig small bowel.
复制标题
PACAP 对豚鼠小肠形态学鉴定的肌间神经元的影响。
DOI:
10.1152/ajpgi.1993.264.3.g414
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发表时间:
1993
期刊:
影响因子:
--
通讯作者:
Wood,JD
中科院分区:
文献类型:
--
作者:
Christofi,FL;Wood,JD
Intracellular microelectrodes were used to examine the actions of pituitary adenylate cyclase-activating peptide (PACAP) on morphologically identified myenteric neurons and glial cells of the guinea pig small bowel. PACAP-27 and PACAP-38 evoked excitatory responses in 96% of after hyperpolarizing (AH)/type 2 neurons. The half-maximal concentration for PACAP-27 was 1.5 nM. The responses consisted of membrane depolarization in association with increased input resistance, suppression of hyperpolarizing afterpotentials, and repetitive spike discharge. Forskolin mimicked the action of PACAP in all AH/type 2 neurons. PACAP excited 36% of S/type 1 neurons. Most of the AH/type 2 neurons had Dogiel II morphology, whereas the S/type 1 neurons were uniaxonal with morphology characteristics of Dogiel I or filamentous neurons. No glial cells responded to PACAP. A selective A1 adenosine receptor agonist blocked the excitatory action of PACAP, and this was reversed by a selective A1 antagonist. The results suggest that excitatory PACAP receptors and inhibitory adenosine A1 receptors are linked to adenylate cyclase in AH/type 2 myenteric neurons.
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