ROLE OF MU-1-OPIOID AND DELTA-OPIOID RECEPTORS IN MODULATION OF FETAL EEG AND RESPIRATORY ACTIVITY

被引:27
作者
CHENG, PY
WU, DL
SOONG, Y
MCCABE, S
DECENA, JA
SZETO, HH
机构
来源
AMERICAN JOURNAL OF PHYSIOLOGY | 1993年 / 265卷 / 02期
关键词
MORPHINE; DELTORPHIN; ENDOGENOUS OPIOID PEPTIDES; FETAL BREATHING; NALOXONE; NALTRINDOLE; NALOXONAZINE; ENKEPHALIN;
D O I
10.1152/ajpregu.1993.265.2.R433
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Recent evidence suggests that administration of low doses of morphine causes respiratory stimulation, along with a more active electroencephalogram (EEG) in the fetal lamb. The present study used selective opioid agonists and antagonists to determine the role mu1- and delta-opioid receptor subtypes play in the response as well as determine if endogenous opioid peptides exert a tonic influence at the mu1- and delta-opioid receptors to maintain normal EEG and respiratory activity under control, physiological conditions. Both morphine (2.5 mg/h iv) and [D-Pen2, D-Pen5]enkephalin (DPDPE) (46 nmol/h icv) resulted in a significant activation of fetal EEG, which was blocked by naloxonazine (NALZ, mu1-opioid antagonist) and naltrindole (NTI, delta-opioid antagonist), respectively. Administration of NALZ alone, but not NTI, resulted in a slowing of the EEG. Morphine and [D-Ala2]deltorphin I (0.36 nmol/h icv) significantly increased breath number and were blocked by NALZ and NTI respectively. Both NALZ and NTI alone resulted in a reduction in breath number. These results suggest that the activation of the delta- or mu1-opioid receptors will stimulate fetal respiratory and EEG activity. Furthermore, the endogenous opioids play a tonic role at both the delta- and mu1-opioid receptors in the regulation of respiratory timing and EEG activity.
引用
收藏
页码:R433 / R438
页数:6
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