Abstract
Human β-endorphin produced a potent antinociceptive response as estimated by the tail-flick test in rats after intraventricular injection. On a molar basis, the peptide was 21 times more potent than morphine and in addition, the peptide produced morphine-like catatonia and hypothermia. These responses were blocked by naloxone. Repeated injections of the peptide induced tolerance to analgesic response, catatonia and hypothermia. Cross tolerance to morphine was also observed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 390-396 |
| Number of pages | 7 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 74 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 24 1977 |
Bibliographical note
Funding Information:by the National Institute of Drug (H.H.L.), and NIH Grant GM-2907 Institute of Mental Health Research
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