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Herz A, Millan MJ. Endogenous opioid peptides in the descending control of nociceptive responses of spinal dorsal horn neurons. PROGRESS IN BRAIN RESEARCH 1988; 77:263-73. [PMID: 3064171 DOI: 10.1016/s0079-6123(08)62794-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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The reinforcing but nonanalgesic action of opioid stimulation of the ventral tegmental area. Bull Exp Biol Med 1986. [DOI: 10.1007/bf00836197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Cardiovascular, respiratory and analgesic effects of fentanyl and naloxone were studied in normotensive acutely decerebrated dogs. Naloxone (1 mg/kg, i.v.) increased skin twitch reflex latency, mean blood pressure, pulse pressure, respiratory rate and minute volume. Fentanyl (50 micrograms/kg, i.v.) decreased heart rate and blood pressure while the animals were artificially ventilated. The skin twitch reflex latency was not significantly altered. Nine minutes later, naloxone (1 mg/kg, i.v.) was administered and the fentanyl-induced cardiovascular depression was reversed above the control level. The skin twitch reflex latency remained unchanged. These findings give further evidence that the endogenous opioid system plays an important role in the brainstem control of circulation and respiration. The mechanism of the anomalous analgesic response of the acutely decerebrated dog requires further investigation.
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Ignatov YD, Vasil'ev YN, Kovalenko VS, Titov MI. Effect of met- and leu-enkephalins and their synthetic analog on analgesia induced by stimulation and acupuncture. Bull Exp Biol Med 1981. [DOI: 10.1007/bf00829785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dafny N, Marchand J, McClung R, Salamy J, Sands S, Wachtendorf H, Burks TF. Effects of morphine on sensory-evoked responses recorded from central gray, reticular formation, thalamus, hypothalamus, limbic system, basal ganglia, dorsal raphe, locus ceruleus, and pineal body. J Neurosci Res 1980; 5:399-412. [PMID: 7441794 DOI: 10.1002/jnr.490050505] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Field potential recordings of acoustic and photic-evoked responses were obtained from 15 brain sites of freely behaving unanesthetized rats previously implanted stereotaxically with permanent electrodes. Several dosages of morphine (1, 5, 10, 30, and 50 mg/kg) were examined. The activities recorded from all the structures in this study, except the cochlear nucleus (CoN), were affected by morphine. Different sensitivities to morphine threshold were observed between structures, and several structures exhibited dose-related patterns (ventromedial hypothalamus (VMH), caudate nuucleus (CN), central gray (CG), hippocampus (Hipp), and lateral septum (Spt)). Several brain sites, after the initial dose of morphine, did not recruit more responses to subsequent doses of the drug, ie, exhibited all-or-none responses (pineal body (PB), medial thalamus (MTh), anterior hypothalamus (AH), mesencephalic reticular formation (MRF), and the dorsal raphe (DR)). In some structures, morphine induced increases in the response amplitudes, while in other sites decreases in response amplitudes were elicited. Biphasic responses, ie, increases in response amplitude after low doses of the drug and decreases in response amplitude after higher dosages, were also observed (VMH, CN, DR, CG, and MRF). The acoustic-evoked responses were affected by morphine more than the photic responses. The present observations indicated that 1) morphine exerts effects in many parts of the central nervous system (CNS); 2) some structures are more sensitive to morphine than others; 3) only a few structures exhibit dose-related patterns and, thus, may represent sites of direct morphine action; 4) some structures exhibit all-or-none responses; and 5) morphine depressed activity in some structures and increased activity in others, ie, morphine elicited different effects in different structures.
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Dickenson AH, Oliveras JL, Besson JM. Role of the nucleus raphe magnus in opiate analgesia as studied by the microinjection technique in the rat. Brain Res 1979; 170:95-111. [PMID: 223722 DOI: 10.1016/0006-8993(79)90943-0] [Citation(s) in RCA: 224] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The analgesic effects of morphine (5 microgram, 0.2 microliter) microinjected into the nucleus raphé magnus (NRM) and the surrounding reticular formation of the rat were tested using vocalization after electric shock to the tail as the test for analgesia. Only sites in the NRM produced powerful analgesic effects, strongest analgesia being equivalent to 3 mg/kg i.v. morphine. The analgesia produced by the microinjection was reversed by systemic naloxone. Pretreatment with systemic cinanserin, a blocker of serotonergic receptors, led to a pronounced diminution of the analgesic effects of the morphine. The effects of microinjections of naloxone (5 microgram 0.2 microliter) were studied for their effect on analgesia produced by systemic morphine. The analgesia following 3 mg/kg i.v. morphine was diminished by the microinjection of naloxone but the naloxone almost completely reversed the analgesic effects of 1.5 mg/kg i.v. morphine. These results further substantiate the role of the NRM in analgesic mechanisms.
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Mallari CG, Klemm WR. Morphine-induced regional and dose-response differences on unit impulse activity in decerebrate rats. Psychopharmacology (Berl) 1978; 56:261-7. [PMID: 418434 DOI: 10.1007/bf00432848] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Previous studies have indicated that morphine alters nerve impulse activity differently in various brain areas of intact animals. Because morphine has profound effects on visceral organs and on the spinal cord, cervically transected preparations, in which hypothermia was prevented, were used for recording spontaneous impulse activity before and for 30 min after morphine simultaneously from six regions of the brain: caudate (Cau), midbrain reticular formation (MBRF), central grey (CG), cingulate cortex (CC), hippocampus (Hip), and substantia nigra (SN). Morphine (5 and 15 mg/kg, i.p.) caused a naloxone-preventable depression of impulse activity in most brain areas. The depression was, however, especially pronounced in the CG, more so with the lower than the higher dose; naloxone completely blocked the low-dose effect. The MBRF responded with increased impulse activity after 5 mg/kg, but with depression after 15 mg/kg; naloxone blocked both responses. Activity in both the Hip and CC was depressed by the low dose of morphine, but not by the high dose; naloxone blocked the depression. Both doses of morphine generally depressed the variance in impulse activity, with a clear preferential depression of CG variance; naloxone blocked the CG variance effect, but not that of other brain areas.
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Yaksh TL, Rudy TA. Narcotic analgestics: CNS sites and mechanisms of action as revealed by intracerebral injection techniques. Pain 1978; 4:299-359. [PMID: 25403 DOI: 10.1016/0304-3959(77)90145-2] [Citation(s) in RCA: 554] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tony L Yaksh
- School of Pharmacy, University of Wisconsin, Madison, Wisc. 53706 U.S.A
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Lewis VA, Gebhart GF. Morphine-induced and stimulation-produced analgesias at coincident periaqueductal central gray loci: evaluation of analgesic congruence, tolerance, and cross-tolerance. Exp Neurol 1977; 57:934-55. [PMID: 923683 DOI: 10.1016/0014-4886(77)90119-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Bradley PB, Bramwell GJ. Stereoscpecific actions of morphine on single neurones in the brain stem of the rat. Neuropharmacology 1977; 16:519-26. [PMID: 917255 DOI: 10.1016/0028-3908(77)90011-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Laschka E, Herz A. Sites of action of morphine involved in the development of physical dependence in rats. III. Autoradiographic studies. Psychopharmacology (Berl) 1977; 53:33-7. [PMID: 196306 DOI: 10.1007/bf00426691] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Morphine withdrawal was precipitated by injection of 3H-naloxone into restricted parts of the ventricular system of rats made tolerant to and dependent on morphine by repeated pellet implantation. The spread of the drug was evaluated by autoradiography and compared with the withdrawal signs precipitated in the same experiment. When the antagonist could spread into the tissue surrounding the 4th ventricle and the caudal parts of the aqueduct (penetration depth about 1.5 mm), a strong withdrawal syndrome was displayed. In contrast, only weak or no withdrawal signs were observed when the spread of naloxone was restricted to the surroundings of the lateral ventricles, the 3rd ventricle, and the rostromedial parts of the aqueduct. The same was true when the spread of the antagonist was limited to the ventral surface of the brain stem. It is concluded that structures located in the anterior part of the fossa Rhomboidea, and possibly also in the caudal part of the periaqueductal grey matter, are sites for the development of physical dependence on morphine giving rise to the withdrawal signs studied in these experiments.
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Lewis VA, Gebhart GF. Evaluation of the periaqueductal central gray (PAG) as a morphine-specific locus of action and examination of morphine-induced and stimulation-produced analgesia at coincident PAG loci. Brain Res 1977; 124:283-303. [PMID: 191150 DOI: 10.1016/0006-8993(77)90886-1] [Citation(s) in RCA: 192] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Experiments were carried out in rats to (1) elaborate upon the sepcificity of drug action in the periaqueductal gray matter (PAG), and (2) to evaluate the posible congruence of PAG sites of morphine-induced and stimulation-produced analgesis (SPA) applied at virtually identical PAG loci. It was demonstrated that the effect of morphine intracerebrally (i,c.) administered into the PAG was not duplicated by other centrally acting agents (chlorpromazine, chlordiazepoxide, pentobarbital or naloxone) administered i.c. at the same PAG site. This selective action of morphine in the PAG was further demonstrated not to be test-bound since morphine significantly altered responding in all four of the analgesiometric tests employed. Thus, multiple i.c. injections of drugs at the same PAG locus were useful in demonstrating site specificity of drug action where behavioral and electroencephalographic methods alone had previously provided ambiguous information. Morphine-induced analgesia and SPA, evaluated at virtually coincident PAG sites, revealed only a general congruence of efficacious loci. The most effective PAG loci for morphine-induced analgesia were not the same as those for SPA; analgesia effected by one analgesia-producing manipulation did not reliably predict that analgesia would also be produced by the other analgesia-producing manipulation at the PAG sites examined. In general, the more efficacious analgesia-producing PAG loci were localized in the ventral-ventrolateral PAG.
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Basbaum AI, Marley NJE, O'Keefe J, Clanton CH. Reversal of morphine and stimulus-produced analgesia by subtotal spinal cord lesions. Pain 1977; 3:43-56. [PMID: 876666 DOI: 10.1016/0304-3959(77)90034-3] [Citation(s) in RCA: 253] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This study examined the hypothesis that descending inhibitory pathways from brain stem to spinal cord mediate the analgesic effect of both electrical brain stimulation and morphine. In the first set of experiments, the effect of subtotal midthoracic spinal cord lesions on the analgesic effect of electrical stimulation in the periaqueductal gray matter of the rat was examined. In the second, the effect of similar cord lesions on the analgesic effect of intraperitoneal morphine was studied. In both cases, a lesion of the dorsal part of the lateral funiculus (DLF) reduced or abolished the analgesia of the hindlimbs. Analgesia of the forelimbs was unaffected. Lesions of the dorsal columns, which include the corticospinal tract, or lesions of the ventral part of the lateral funiculus had no effect on analgesia. It is concluded that an inhibitory pathway, which descends in the dorsal part of the lateral funiculus and which probably originates in the nucleus raphe magnus of the medulla, mediates the descending control found in both morphine and stimulus-produced analgesia.
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Affiliation(s)
- Allan I Basbaum
- Departments of Neurology, Physiology, and Anatomy, University of California, San Francisco, Calif. 94143 U.S.A. Department of Anatomy, University College London, Gower Street, London WC1E 6BT Great Britain
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Sun CL, Gatipon GB. Effects of morphine sulfate on medical bulboreticular response to peripherally applied noxious stimuli. Exp Neurol 1976; 52:1-12. [PMID: 954902 DOI: 10.1016/0014-4886(76)90195-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Abstract
The roles played by the cerebral monoamines (dopamine, noradrenaline and serotonin) in stimulation-produced analgesia (SPA) have been investigated in the rat employing the tail flick test. SPA was elicited through bipolar electrodes chronically implanted in the mesencephalic periaqeductal gray matter, an area previously shown to yield potent and reliable analgesic effects. Four approaches were used to alter transmission in monoamine pathways. (1) Depletion of monoamines by administration of tetrabenazine (TBZ), p-chlorophenylalanine (PCPA), alpha-methyl-para-tyrosine (AMPT), or disulfiram. (2) Replacement of depleted monoamine stores by appropiate precursors (5-HTP or L-DOPA) in combination with a peripheral decarboxylase inhibitor. (3) Potentiation of monoamine systems by administration of precursors to previously untreated animals or by administration of a dopamine receptor stimulator, apomorphine. (4) Blockade of catecholamine receptors by haloperidol or of dopamine receptors by pimozide. These four approaches yielded internally consistent results. Depletion of all 3 monoamines (TBZ) led to a powerful inhibition of SPA. Original levels of SPA were restored by injection of either 5-HTP or L-DOPA. Specific depletion of serotonin (PCPA) caused a reduction in SPA, whereas elevation of serotonin levels (5-HTP) caused an increase in SPA. Dopamine receptor blockade (pimozide) decreased SPA, whereas the precursor (L-DOPA) and a dopamine receptor stimulator (apomorphine) increased SPA. On the other hand, selective depletion of noradrenaline (disulfiram) caused an increase in SPA; and at a time when noradrenaline levels are depressed and dopamine levels are elevated (AMPT + L-DOPA), SPA was seen to be particularly enhanced. thus, dopamine and serotonin appear to facilitate SPA, whereas noradrenaline appears to inhibit it. When a general catecholamine receptor blocker (haloperidol) was employed, SPA was diminished, suggesting that the influence of dopamine in SPA is greater than that of noradrenaline. Most of the drugs used in this study significantly altered SPA at doses which left baseline tail flick latency unaffected. It would appear, therefore, that SPA has a neural substrate at least partly independent of that underlying baseline pain responsiveness. Consideration is given to various ascending and descending monoamine system as possible component paths in this neural substrate of SPA. Finally, the present results are discussed in relation to studies by others on the site and mechanism of morphine's analgesic action. Some striking parallels between SPA and morphine analgesia are noted. These suggest the existence of a common pain-inhibitory system in the brain activated by morphine and by focal electrical stimulation.
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Bramwell GJ, Bradley PB. Actions and interactions of narcotic agonists and antagonists on brain stem neurones. Brain Res 1974; 73:167-70. [PMID: 4407395 DOI: 10.1016/0006-8993(74)91017-8] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Boakes RJ, Bramwell GJ, Briggs I, Candy JM, Tempesta E. Localization with Pontamine Sky Blue of neurones in the brainstem responding to microiontophoretically applied compounds. Neuropharmacology 1974; 13:475-9. [PMID: 4421851 DOI: 10.1016/0028-3908(74)90136-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Herz A, Bläsig J. [Neurobiologic aspects of the morphine addictions]. THE SCIENCE OF NATURE - NATURWISSENSCHAFTEN 1974; 61:223-8. [PMID: 4603708 DOI: 10.1007/bf00595654] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Lowney LI, Schulz K, Lowery PJ, Goldstein A. Partial purification of an opiate receptor from mouse brain. Science 1974; 183:749-53. [PMID: 4821242 DOI: 10.1126/science.183.4126.749] [Citation(s) in RCA: 77] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A proteolipid isolated from a lipid extract of mouse brain demonstrates stereospecific binding properties for levorphanol. It is present only in neuronal tissue and most abundant in the rhombencephalon. One component saturates at a concentration corresponding to maximum pharmacologic effect in vivo. The estimated mass is 60,000 daltons per bound opiate molecule.
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Vigouret J, Teschemacher H, Albus K, Herz A. Differentiation between spinal and supraspinal sites of action of morphine when inhibiting the hindleg flexor reflex in rabbits. Neuropharmacology 1973; 12:111-21. [PMID: 4787639 DOI: 10.1016/0028-3908(73)90081-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Herz A, Teschemacher H, Albus K, Zieglgänsberger S. Morphine abstinence syndrome in rabbits precipitated by injection of morphine antagonists into the ventricular system and restricted parts of it. Psychopharmacology (Berl) 1972; 26:219-35. [PMID: 4677798 DOI: 10.1007/bf00422698] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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