Up-regulation of opiate receptors following chronic naloxone treatment in aged rats

Janet L. Neisewander; Arthur J. Nonneman; Sanders A. McDougall; Michael T. Bardo

doi:10.1016/S0197-4580(89)80011-9

Up-regulation of opiate receptors following chronic naloxone treatment in aged rats

Janet L. Neisewander
, Arthur J. Nonneman
, Sanders A. McDougall
, Michael T. Bardo

Producción científica: Article › revisión exhaustiva

11 Citas (Scopus)

Resumen

The present study assessed whether there are age-dependent differences in up-regulation of opiate receptors following chronic naloxone treatment in mature (3 months) and aged (27 months) male Wistar rats. Half of each age group were implanted subdermally with slow-release naloxone pellets for 10 days, and half were given sham surgery. Twenty-four hours after pellet removal, the rats were decapitated and various CNS areas including spinal cord, hindbrain, midbrain, diencephalon, hippocampus, striatum, olfactory tubercles/nucleus accumbens and prefrontal cortex were dissected and assayed for [³H]naloxone binding. The results indicated that aged rats had fewer opiate receptors in the spinal cord, midbrain, striatum, and olfactory tubercle/nucleus accumbens. Despite this age-related decline in opiate receptors, aged rats showed an up-regulation response similar to mature rats in all areas except the hippocampus of the left hemisphere, where they showed enhanced up-regulation relative to mature rats. The maintained plasticity of the opioid system contrasts with findings in other receptors systems where age-related impairments of antagonist-induced up-regulation have been reported.

Idioma original	English
Páginas (desde-hasta)	55-58
Número de páginas	4
Publicación	Neurobiology of Aging
Volumen	10
N.º	1
DOI	https://doi.org/10.1016/S0197-4580(89)80011-9
Estado	Published - 1989

Nota bibliográfica

Funding Information:
We gratefully acknowledge the excellent technical assistance of Lyn Ennis and the secretarial assistance of Jo Moore. We also thank Dr. Norman Pedigo for his helpful suggestions on our Scatchard analysis and his critique of this manuscript. This research was supported in part by USPHS grant DAO3460 and a Sigma Xi Grant-in-Aid. of Research.

Financiación

We gratefully acknowledge the excellent technical assistance of Lyn Ennis and the secretarial assistance of Jo Moore. We also thank Dr. Norman Pedigo for his helpful suggestions on our Scatchard analysis and his critique of this manuscript. This research was supported in part by USPHS grant DAO3460 and a Sigma Xi Grant-in-Aid. of Research.

Financiadores	Número del financiador
National Institute on Drug Abuse	R01DA003460
U.S. Public Health Service	DAO3460
Sigma-Aldrich

ASJC Scopus subject areas

General Neuroscience
Aging
Clinical Neurology
Developmental Biology
Geriatrics and Gerontology

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10.1016/S0197-4580(89)80011-9

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title = "Up-regulation of opiate receptors following chronic naloxone treatment in aged rats",

abstract = "The present study assessed whether there are age-dependent differences in up-regulation of opiate receptors following chronic naloxone treatment in mature (3 months) and aged (27 months) male Wistar rats. Half of each age group were implanted subdermally with slow-release naloxone pellets for 10 days, and half were given sham surgery. Twenty-four hours after pellet removal, the rats were decapitated and various CNS areas including spinal cord, hindbrain, midbrain, diencephalon, hippocampus, striatum, olfactory tubercles/nucleus accumbens and prefrontal cortex were dissected and assayed for [3H]naloxone binding. The results indicated that aged rats had fewer opiate receptors in the spinal cord, midbrain, striatum, and olfactory tubercle/nucleus accumbens. Despite this age-related decline in opiate receptors, aged rats showed an up-regulation response similar to mature rats in all areas except the hippocampus of the left hemisphere, where they showed enhanced up-regulation relative to mature rats. The maintained plasticity of the opioid system contrasts with findings in other receptors systems where age-related impairments of antagonist-induced up-regulation have been reported.",

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note = "Funding Information: We gratefully acknowledge the excellent technical assistance of Lyn Ennis and the secretarial assistance of Jo Moore. We also thank Dr. Norman Pedigo for his helpful suggestions on our Scatchard analysis and his critique of this manuscript. This research was supported in part by USPHS grant DAO3460 and a Sigma Xi Grant-in-Aid. of Research.",

year = "1989",

doi = "10.1016/S0197-4580(89)80011-9",

language = "English",

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AU - Neisewander, Janet L.

AU - Nonneman, Arthur J.

AU - McDougall, Sanders A.

AU - Bardo, Michael T.

N1 - Funding Information: We gratefully acknowledge the excellent technical assistance of Lyn Ennis and the secretarial assistance of Jo Moore. We also thank Dr. Norman Pedigo for his helpful suggestions on our Scatchard analysis and his critique of this manuscript. This research was supported in part by USPHS grant DAO3460 and a Sigma Xi Grant-in-Aid. of Research.

PY - 1989

Y1 - 1989

N2 - The present study assessed whether there are age-dependent differences in up-regulation of opiate receptors following chronic naloxone treatment in mature (3 months) and aged (27 months) male Wistar rats. Half of each age group were implanted subdermally with slow-release naloxone pellets for 10 days, and half were given sham surgery. Twenty-four hours after pellet removal, the rats were decapitated and various CNS areas including spinal cord, hindbrain, midbrain, diencephalon, hippocampus, striatum, olfactory tubercles/nucleus accumbens and prefrontal cortex were dissected and assayed for [3H]naloxone binding. The results indicated that aged rats had fewer opiate receptors in the spinal cord, midbrain, striatum, and olfactory tubercle/nucleus accumbens. Despite this age-related decline in opiate receptors, aged rats showed an up-regulation response similar to mature rats in all areas except the hippocampus of the left hemisphere, where they showed enhanced up-regulation relative to mature rats. The maintained plasticity of the opioid system contrasts with findings in other receptors systems where age-related impairments of antagonist-induced up-regulation have been reported.

AB - The present study assessed whether there are age-dependent differences in up-regulation of opiate receptors following chronic naloxone treatment in mature (3 months) and aged (27 months) male Wistar rats. Half of each age group were implanted subdermally with slow-release naloxone pellets for 10 days, and half were given sham surgery. Twenty-four hours after pellet removal, the rats were decapitated and various CNS areas including spinal cord, hindbrain, midbrain, diencephalon, hippocampus, striatum, olfactory tubercles/nucleus accumbens and prefrontal cortex were dissected and assayed for [3H]naloxone binding. The results indicated that aged rats had fewer opiate receptors in the spinal cord, midbrain, striatum, and olfactory tubercle/nucleus accumbens. Despite this age-related decline in opiate receptors, aged rats showed an up-regulation response similar to mature rats in all areas except the hippocampus of the left hemisphere, where they showed enhanced up-regulation relative to mature rats. The maintained plasticity of the opioid system contrasts with findings in other receptors systems where age-related impairments of antagonist-induced up-regulation have been reported.

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KW - Naloxone

KW - Opiate Receptors

KW - Receptor up-regulation

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Up-regulation of opiate receptors following chronic naloxone treatment in aged rats

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