Zeta (ξ), a growth-related opioid receptor in developing rat cerebellum: identification and characterization

Research output: Contribution to journalArticle

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Abstract

Endogenous opioids and opioid receptors (i.e. endogenous opioid systems) are expressed during neural ontogeny, and play a role in the development of the nervous system. Using [3H][Met5]-enkephalin, a potent ligand involved in neural growth, particularly cell proliferation, specific and saturable binding was detected in homogenates of 6-day-old rat cerebellum; the data were consistent with a single binding site. Scatchard analysis yielded a binding affinity (Kd) of 2.2 nM and a binding capacity (Bmax) of 22.3 fmol/mg protein. Binding was linear with protein concentration, dependent on time, temperature, and pH, and was sensitive to Na+, Mg2+, and guanyl nucleotides. Optimal binding required protease inhibitors, and pretreatment of the homogenates with trypsin markedly reduced binding, suggesting that the binding site was proteinaceous in character. The [Met5]-enkephalin binding site was an integral membrane protein located in the nuclear fraction. Competition experiments indicated that [Met5]-enkephalin was the most potent displacer of [3H][Met5]-enkephalin, and that binding was stereospecific. In the adult rat cerebellum, non-opioid receptor binding of [3H][Met5]-enkephalin was recorded. μ and κ receptors were also found in the developing rat cerebellum, while μ, δ, and κ receptors were recorded in adult cerebellar tissue. The function, pharmacological and biochemical characteristics, subcellular distribution, and temporal expression of the [Met5]-enkephalin binding site suggest the presence of a unique opioid receptor, termed zeta (ξ), in the developing nervous system.

Original languageEnglish (US)
Pages (from-to)28-35
Number of pages8
JournalBrain research
Volume551
Issue number1-2
DOIs
StatePublished - Jun 14 1991

Fingerprint

Enkephalins
Opioid Receptors
Cerebellum
Growth
Binding Sites
Opioid Analgesics
Nervous System
Protease Inhibitors
Trypsin
Membrane Proteins
Proteins
Nucleotides
Cell Proliferation
Pharmacology
Ligands
Temperature

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

Cite this

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title = "Zeta (ξ), a growth-related opioid receptor in developing rat cerebellum: identification and characterization",
abstract = "Endogenous opioids and opioid receptors (i.e. endogenous opioid systems) are expressed during neural ontogeny, and play a role in the development of the nervous system. Using [3H][Met5]-enkephalin, a potent ligand involved in neural growth, particularly cell proliferation, specific and saturable binding was detected in homogenates of 6-day-old rat cerebellum; the data were consistent with a single binding site. Scatchard analysis yielded a binding affinity (Kd) of 2.2 nM and a binding capacity (Bmax) of 22.3 fmol/mg protein. Binding was linear with protein concentration, dependent on time, temperature, and pH, and was sensitive to Na+, Mg2+, and guanyl nucleotides. Optimal binding required protease inhibitors, and pretreatment of the homogenates with trypsin markedly reduced binding, suggesting that the binding site was proteinaceous in character. The [Met5]-enkephalin binding site was an integral membrane protein located in the nuclear fraction. Competition experiments indicated that [Met5]-enkephalin was the most potent displacer of [3H][Met5]-enkephalin, and that binding was stereospecific. In the adult rat cerebellum, non-opioid receptor binding of [3H][Met5]-enkephalin was recorded. μ and κ receptors were also found in the developing rat cerebellum, while μ, δ, and κ receptors were recorded in adult cerebellar tissue. The function, pharmacological and biochemical characteristics, subcellular distribution, and temporal expression of the [Met5]-enkephalin binding site suggest the presence of a unique opioid receptor, termed zeta (ξ), in the developing nervous system.",
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Zeta (ξ), a growth-related opioid receptor in developing rat cerebellum : identification and characterization. / Zagon, Ian; Gibo, Denise M.; McLaughlin, Patricia.

In: Brain research, Vol. 551, No. 1-2, 14.06.1991, p. 28-35.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Zeta (ξ), a growth-related opioid receptor in developing rat cerebellum

T2 - identification and characterization

AU - Zagon, Ian

AU - Gibo, Denise M.

AU - McLaughlin, Patricia

PY - 1991/6/14

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N2 - Endogenous opioids and opioid receptors (i.e. endogenous opioid systems) are expressed during neural ontogeny, and play a role in the development of the nervous system. Using [3H][Met5]-enkephalin, a potent ligand involved in neural growth, particularly cell proliferation, specific and saturable binding was detected in homogenates of 6-day-old rat cerebellum; the data were consistent with a single binding site. Scatchard analysis yielded a binding affinity (Kd) of 2.2 nM and a binding capacity (Bmax) of 22.3 fmol/mg protein. Binding was linear with protein concentration, dependent on time, temperature, and pH, and was sensitive to Na+, Mg2+, and guanyl nucleotides. Optimal binding required protease inhibitors, and pretreatment of the homogenates with trypsin markedly reduced binding, suggesting that the binding site was proteinaceous in character. The [Met5]-enkephalin binding site was an integral membrane protein located in the nuclear fraction. Competition experiments indicated that [Met5]-enkephalin was the most potent displacer of [3H][Met5]-enkephalin, and that binding was stereospecific. In the adult rat cerebellum, non-opioid receptor binding of [3H][Met5]-enkephalin was recorded. μ and κ receptors were also found in the developing rat cerebellum, while μ, δ, and κ receptors were recorded in adult cerebellar tissue. The function, pharmacological and biochemical characteristics, subcellular distribution, and temporal expression of the [Met5]-enkephalin binding site suggest the presence of a unique opioid receptor, termed zeta (ξ), in the developing nervous system.

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