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Mu opiate receptor subtypes.
1Neuroscience Research Institute, State University of New York, College at Old Westbury, Old Westbury, NY, U.S.A.
Summary
Two novel human mu-opiate receptor (MOR) splice variants, hMOR-1O and hMOR-1X, were identified in brain tissue. Their specific in vivo biological roles require further investigation.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- The human opiate receptor gene (MOR) generates at least 15 splice variants from 14 exons.
- Recent identification of two new variants, hMOR-1O and hMOR-1X, expands understanding of MOR gene expression.
Purpose of the Study:
- To characterize the novel human MOR splice variants hMOR-1O and hMOR-1X.
- To investigate the biochemical characteristics and potential function of the mu3 opiate receptor subtype.
Main Methods:
- Expression analysis of hMOR-1O and hMOR-1X in human brain tissue.
- Transfection studies to assess mu opioid binding selectivity.
- Molecular cloning and heterologous expression of the mu3 opiate receptor subtype.
Main Results:
- hMOR-1O and hMOR-1X contain human MOR exons 1, 2, and 3 with alternative exon O or X.
- These variants are expressed in human brain and show selective mu opioid binding.
- The mu3 clone, a novel splice variant, exhibits 100% identity to mu1 in conserved regions but has a truncated 5'-end and altered 3'-end.
- Expressed mu3 protein displays expected biochemical characteristics of the mu3 receptor.
Conclusions:
- The novel splice variants hMOR-1O and hMOR-1X are expressed in human brain tissue.
- The characterization of the mu3 receptor subtype provides evidence for morphinergic signaling in animals.
- Further research is needed to elucidate the in vivo biological roles of hMOR-1O and hMOR-1X.