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Antisense knockout of a neuropeptide gene reduces fibroblast proliferation
G Weisinger1, O Zinder, R Simantov
1Dep. of Clinical Biochem., Technion Faculty of Med., Haifa, Israel.
Abstract:
The opioid peptides enkephalins are widely expressed throughout the body. While their role in the nervous system is well characterized, their function in other tissues is unclear. The antisense knockout approach was used to investigate the involvement of proenkephalin A gene in proliferation of cultured embryonic fibroblasts. Transfection of fibroblasts with enkephalin antisense vectors reduced [3H] thymidine incorporation and fibroblast colony growth. Moreover, FACS analysis indicated that transient or stable transfection with the enkephalin antisense vectors shifted fibroblasts from their normal G1 restriction point to one in the S-phase.
Insights
Enkephalins, opioid peptides, are involved in fibroblast proliferation. Targeting the proenkephalin A gene with antisense vectors inhibited cell growth and altered cell cycle progression in embryonic fibroblasts.
Area of Science:
- Molecular Biology
- Cell Biology
- Neuroscience
Background:
- Opioid peptides, specifically enkephalins, are widely distributed in the body.
- The functions of enkephalins outside the nervous system are not well understood.
- Investigating the role of proenkephalin A in non-neuronal tissues is crucial.
Purpose of the Study:
- To investigate the role of the proenkephalin A gene in the proliferation of cultured embryonic fibroblasts.
- To determine if enkephalins influence fibroblast cell cycle progression.
Main Methods:
- Utilized an antisense knockout approach to reduce proenkephalin A gene expression.
- Employed [3H] thymidine incorporation assays to measure DNA synthesis.
- Performed fibroblast colony growth assays to assess proliferation.
- Used Fluorescence-Activated Cell Sorting (FACS) analysis to examine cell cycle distribution.
Main Results:
- Transfection with enkephalin antisense vectors significantly reduced [3H] thymidine incorporation.
- Fibroblast colony growth was inhibited following antisense vector transfection.
- FACS analysis revealed a shift in the cell cycle from the G1 restriction point to the S-phase in transfected fibroblasts.
Conclusions:
- The proenkephalin A gene and its encoded peptides play a role in regulating embryonic fibroblast proliferation.
- Enkephalins influence the cell cycle progression of fibroblasts, specifically affecting the G1/S transition.
- These findings suggest novel functions for enkephalins in peripheral tissues beyond their established roles in the nervous system.