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Determination of The Properties of Rat Brain Thermostable Protein Complex which Inhibit Cell Proliferation
Diana Dzidziguri1, Irina Modebadze1, Ekaterine Bakuradze1
1Department of Biology, Faculty of Exact and Natural Sciences, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia.
Objectives:
Cell proliferation is known to be controlled by many networks of regulatory proteins. These multiple and complicated mechanisms of control are still being investigated. The aim of the present study is to determine the different properties of adult rat brain thermostable protein complex (TPC) which affect cell proliferation.
Materials And Methods:
This experimental study used brain, kidney and liver tissue from adult (150-170 g) and adolescent (7, 10, 21, 28 days) white rats, adult pigeons and mice. Brain TPC was isolated by alcohol extraction, and primary antibodies Ki67 and GAD65/67 were used for immunohistochemistry, evaluation of transcriptional activity of the tissues and determination of the mitotic index.
Results:
The results show that brain TPC from rats reversibly decreases cell proliferation by inhibiting transcription. The evidence suggests that TPC is not species-specific, but expresses tissue specificity with regards to terminally differentiated cells. Rat brain TPC inhibits mitotic activity of the progenitor cells in the dentate gyrus of adolescent rats, and corresponding with this decrease in the mitotic index the number of Ki67 positive cells increases. Simultaneously, the number of GAD65/67-positive cells in the hippocampus decreases by approximately threefold.
Conclusions:
These results indicate that rat brain TPC causes the reversible suppression of cell proliferation through the inhibition of transcription. Inhibitory effects of rat brain TPC leads to an increase the number of cells in the cell cycle, in tissues of adolescent rats.
Insights
Adult rat brain thermostable protein complex (TPC) reversibly inhibits cell proliferation by suppressing transcription. This protein complex impacts progenitor cell activity and cell cycle dynamics in developing rat brains.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Cell proliferation is regulated by complex protein networks.
- Mechanisms controlling cell proliferation are under ongoing investigation.
- Thermostable protein complex (TPC) role in cell proliferation requires further elucidation.
Purpose of the Study:
- To investigate the properties of adult rat brain thermostable protein complex (TPC).
- To determine the effects of rat brain TPC on cell proliferation.
- To understand the molecular mechanisms underlying TPC's influence on cell division.
Main Methods:
- Utilized brain, kidney, and liver tissues from rats of various ages, pigeons, and mice.
- Isolated brain TPC via alcohol extraction.
- Employed immunohistochemistry with Ki67 and GAD65/67 antibodies, transcriptional activity assays, and mitotic index determination.
Main Results:
- Rat brain TPC was found to reversibly decrease cell proliferation by inhibiting transcription.
- TPC demonstrated tissue specificity, particularly in terminally differentiated cells, and was not species-specific.
- TPC inhibited progenitor cell mitotic activity in the dentate gyrus, increasing Ki67-positive cells and decreasing GAD65/67-positive cells in the hippocampus.
Conclusions:
- Rat brain TPC reversibly suppresses cell proliferation through transcriptional inhibition.
- TPC's inhibitory effects lead to an increased number of cells in the cell cycle in adolescent rat tissues.
