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The Temporal and Spatial Changes of Autophagy and PI3K Isoforms in Different Neural Cells After Hypoxia/Reoxygenation
Duo Zhang1, Xuanyu Chen2, Baoge Liu3
1Department of Orthopedics, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100070, China.
Abstract:
There are limited therapeutic options for patient with traumatic spinal cord injury (SCI). Phosphoinositide 3-kinase family (PI3Ks) are the key molecules for regulating cell autophagy, which is a possible way of treating SCI. As we know, PI3K family are composed of eight isoforms, which are distributed into three classes. While the role of PI3Ks in regulating autophagy is controversial and the effects may be in a cell-specific manner. Different isoforms do not distribute in neural cells consistently and it is not clear how the PI3K isoforms regulate and interact with autophagy. Therefore, we explored the distributions and expression of different PI3K isoforms in two key neural cells (PC12 cells and astrocytes). The results showed that the expression of LC3II/I and p62, which are the markers of autophagy, changed in different patterns in PC12 cells and astrocytes after hypoxia/reoxygenation injury (H/R). Furthermore, the mRNA level of eight PI3K isoforms did not change in the same way, and even for the same isoform the mRNA activities are different between PC12 cells and astrocytes. What is more, the results of western blot of PI3K isoforms after H/R were inconsistent with the relevant mRNA. Based on this study, the therapeutic effects of regulating autophagy on SCI are not confirmed definitely, and its molecular mechanisms may be related with different temporal and spatial patterns of activation and distributions of PI3K isoforms.
Insights
Therapeutic strategies for spinal cord injury (SCI) targeting autophagy are complex. This study reveals that Phosphoinositide 3-kinase (PI3K) isoforms exhibit varied expression and responses in neural cells, complicating their use in SCI treatment.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Traumatic spinal cord injury (SCI) has limited treatment options.
- Autophagy is a potential therapeutic target for SCI.
- Phosphoinositide 3-kinases (PI3Ks) regulate autophagy, but their role is controversial and cell-specific.
Purpose of the Study:
- To investigate the distribution and expression of PI3K isoforms in neural cells (PC12 and astrocytes).
- To understand how PI3K isoforms interact with autophagy regulation in the context of SCI.
- To clarify the cell-specific effects of PI3Ks on autophagy.
Main Methods:
- Examined autophagy markers (LC3II/I and p62) post-hypoxia/reoxygenation (H/R) injury.
- Analyzed mRNA levels of eight PI3K isoforms in PC12 cells and astrocytes.
- Assessed protein expression of PI3K isoforms using Western blot after H/R injury.
Main Results:
- Autophagy marker expression patterns differed between PC12 cells and astrocytes after H/R.
- mRNA levels of PI3K isoforms showed varied and cell-specific changes.
- Protein expression of PI3K isoforms did not consistently align with mRNA levels post-H/R.
Conclusions:
- The therapeutic potential of modulating autophagy for SCI is not definitively established.
- Molecular mechanisms underlying autophagy regulation in SCI may involve temporal and spatial variations in PI3K isoform activity and distribution.
