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OCT4 protein and gene expression analysis in the differentiation of spermatogonia stem cells into neurons by immunohistochemistry, immunocytochemistry, and bioinformatics analysis

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Abstract

Background

Spermatogonia Stem Cells (SSCs) are potential candidates for reprogramming and regeneration. Recent studies have revealed that differentiated cells can be reverted to pluripotent by overexpressing a set of pluripotent transcription factors. OCT4 (encoded by pou5f1), a POU transcription factor family member, is essential to the potential that controls pluripotency, and it is widely expressed in pluripotent stem cells, although it decreased or suppressed after differentiation.

Methods

In this investigated research, we examined the OCT4 expression during the differentiation of SSCs into neurons (involving four stages in the following order: SSCs in vivo and in-vitro, embryonic Stem Cell-like (ES-like), Embryonic Bodies (EBs), and finally Neurons) by Immunocytochemistry (ICC), Immunohistochemistry (IMH), and Fluidigm Real-Time polymerase chain reaction. In addition, we use some databases like STRING to predict protein–protein interaction and enrichment analysis.

Results

We evaluated the expression of OCT4 in this process, and we observed that it is expressed in SSCs, ES-like, and EBs during the differentiation of spermatogonia stem cells into adult neurons. We show that by adding RA to EBs, the expression of OCT4 is reduced and is not expressed in the neuron cells. We observed that the expression of OCT4 is linked and interacts with the differentiation of spermatogonia stem cells into neuron cells, and it has been shown to be biologically functional, like stem cell maintenance and somatic cell reprogramming.

Conclusion

Our findings can help us better understand the process of differentiation of spermatogonia stem cells into neurons, and it can be effective in finding new and more efficient treatments for neurogenesis and repair of neurons.

Graphical Abstract

We examined the OCT4 expression during the differentiation of SSCs into neurons (involving four stages in the following order: SSCs in vivo and in-vitro, embryonic Stem Cell-like (ES-like), Embryonic Bodies (EBs), and finally Neurons) by Immunocytochemistry (ICC), Immunohistochemistry (IMH), and Fluidigm Real-Time polymerase chain reaction. In addition, we use some databases like STRING to predict protein–protein interaction and enrichment analysis. We evaluated the expression of OCT4 in this process, and we observed that it is expressed in SSCs, ES-like, and EBs during the differentiation of spermatogonia stem cells into adult neurons. We show that by adding RA to EBs, the expression of OCT4 is reduced and is not expressed in the neuron cells. We observed that the expression of OCT4 is linked and interacts with the differentiation of spermatogonia stem cells into neuron cells, and it has been shown to be biologically functional, like stem cell maintenance and somatic cell reprogramming.

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Data availability

All data generated or analyzed during this study are available from the corresponding author on reasonable request.

Abbreviations

SSCs:

Spermatogonia Stem Cells

ICC:

Immunocytochemistry

IHC:

Immunohistochemistry

ES-Like:

Embryonic Stem Cell-like

EBs:

Embryoid bodies

iPSCs:

Induced pluripotent stem cells

PPI:

Protein–protein interactions

RA:

Retinoic acid

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Acknowledgements

This research was supported by Amol University of Special Modern Technologies (AUSMT) and the University of Heidelberg, Institute for Anatomy and Cell Biology III, Department of Neuroanatomy, Germany.

Funding

This research was funded by Centre for International Scientific Studies and Collaboration (CISSC), Ministry of Science, Research and Technology, and a BMBF grant (01DS13003). This research has been done with the financial support of the Centre for International Scientific Studies and Collaboration (CISSC) of the Ministry of Science, Research and Technology as well as the Iranian National Science Foundation (INSF) under project No.4006239, and a memorandum of understanding (MOU) agreement between the Institute for Anatomy and Cell Biology at the University of Heidelberg and Amol University of Special Modern Technology.

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H.A: Carried out and designed the experiment and edited the manuscript, and D.H.K: Assembly of data, do the experiment, data analysis, design PPI network, and enrichment analysis, wrote and edited the manuscript.

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Correspondence to Hossein Azizi.

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All animal use was approved by University of Heidelberg and Amol Research Ethics Office and experiments were conducted in accordance with the Iranian Council of Animal Care Policies.

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Hashemi Karoii, D., Azizi, H. OCT4 protein and gene expression analysis in the differentiation of spermatogonia stem cells into neurons by immunohistochemistry, immunocytochemistry, and bioinformatics analysis. Stem Cell Rev and Rep 19, 1828–1844 (2023). https://doi.org/10.1007/s12015-023-10548-8

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