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Primary Culture by Enzymatic Disaggregation

1. Department of Artificial Intelligence, Smart University of Medical Sciences, Tehran, Iran
2. Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
3. Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4. Toxicology and Poisoning Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran

Volume 1 Article ID:e0101

10.30699/jovm.001.e0101

Abstract

Primary cells are essential in cellular experiments because of their features, such as high biological relevance, original genome, and the best experimental models for in vivo studies. The primary culture originated with Wilhelm Roux's efforts, but it began in 1907 with Ross Harrison's experiments on frogs and the growing of neuron fibers. Enzymatic disaggregation is a helpful tool to separate cells from organs or tissues. This method is one of the three main disaggregation methods (fine dissection, enzymatic disaggregation, and mechanical disaggregation) that are used in primary culture. This study established a new enzymatic disaggregation method to harvest murine prostate cells by collagenase enzyme.

Highlights

Enzymatic disaggregation is a helpful tool to separate cells from organs or tissues. This method is one of the three main disaggregation methods (fine dissection, enzymatic disaggregation, and mechanical disaggregation) that are used in primary culture. In this study, we established a new enzymatic disaggregation method for prostate cells from the tissue by collagenase enzyme.

Full Text

Introduction
 


Cell culture's development significantly modified the biology science area and contributed to remarkable medical advancements. Wilhelm Roux used saline solution to maintain chicken embryos alive outside the egg for a few days in the 1800s; it was the first observation leading to cell culture development. Therefore, the basic principles of cell culture were raised (1-3). However, primary cell culture began in 1907, when Ross Harrison successfully used the hanging drop method to culture frog neurons (4). For this experiment, he applied small fragments of frog embryonic tissue immersed in a solution of lymph droplets on the cover slide. Then, he turned the plate, maintained the primary cell culture, and watched the growing neuron fibers (4, 5). Primary cells have advantages compared to cell lines; for example, they have high biological relevance, original genome, and the best experimental models for in vivo studies (6). Primary cells are taken directly from organs and tissues through fine dissection (Chopping down to explant size), enzymatic disaggregation, or mechanical disaggregation (e.g., sieving, syringing, or vigorous pipetting) and are considered primary until subculture (the first passage) (7, 8). Enzymatic Method has three disaggregation types: cold trypsin, warm trypsin, and collagenase (8). This study established a new enzymatic disaggregation method to harvest murine prostate cells by collagenase enzyme.
 

Protocol


1. Mouse prostate tissues were transferred to the cell culture lab in collection medium: Hanks buffer (Biowest, Nuaillé, France) or phosphate-buffered saline (PBS) supplemented with 10% penicillin-streptomycin (Biosera, East Sussex, UK) and 70 µl amphotericin B (2.5 mg/ml; Sigma, Germany).
2. Tissues were transferred to a Petri dish. After dissecting fat and necrotic tissues, samples were washed twice with PBS. The tissues were then chopped into 1 mm3 pieces with a sharp scalpel.
3. The chopped cubes were incubated in Hanks buffer with collagenase type I (100 U; Invitrogen, Massachusetts, USA) for two hours at 37 °C. The cells were dissociated by sampling up and down slowly every 15 min or incubation in a shaker incubator at 65 rpm.
4. Following incubation, the disaggregated tissue was passed through a 40 µm filter mesh with the medium. The suspension was centrifuged at 1700 rpm for 6 min to obtain single cells.
5. Cell pellet was resuspended in DMEM-F12 (Biowest) supplemented with 15% heat-inactivated Fetal Bovine Serum (FBS; Biowest) and 1% penicillin-streptomycin and propagated in a 25 cm2 tissue culture flask.
 

Results and Discussion


Two days post-seeding, the medium was changed. Cells isolated from prostate tissue by enzymatic and mechanical digestion methods were grown in 5% CO2 and 37 °C in DMEM-F12 medium containing 15% FBS and 1% Pen/Strep. After 5 days, the cells were observed with spindle-shaped morphology (Figure 1).
 

Figure 1. The spindle-shaped morphology of isolated primary cells after 5 days, magnification 10 X


Our study has some advantages and limitations; Enzymatic disaggregation is highly efficient when applying a suitable cell dissociation enzyme. This process provides a better yield than other methods when more tissue is available and yields a higher number of cells.
However, it is more time-consuming and can also unintentionally change cell surface marker (9, 10). For further investigation, the cells should be characterized e.g. immunophenotyping of selective biomarkers to validate the type of isolated cells (10-13).
 

Acknowledgment


The authors are grateful to the Faculty of Pharmacy, Tehran University of Medical Sciences for technical support.

 

Ethical Consideration


Not applicable.
 

Conflicts of Interest


The authors declare that they have no competing interests.

 

Funding


This research was supported under grant number 544 of Smart University of Medical Sciences.

References

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History

Receive Date: 17 August 2023

Revise Date: 27 November 2023

Accept Date: 12 December 2023

Publish Date: 21 January 2024

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