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In vitro model using cytokine cocktail to evaluate apoptosis in Min6 pancreatic beta cells
Hemangee H Damame1, Sheetalnath B Rooge1, Rahul S Patil1
1Department of Biochemistry, Shivaji University, Kolhapur 416 004, Maharashtra, India.
Introduction:
Development of therapy options for treatment of type 1 diabetes mellitus is hampered by non-availability of appropriate experimental models that can exactly mimic the in vivo situation. Apoptosis of beta cells by T cells and cytokine action leads to loss of beta cells. We propose a simple and elegant model using cytokine cocktail of TNF-α, IFN-γ and IL-1β, the major cytokines responsible for apoptosis in Min6 beta cell line.
Methods:
A cocktail of TNF-α, IFN-γ and IL-1β was used to induce apoptosis in Min6 beta cell line. Apoptosis was assessed by flow cytometry using CytoFLEX (Beckman Coulter). The destruction of beta cells is through production of nitric oxide (NO), oxidative stress and change in mitochondrial membrane permeability. NO was measured using Griess reagent. Oxidative stress was assessed using 2',7'-dichlorofluorescein diacetate, a cell-permeable fluorogenic dye and mitochondrial membrane potential was determined on the basis of retention of rhodamine 123 using flow cytometer.
Results And Discussion:
Very low concentration of the cocktail viz. TNF-α 25 ng/ml, IFN-γ 25 ng/ml and IL-1β 50 ng/ml has demonstrated effective early and late apoptosis in as short a time period as 6 h. The experimental model used demonstrated 1.5 fold higher production of NO, 1.2 fold increased oxidative stress and lower mitochondrial membrane potential as compared to the positive control used. Hence the above model can be easily used for assessment and screening of drugs that can prevent apoptosis of beta cells and stop progression of type 1 diabetes.
Insights
A novel experimental model using a cytokine cocktail effectively induces beta cell apoptosis in type 1 diabetes research. This model aids in screening drugs to prevent beta cell death and halt disease progression.
Area of Science:
- Immunology
- Endocrinology
- Cell Biology
Background:
- Type 1 diabetes mellitus (T1DM) therapy development is hindered by a lack of suitable in vivo models.
- Beta cell loss in T1DM is primarily caused by T cell-mediated apoptosis induced by cytokines.
- This study introduces a novel experimental model using a specific cytokine cocktail to mimic T1DM-induced beta cell apoptosis.
Purpose of the Study:
- To develop and validate a simple, elegant experimental model for inducing apoptosis in Min6 beta cells.
- To utilize this model for assessing the effects of key diabetogenic cytokines: tumor necrosis factor-alpha (TNF-α), interferon-gamma (IFN-γ), and interleukin-1 beta (IL-1β).
- To establish a platform for screening potential therapeutic agents aimed at preventing beta cell apoptosis.
Main Methods:
- Min6 beta cell line was treated with a cocktail of TNF-α, IFN-γ, and IL-1β to induce apoptosis.
- Apoptosis was quantified using flow cytometry.
- Nitric oxide (NO) production, oxidative stress levels, and mitochondrial membrane potential were measured to characterize the apoptotic process.
Main Results:
- A low concentration cytokine cocktail (TNF-α 25 ng/ml, IFN-γ 25 ng/ml, IL-1β 50 ng/ml) induced significant early and late apoptosis within 6 hours.
- The model demonstrated a 1.5-fold increase in NO production and a 1.2-fold increase in oxidative stress compared to controls.
- A decrease in mitochondrial membrane potential was observed, indicative of apoptosis.
Conclusions:
- The developed cytokine cocktail model is effective in inducing beta cell apoptosis, mimicking key aspects of T1DM pathogenesis.
- This model provides a reliable system for the early assessment and screening of drugs designed to protect beta cells from apoptosis.
- The model facilitates the development of novel therapeutic strategies to halt the progression of type 1 diabetes.
