Analysis of CDK Inhibitor Action on Mitochondria-Mediated Apoptosis

Area of Science:

• Cell Biology
• Biochemistry
• Cancer Research

Background:

• Cyclin-dependent kinase inhibitors (CDKIs) regulate cell proliferation by inhibiting cyclin-dependent kinases.
• CDKIs are investigated for their potential to induce apoptosis in cancer cells, thereby controlling excessive cell reproduction.
• Mitochondrial alterations are key events in apoptosis induction.

Purpose of the Study:

• To describe standardized procedures for studying apoptosis induction by CDKIs.
• To evaluate morphological and functional mitochondrial alterations following CDKI treatment.
• To provide a comprehensive methodology for assessing CDKI-induced cell death.

Main Methods:

• Measurement of mitochondrial membrane potential (ΔΨm) using TMRE dye.
• Determination of intracellular ATP content.
• Observation of mitochondrial network morphology using fluorescent reporters (HeLa cells with DsRed targeting mitochondrial matrix).
• Assessment of mitochondrial ultrastructure via transmission electron microscopy.
• Evaluation of mitochondrial outer membrane permeabilization by tracking cytochrome c (cyt C) localization (HeLa cells with cyt C-GFP).

Main Results:

• The described methods allow for detailed analysis of mitochondrial function and morphology.
• Specific procedures enable the quantification of key apoptotic events, such as changes in ΔΨm and ATP levels.
• The study provides a framework for confirming cyt C release, a critical step in apoptosis.

Conclusions:

• The presented procedures offer a robust approach to investigate CDKI-induced apoptosis.
• These methods facilitate the comprehensive evaluation of mitochondrial roles in CDKI-mediated cell death.
• This chapter serves as a practical guide for researchers studying apoptosis and cell cycle regulation.