Parvalbumin alters mitochondrial dynamics and affects cell morphology.

Area of Science:

• Cell Biology
• Mitochondrial Dynamics
• Calcium Signaling

Background:

• Parvalbumin (PV) and mitochondria are crucial for calcium (Ca2+) handling.
• PV and mitochondrial volume are antagonistically regulated.
• Mitochondrial morphology, volume, and dynamics (fusion, fission, mitophagy) are key cellular processes.

Purpose of the Study:

• To investigate how modulating parvalbumin (PV) levels affects mitochondrial morphology, volume, and dynamics in MDCK epithelial cells.
• To understand the relationship between PV expression and cellular changes.
• To explore the reversibility of PV-induced mitochondrial alterations.

Main Methods:

• Stable overexpression and downregulation of parvalbumin (PV) in MDCK cells.
• Analysis of mitochondrial morphology, volume, and dynamics (fusion, fission, mitophagy).
• Assessment of gene expression related to mitochondrial fusion.
• Evaluation of cell morphology, size, and motility.

Main Results:

• Increased PV levels led to smaller, rounder cells with shorter mitochondria.
• PV overexpression reduced mitochondrial fusion rates and decreased expression of fusion-related genes.
• Elevated mitophagy was observed in PV-overexpressing cells, contributing to reduced mitochondrial volume.
• PV downregulation reversed these effects, increasing mitochondrial movement and fusion rates.
• PV modulation resulted in bi-directional and reversible changes in mitochondrial dynamics and volume.

Conclusions:

• Parvalbumin (PV) plays a significant role in regulating mitochondrial volume and dynamics.
• PV influences cell size, morphology, and motility through its effects on mitochondria.
• Mitochondrial dynamics are reversibly modulated by PV, highlighting its importance in cellular homeostasis.