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Related Experiment Video

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High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa

High-Resolution Respirometry to Assess Mitochondrial Function in Human Spermatozoa

Published on: June 23, 2023

Mitochondrial signaling and fertilization.

Jonathan Van Blerkom¹, Patrick Davis

¹Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309, USA. jonathan.vanblerkom@colorado.edu

Molecular Human Reproduction

|September 26, 2007

Summary

High-polarized mitochondria (HPM) in mouse oocytes are crucial for sperm penetration and cortical granule release during fertilization. Their potential difference (DeltaPsim) dissipation is necessary for these early fertilization events.

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Area of Science:

Cell Biology
Reproductive Biology
Mitochondrial Physiology

Background:

The inner mitochondrial membrane potential (DeltaPsim) regulates key cellular functions like ATP production and calcium homeostasis.
Mitochondria in specific subplasmalemmal domains of mouse oocytes exhibit high DeltaPsim and unique localization.
The role of these specialized mitochondria in the initial stages of fertilization remains largely unexplored.

Purpose of the Study:

To investigate the involvement of high DeltaPsim mitochondria in the subplasmalemmal cytoplasm of mouse oocytes in early fertilization events.
To determine if mitochondrial potential difference is essential for sperm attachment, penetration, and cortical granule exocytosis.

Main Methods:

Experimental manipulation of DeltaPsim magnitude and mitochondrial distribution in zona-free MII mouse oocytes.
Insemination and subsequent culture of manipulated oocytes.
Assessment of sperm-oocyte interactions, including attachment, penetration, and cortical granule exocytosis.

Main Results:

High-polarized mitochondria (HPM) are essential for sperm penetration and cortical granule exocytosis, but not for sperm attachment.
Transient reductions (dissipations) in DeltaPsim of subplasmalemmal mitochondria are necessary for successful oocyte penetration and cortical granule release.
A continuous circuit of HPM may facilitate signal propagation in the subplasmalemmal cytoplasm during fertilization.

Conclusions:

The unique mitochondrial domain with high DeltaPsim in the mouse oocyte plays a critical role in sperm penetration and cortical granule exocytosis.
The capacity for DeltaPsim dissipation in these subplasmalemmal mitochondria is vital for fertilization.
Dysregulation of this mitochondrial domain may lead to fertilization failure or abnormalities, highlighting its importance in oocyte maturation.