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Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

Sperm Structure and Semen Composition

Sperm Structure and Semen Composition

During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...

Spermatogenesis

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

Spermatogenesis

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...

Mitochondrial Membranes

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Related Experiment Video

Updated: May 9, 2026

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

Mitochondria functionality and sperm quality.

Alexandra Amaral¹, Bárbara Lourenço, Mónica Marques

¹Biology of Reproduction and Stem Cell Group, CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.

Reproduction (Cambridge, England)

|August 1, 2013

Summary

This summary is machine-generated.

Mitochondria play a crucial role in sperm function and fertilization, impacting motility and reproductive success. Despite debate on ATP production, their involvement in reactive oxygen species generation and calcium signaling is vital for sperm quality.

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Area of Science:

Cell Biology
Reproductive Biology
Mitochondrial Biology

Background:

Mitochondria are vital organelles in eukaryotic cells, performing functions beyond ATP production, including calcium homeostasis, ROS generation, apoptosis, and steroidogenesis.
While paternal mitochondria are eliminated post-fertilization, sperm mitochondria are essential for successful fertilization and sperm quality.

Purpose of the Study:

To review the potential roles of mitochondria in mammalian sperm function.
To explore the relationship between mitochondrial function and sperm quality, motility, and fertilization ability in humans.

Main Methods:

Literature review of existing studies on sperm mitochondria.
Analysis of data correlating mitochondrial defects with sperm function loss.
Examination of evidence from genetically engineered mouse models.

Main Results:

Alterations in mitochondrial integrity (ultrastructure, genome, transcriptome, proteome) and function (membrane potential, oxygen consumption) are linked to decreased sperm motility.
Evidence suggests glycolysis, not mitochondrial ATP, may be the primary energy source for sperm motility, though data are conflicting.
Sperm mitochondria are implicated in producing reactive oxygen species (ROS) at controlled levels necessary for sperm function and may act as calcium stores.

Conclusions:

Sperm mitochondrial functionality is critical for fertilization, with defects correlating to impaired sperm quality.
The precise role of mitochondrial ATP in sperm motility remains debated, with glycolysis potentially being the main contributor.
Beyond energy production, sperm mitochondria are crucial for ROS generation and calcium signaling, influencing sperm function and fertilizing capacity.