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Oogenesis

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

Oogenesis

Oogenesis

Oogenesis, the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...

Peroxisomes

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

Peroxisomes

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

Peroxisomes

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...

Overview of Fatty Acid Metabolism

Overview of Fatty Acid Metabolism

Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...

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Related Experiment Video

Updated: Jul 13, 2026

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

Published on: March 25, 2020

[Oxysterols: genesis and basic functions].

A V Antonchik, V N Zhabinskiĭ, V A Khripach

Bioorganicheskaia Khimiia

|August 9, 2007

Summary

Oxysterols, derived from cholesterol oxidation, play a dual role in cholesterol homeostasis and atherosclerosis development. These compounds show potential as valuable biomarkers for various pathological processes.

Area of Science:

Biochemistry
Molecular Biology
Pathology

Context:

Oxysterols are critical products of cholesterol oxidative transformations.
These transformations occur via both enzymatic and nonenzymatic pathways.
Understanding oxysterol formation is key to metabolic research.

Purpose:

To discuss the structural characteristics of common oxysterols.
To review the pathways of oxysterol formation from cholesterol.
To examine the role of oxysterols in cholesterol homeostasis and atherosclerosis.

Summary:

This review details the structural features of prevalent oxysterols, which arise from cholesterol oxidation through enzymatic and nonenzymatic routes.
It explores the biological pathways governing their synthesis and their involvement in maintaining cholesterol balance.

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Published on: April 14, 2017

Studies on the Anti-Inflammatory Effect of Xiaoyao Pills in The Treatment of Postmenopausal Osteoporosis in Mice

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Last Updated: Jul 13, 2026

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol

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The paper also investigates the contribution of oxysterols to the pathogenesis of atherosclerosis.

Impact:

Oxysterols are implicated in the development of atherosclerosis.
The study highlights the potential of oxysterols as diagnostic markers for pathological conditions.
Findings contribute to understanding cholesterol metabolism and related diseases.