Dictionary > Steroid hormone

Steroid hormone

noun, plural: steroid hormones
A type of steroid that acts as a hormone, and that which is exemplified by sex steroids, corticosteroids, and anabolic steroids
Steroids are organic compounds derived from lanosterol in animals and fungi and from cycloartenol in plants. In animals, the steroids include those found in vertebrates and insects. Steroids in vertebrates, including humans, include cholesterol and steroid hormones.
A steroid hormone is a steroid that acts as a hormone. Steroid hormones include sex steroids (e.g. androgens, estrogens, and progesterones), corticosteroids (e.g. glucocorticoids and mineralocorticoids), and anabolic steroids. They, therefore, are involved in regulating the development of sexual characteristics, inflammation, immune functions, and homeostasis.
Steroid hormones are derived generally from the sterol, cholesterol. Depending on the type, they are produced in the gonads or in the adrenal glands. When they are secreted, they are released into the bloodstream while bound to carrier proteins (e.g. sex hormone-binding globulin for sex hormones, corticosteroid-binding protein for corticosteroids, albumin, etc.). Then, they reach their target cell. In free hormone hypothesis, the steroid hormone is hypothesized to freely pass through the cell membrane of the target cell since they are lipids. Inside the cell, they become active when the carrier protein releases them and bind to the steroid hormone receptors in the nucleus or in the cytosol. This interaction will bring about changes within the cell.
In another hypothesis, the steroid hormone-carrier protein complex docks to megalin, a membrane receptor. This then leads to its endocytosis to be taken inside the target cell. When inside, the complex is brought to the lysosome to degrade the carrier protein and release the steroid hormone into the cytosol. The steroid hormone then exerts its effect on the cell via a genomic pathway.
See also:

You will also like...


Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

Structural depiction of catalase, an enzyme
Protein Activity and Cellular Metabolism

Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, ..

Population Regulation in an Ecosystem
Population Regulation in an Ecosystem

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

Protein (illustration)
Protein Variety

The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

Takahē (Porphyrio hochstetteri)

Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

Cell structure
Cell Structure

A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..