Peptide hormone

Peptide hormone is a type of hormone that is composed of short chains of amino acids. These hormones are secreted by various glands in the body and play a crucial role in regulating a wide range of physiological processes.

Structure

Peptide hormones are made up of amino acids that are linked together by peptide bonds. The length of these chains can vary, with some peptide hormones consisting of just a few amino acids, while others may contain dozens. The structure of a peptide hormone is determined by the sequence of its amino acids, which in turn determines its biological activity.

Function

Peptide hormones function by binding to specific receptors on the surface of cells. This binding triggers a series of events within the cell that leads to a response. The exact nature of this response can vary depending on the specific hormone and the type of cell it is interacting with. Some common functions of peptide hormones include regulating metabolism, growth and development, and immune system function.

Examples

There are many different types of peptide hormones. Some examples include insulin, which regulates blood sugar levels; growth hormone, which stimulates growth and cell reproduction; and antidiuretic hormone, which helps to regulate water balance in the body.

Synthesis

Peptide hormones are synthesized in the endoplasmic reticulum of cells. The process begins with the transcription of the hormone's gene into mRNA, which is then translated into a chain of amino acids. This chain is then folded into its final, functional form.

See also

• Protein hormone
• Steroid hormone
• Hormone receptor

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Peptide hormone

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