Definition

1. Adjective: Of or relating to an autacoid. An autacoid is a physiologically active substance (like a hormone or a local hormone) that is produced in one part of the body and affects cells in the same or a nearby region, rather than being secreted by a ductless gland into the bloodstream like a classic hormone.

Usage Examples

• Adjective:
  • The researchers studied the autacoidal effects of prostaglandins on local inflammation.
  • Histamine's action is primarily autacoidal, influencing nearby tissues.

Advanced Usage

• Scientific Context: The term is almost exclusively used in specialized biological, medical, or pharmacological texts to describe the local, hormone-like activity of certain substances.
  • The autacoidal regulation of blood flow in the kidney is a complex process.

Variants and Related Words

• Autacoid (noun): The substance itself (e.g., histamine, serotonin, prostaglandins).
  • Bradykinin is an important autacoid involved in pain and inflammation.

Synonyms

• Local hormone (noun phrase): A common, more descriptive synonym for 'autacoid', which 'autacoidal' describes.
• Paracrine (adjective): Referring to a type of cellular signaling where the target cell is close to the signal-releasing cell, which is the mode of action for many autacoids.

Adjective

1. of or relating to an autacoid