Intracrine refers to a hormone that acts inside a cell, regulating intracellular events. In simple terms it means that the cell stimulates itself by cellular production of a factor that acts within the cell. Steroid hormones act through intracellular (mostly nuclear) receptors and, thus, may be considered to be intracrines.

There are several protein/peptide hormones that are also intracrines. Notable examples that have been described in the references include:

  • Peptides of the renin–angiotensin system: angiotensin II and angiotensin (1-7)
  • Fibroblast growth factor 2
  • Parathyroid hormone-related protein

See also Signal transduction.

Human parathyroid hormone fragment hPTH (1-39); 1bwx

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Alexander Berchansky