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Receptor-mediated immunomodulation by corticotropin-releasing factor

T Audhya1, R Jain, C S Hollander

  • 1Department of Medicine, New York University Medical Center, NY 10016.

Cellular Immunology
|April 15, 1991
PubMed

Insights

Corticotropin-releasing factor (CRF) binds to immune cells, suppressing their function. This study confirms CRF

Area of Science:

  • Immunology
  • Neuroendocrinology

Background:

  • Corticotropin-releasing factor (CRF) is implicated in stress responses and immune modulation.
  • Previous studies suggest CRF influences immune function, but specific cellular targets were unclear.

Purpose of the Study:

  • To investigate the direct binding of CRF to human immune cells.
  • To elucidate the functional consequences of CRF binding on immune cell activity.
  • To confirm the role of CRF in immunomodulation.

Main Methods:

  • CRF binding assays on human monocyte-macrophages and T-lymphocytes.
  • Measurement of intracellular cyclic AMP (cAMP) levels following CRF exposure.
  • Assessment of rat splenocyte proliferation in response to interleukin-2 (IL-2) with and without CRF.
  • Use of CRF antagonists to block CRF effects.

Main Results:

  • Specific binding sites for CRF were identified on human monocyte-macrophages and T-helper lymphocytes.
  • CRF binding led to increased intracellular cAMP concentrations in these cells.
  • CRF inhibited IL-2-induced rat splenocyte proliferation, an effect reversed by CRF antagonists.
  • CRF did not bind to T-suppressor or B lymphocytes.

Conclusions:

  • CRF possesses specific receptors on key immunocytes, including monocyte-macrophages and T-helper lymphocytes.
  • CRF binding modulates immune cell function, evidenced by cAMP production and suppressed proliferation.
  • These findings strengthen the evidence for CRF's significant role in neuroendocrine-immune interactions and immunomodulation.

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