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Stimulatory effect of lymphocyte-derived factor on catecholamine efflux from cultured bovine adrenal medullary cells

N Yanagihara1, K Hara, K Kajiwara

  • 1Department of Pharmacology, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.

Neuroscience Letters
|April 16, 1998
PubMed

Insights

Lymphocytes release a heat-sensitive factor that increases catecholamine release from adrenal medullary cells. This factor, with a molecular mass over 8 kDa, influences catecholamine efflux but not uptake.

Area of Science:

  • Neuroendocrinology
  • Immunology
  • Cell Biology

Background:

  • The adrenal medulla is crucial for stress response via catecholamine release.
  • Interactions between the immune system and endocrine organs are increasingly recognized.

Purpose of the Study:

  • To investigate the influence of lymphocytes on catecholamine release and uptake in bovine adrenal medullary cells.
  • To characterize the nature of the factor(s) released by lymphocytes that affect catecholamine secretion.

Main Methods:

  • Co-culture of bovine adrenal medullary cells with lymphocytes.
  • Treatment with lymphocyte-conditioned medium.
  • Assays for catecholamine appearance in culture medium.
  • Heat treatment and gel filtration/dialysis to characterize the active factor.
  • Measurement of lactate dehydrogenase activity and [3H]norepinephrine uptake.

Main Results:

  • Lymphocyte co-culture and conditioned medium significantly increased catecholamine appearance in the medium.
  • The stimulatory effect was time- and concentration-dependent.
  • Heat treatment reduced the stimulatory activity, indicating a heat-sensitive factor.
  • The active factor was found in a high molecular weight fraction (>8 kDa).
  • No significant effect on lactate dehydrogenase activity or norepinephrine uptake was observed.

Conclusions:

  • Lymphocytes release a heat-sensitive factor(s) with a molecular mass greater than 8 kDa.
  • This factor enhances the efflux of catecholamines from adrenal medullary cells.
  • The findings suggest a novel immunomodulatory mechanism affecting catecholamine secretion.

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