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Luminal CCK-releasing factor stimulates CCK release from human intestinal endocrine and STC-1 cells.

Publication ,  Journal Article
Wang, Y; Prpic, V; Green, GM; Reeve, JR; Liddle, RA
Published in: Am J Physiol Gastrointest Liver Physiol
January 2002

CCK is secreted into the blood from intestinal endocrine cells following ingestion of a meal. Recently, it has been demonstrated that the ability of certain foods to stimulate CCK release is mediated by endogenously produced CCK-releasing factors. A newly discovered luminal CCK-releasing factor (LCRF) is secreted into the intestine, where it stimulates CCK secretion. However, the mechanism whereby LCRF affects intestinal epithelial cells is unknown. The current study was designed to determine whether LCRF has a direct effect on CCK cells to stimulate hormone secretion. In dispersed human intestinal mucosal cells, LCRF (5-200 nM) significantly stimulated CCK release in a concentration-dependent manner. This stimulatory effect was absent in calcium-free media and was inhibited by the L-type calcium-channel blockers diltiazem and nifedipine. To examine direct cellular effects of LCRF on CCK cells, further studies were conducted in the CCK-containing enteroendocrine cell line STC-1. As in native cells, LCRF significantly stimulated CCK release from STC-1 cells in a calcium-dependent manner. In cells loaded with a calcium-sensitive dye, LCRF stimulation produced a rapid increase in intracellular calcium. To examine the electrophysiological basis for this stimulation, whole cell recordings were made from STC-1 cells. Whole cell calcium currents were identified under basal conditions; moreover, calcium-channel activity was increased by LCRF. These studies demonstrate that 1) LCRF has a direct effect on human intestinal cells to stimulate CCK secretion, 2) stimulated hormone release is calcium dependent, and 3) LCRF activates calcium currents in CCK cells, which leads to CCK secretion.

Duke Scholars

Published In

Am J Physiol Gastrointest Liver Physiol

DOI

ISSN

0193-1857

Publication Date

January 2002

Volume

282

Issue

1

Start / End Page

G16 / G22

Location

United States

Related Subject Headings

  • Tumor Cells, Cultured
  • Trypsin Inhibitor, Kazal Pancreatic
  • Nifedipine
  • Membrane Potentials
  • Jejunum
  • Intercellular Signaling Peptides and Proteins
  • Humans
  • Growth Substances
  • Gastroenterology & Hepatology
  • Gastric Mucosa
 

Citation

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Wang, Y., Prpic, V., Green, G. M., Reeve, J. R., & Liddle, R. A. (2002). Luminal CCK-releasing factor stimulates CCK release from human intestinal endocrine and STC-1 cells. Am J Physiol Gastrointest Liver Physiol, 282(1), G16–G22. https://doi.org/10.1152/ajpgi.2002.282.1.G16
Wang, Yu, Vera Prpic, Gary M. Green, Joseph R. Reeve, and Rodger A. Liddle. “Luminal CCK-releasing factor stimulates CCK release from human intestinal endocrine and STC-1 cells.Am J Physiol Gastrointest Liver Physiol 282, no. 1 (January 2002): G16–22. https://doi.org/10.1152/ajpgi.2002.282.1.G16.
Wang Y, Prpic V, Green GM, Reeve JR, Liddle RA. Luminal CCK-releasing factor stimulates CCK release from human intestinal endocrine and STC-1 cells. Am J Physiol Gastrointest Liver Physiol. 2002 Jan;282(1):G16–22.
Wang, Yu, et al. “Luminal CCK-releasing factor stimulates CCK release from human intestinal endocrine and STC-1 cells.Am J Physiol Gastrointest Liver Physiol, vol. 282, no. 1, Jan. 2002, pp. G16–22. Pubmed, doi:10.1152/ajpgi.2002.282.1.G16.
Wang Y, Prpic V, Green GM, Reeve JR, Liddle RA. Luminal CCK-releasing factor stimulates CCK release from human intestinal endocrine and STC-1 cells. Am J Physiol Gastrointest Liver Physiol. 2002 Jan;282(1):G16–G22.

Published In

Am J Physiol Gastrointest Liver Physiol

DOI

ISSN

0193-1857

Publication Date

January 2002

Volume

282

Issue

1

Start / End Page

G16 / G22

Location

United States

Related Subject Headings

  • Tumor Cells, Cultured
  • Trypsin Inhibitor, Kazal Pancreatic
  • Nifedipine
  • Membrane Potentials
  • Jejunum
  • Intercellular Signaling Peptides and Proteins
  • Humans
  • Growth Substances
  • Gastroenterology & Hepatology
  • Gastric Mucosa