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Somatostatin receptor (SSTR) expression and function in normal and leukaemic T-cells. Evidence for selective effects

T Talme1, J Ivanoff, M Hägglund

  • 1Department of Medicine, Section of Dermatology and Venereology, Karolinska Institutet at Huddinge University Hospital, Huddinge, Sweden.

Clinical and Experimental Immunology
|July 27, 2001
PubMed

Insights

Normal T-cells express somatostatin receptors (SSTR1-5), with distinct patterns differentiating them from T-leukemia cells. Somatostatin enhances T-cell adhesion via SSTR2 and SSTR3, suggesting therapeutic potential.

Area of Science:

  • Immunology
  • Endocrinology
  • Molecular Biology

Background:

  • T-lymphocytes play crucial roles in immune responses.
  • Somatostatin receptors (SSTRs) are implicated in various cellular functions.
  • Understanding SSTR expression in T-cells can reveal insights into lymphocyte regulation.

Purpose of the Study:

  • To investigate the expression of somatostatin receptor subtypes (SSTR1-5) in normal T-lymphocytes and T-leukemia cell lines.
  • To explore the functional role of SSTRs in T-cell adhesion to extracellular matrix components.
  • To determine if SSTR expression patterns can differentiate normal from leukaemic T-cells.

Main Methods:

  • Reverse transcription-polymerase chain reaction (RT-PCR) and PCR were used to detect SSTR gene expression.
  • Somatostatin analogs specific for various SSTR subtypes were employed to study functional effects.
  • T-cell adhesion assays were performed using fibronectin, collagen type IV, and laminin as substrates.

Main Results:

  • Normal T-cells expressed SSTR1, SSTR2, SSTR3, SSTR4, and SSTR5, with SSTR5 selectively found on activated cells.
  • T-leukemia cell lines expressed SSTR2, SSTR3, and SSTR4, but lacked SSTR1 and SSTR5.
  • Somatostatin and analogs targeting SSTR2/SSTR3 significantly enhanced T-cell adhesion to fibronectin, collagen type IV, and laminin.

Conclusions:

  • T-lymphocytes express multiple SSTR subtypes, with distinct expression profiles in normal versus leukaemic cells.
  • Somatostatin signaling through SSTR2 and SSTR3 can modulate T-cell adhesion to extracellular matrix components.
  • SSTR subtypes represent potential therapeutic targets for inflammatory diseases and lymphoid malignancies.

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