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Related Experiment Videos

Low density lipoprotein receptor expression and function in human polymorphonuclear leucocytes

L L Lara1, H Rivera, C Perez-P

  • 1Instituto de Immunología, Facultad de Medecina, Universidad Central deVenezuela, Caracas.

Clinical and Experimental Immunology
|January 1, 1997
PubMed
Summary
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Low density lipoprotein receptors (LDLR) on neutrophils (PMN) internalize LDL, triggering an oxidative burst. This LDL-induced effect is mediated by protein kinase-C (PKC) signaling, highlighting a novel role for LDLR in immune cell function.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Low density lipoprotein receptors (LDLR) are crucial for cellular cholesterol uptake.
  • Polymorphonuclear neutrophils (PMN) express LDLR, suggesting a role beyond cholesterol homeostasis.
  • The functional consequences of LDLR expression and LDL interaction in PMN remain largely unexplored.

Purpose of the Study:

  • To investigate the expression and function of LDLR in human PMN.
  • To characterize the interaction of LDL with PMN and its effect on cellular activity.
  • To elucidate the signaling pathways involved in LDL-mediated PMN responses.

Main Methods:

  • Flow cytometry was used to assess LDLR expression and LDL internalization (using labeled LDL-DiI).
  • Radioligand binding assays (LDL-125I) and Lineweaver Burk/Scatchard analyses quantified LDL binding kinetics.

Related Experiment Videos

  • Oxidative burst was measured by DCF formation, and protein kinase-C (PKC) activity was assessed via membrane translocation assays.

    • Main Results:

    • PMN exhibit high-affinity LDL binding (Kd = 15.0 x 10(-9) M), with significantly more binding sites than monocytes or lymphocytes.
    • LDL binding to PMN induced a rapid, transient increase in oxidative burst, mediated by LDLR.
    • LDL stimulation of PMN oxidative burst involved a protein kinase-C (PKC) dependent pathway, evidenced by increased PKC translocation.

    Conclusions:

    • PMN possess functional LDLR that mediate LDL internalization and trigger a potent oxidative burst.
    • The LDL-induced oxidative burst in PMN is a PKC-dependent process.
    • These findings reveal a novel immunomodulatory role for LDL in PMN function, potentially impacting inflammatory responses.