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Role of divalent cations in binding polymorphonuclear leucocytes to glomeruli with immune complexes
Clinical and Experimental Immunology
|March 1, 1980
Summary
Magnesium ions (Mg++) are crucial for polymorphonuclear leucocyte (PMN) binding to glomeruli during experimental glomerulonephritis. Calcium ions (Ca++) can partially substitute for Mg++ in this immune complex-mediated process.
Area of Science:
- Immunology
- Nephrology
- Cellular Biology
Background:
- Immune complexes in glomeruli trigger biological activity.
- Polymorphonuclear leucocytes (PMN) bind to affected glomeruli.
- The role of divalent cations and serum factors in PMN binding is unclear.
Purpose of the Study:
- To investigate the role of divalent cations and serum factors in PMN binding to glomeruli.
- To elucidate the mechanisms of immune complex localization and complement activation in experimental glomerulonephritis.
Main Methods:
- A two-step method was developed for assessing PMN binding.
- Rat kidney sections with induced glomerulonephritis were incubated with PMN in serum-free media.
- Sections were pretreated with fresh or divalent cation-chelated sera.
Main Results:
- Magnesium ions (Mg++) are essential for maximal PMN binding to glomeruli.
- Calcium ions (Ca++) can partially substitute for Mg++.
- Immune complexes in glomeruli activate complement via classical and alternative pathways.
Conclusions:
- Divalent cations, particularly Mg++, play a critical role in PMN recruitment during glomerulonephritis.
- Understanding these interactions is key to comprehending immune-mediated kidney damage.
- Complement system activation is a central event in the pathogenesis of this condition.