Neutrophil polarisation in plasma differs to that induced by endogenous chemoattractants with regard to frequency of uropod formation and requirement for divalent cations.
Human neutrophils suspended in Hanks' balanced salt solution (37 degrees C, 20 mM Hepes, pH 7.2) produced extensions, elongated and developed a polarised morphology with both a pseudopod and uropod when exposed to C5a (10 nM), leukotriene B4 (10 nM), platelet activating factor (40 nM) or interleukin-8 (12.5 nM). Responses to each mediator were generally enhanced or unaffected by chelators of extracellular Ca2+ and Mg2+. Neutrophils suspended in heparinised plasma (90-10% v/v in Hanks' balanced salt solution) produced extensions, elongated and developed a pseudopod, but rarely developed a uropod unless additional Mg2+ ions (0.5-5 mM) were added. These findings demonstrate that the polarisation of neutrophils in plasma is significantly different to that induced by endogenous chemoattractants with regard to the frequency of uropod formation and requirement for extracellular divalent cations.
Department of Pathology, University of Adelaide, Australia.
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Harkin
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Bignold
D002118:Calcium / Q000494:pharmacology*; D002450:Cell Communication / Q000187:drug effects / Q000502:physiology; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology; D002630:Chemotactic Factors / Q000502:physiology*; D015936:Complement C5a / Q000494:pharmacology; D004357:Drug Synergism; D006801:Humans; D016209:Interleukin-8 / Q000494:pharmacology; D007975:Leukotriene B4 / Q000494:pharmacology; D008274:Magnesium / Q000494:pharmacology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000166:cytology* / Q000502:physiology*; D010972:Platelet Activating Factor / Q000494:pharmacology
D002630:Chemotactic Factors; D016209:Interleukin-8; D010972:Platelet Activating Factor; D007975:Leukotriene B4; D009240:N-Formylmethionine Leucyl-Phenylalanine; D015936:Complement C5a; D008274:Magnesium; D002118:Calcium