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December 1996

Exudative Neutrophils Show Impaired pH Regulation Compared With Circulating Neutrophils

Author Affiliations

From the Department of Surgery, The Toronto Hospital, University of Toronto (Drs Hackam, Nathens, Watson, Marshall, and Rotstein), and the Department of Cell Biology, Hospital for Sick Children (Dr Grinstein), Toronto, Ontario.

Arch Surg. 1996;131(12):1296-1301. doi:10.1001/archsurg.1996.01430240050006

Objective:  To investigate the effects of neutrophil (PMN) transmigration into inflammatory sites on cytosolic pH (pHi) regulation.

Design:  Exudative PMNs were obtained by bronchoalveolar lavage from rats sustaining endotoxin-induced lung injury. Circulating PMNs were purified with density-gradient centrifugation. Cytosolic pH was measured with single-cell fluorescence imaging using the pH-sensitive dye biscarboxyethyl-carboxyfluorescein.

Results:  Exudative PMNs showed impaired pH, recovery from an induced acid load compared with circulating PMNs. Under conditions of extracellular acidosis, exudative PMNs showed impaired pHi homeostasis and produced decreased superoxide compared with circulating cells. Inhibition of the sodiumproton exchanger attenuated the differences in pHi recovery, suggesting a mechanism underlying the pHi regulatory dysfunction. All cells had comparable adenosine triphosphate levels and superoxide production at physiologic extracellular pH.

Conclusion:  Impaired pH, regulation of exudative cells may mediate cellular dysfunction and impaired resolution of infection at inflammatory sites.Arch Surg. 1996;131:1296-1301

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