Cl-/HCO3- exchange activity in fMLP-stimulated human neutrophils
It is well known that chemotactic agents active Na+/H+ exchanger, increasing intracellular pH of neutrophils, but their effect on bicarbonate transporters have not been established yet. To study the effect of fMLP on the activity of Cl/HCO3 exchange, the rate of pH recovery after acute Cl readmissio...
| Authors: | , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2011 |
| Country: | Argentina |
| Institution: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repository: | CONICET Digital (CONICET) |
| Language: | English |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/60871 |
| Online Access: | http://hdl.handle.net/11336/60871 |
| Access Level: | Open access |
| Keyword: | Chloride-Bicarbonate Exchanger Neutrophils Intracelular Ph Chloride https://purl.org/becyt/ford/3.1 https://purl.org/becyt/ford/3 |
| Summary: | It is well known that chemotactic agents active Na+/H+ exchanger, increasing intracellular pH of neutrophils, but their effect on bicarbonate transporters have not been established yet. To study the effect of fMLP on the activity of Cl/HCO3 exchange, the rate of pH recovery after acute Cl readmission in cell subjected to an alkaline load by CO2 washout in a Cl-free medium was measured. The activity of the exchanger was reduced to 72% of control when cells were pre-incubated for 5 min with 0.1 lM fMLP and reached 48% of control in steady state after acute exposure. After extracellular bicarbonate or TMA addition the rate recovery of intracellular pH was reduce at 72% and at 84%, respectively. The inhibitory effect on the intracellular pH recovery was not affected by blockers of Na+/H+ xchange. We conclude from these studies that an increase of pHi produced for this chemotactic agent is facilitated by the simultaneous activation of Na+/H+ exchange and inhibition of Cl/HCO 3 exchange in neutrophils. |
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