Fluorescent microplate assay for respiratory burst of PMNs challengedin vitro with orthopedic metals
✍ Scribed by Ciapetti, Gabriela ;Granchi, Donatella ;Verri, Elisabetta ;Savarino, Lucia ;Cenni, Elisabetta ;Savioli, Franca ;Pizzoferrato, Arturo
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 163 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
This report describes a simple, rapid, automated microassay for measuring in vitro changes of oxidative burst of phagocytes following challenge with metals for orthopedic devices. The production of reactive oxygen species (ROS) by polymorphonuclear leukocytes (PMNs) was measured using 2Ј,7Ј-dichlorofluorescin-diacetate (DCFH-DA) as fluorescent probe. DCFH-DA enters the cells and is oxidized by ROS to fluorescent DCF. The DCF generated was directly proportional to ROS produced intracellularly: The fluorescence intensity was read and converted to an index of ROS production by cells. In our experimental system, granulocytes (PMNs) were isolated from normal human blood and seeded in microplates. To verify if metals could influence ROS production, chromium, cobalt, nickel, molybdenum, ti-tanium, aluminum, and vanadium prepared as aqueous extracts in phosphate-buffered saline were tested onto PMNs using phorbolmyristate acetate (PMA) as positive control. Molybdenum, aluminum, and vanadium increased ROS generation by PMNs, while signals not different from unstimulated PMNs were recorded for chromium, cobalt, nickel, and titanium. The DCFH-DA microplate-based assay provides an in vitro tool for the detection of oxygen-reactive species generated by PMNs as a response to metals.