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. 1988 Aug;56(8):2016–2022. doi: 10.1128/iai.56.8.2016-2022.1988

Stimulation of neutrophil actin polymerization and degranulation by opsonized and unopsonized Candida albicans hyphae and zymosan.

M P Kolotila 1, R D Diamond 1
PMCID: PMC259517  PMID: 3294183

Abstract

We previously showed that unopsonized Candida albicans hyphae stimulated a delayed rise in the putative neutrophil second messengers Ca2+ and inositol 1,4,5-trisphosphate and subsequent O2- release, as compared with opsonized hyphae or zymosan. Therefore, cytoskeletal and degranulation temporal responses to these stimuli were examined. Unopsonized zymosan elicited no neutrophil responses under the experimental condition used. Neutrophil actin polymerization (quantitated by fluorescent measurements of NBD phallacidin) was rapid after stimulation by opsonized hyphae or zymosan (peaking at 1 and 2 min, respectively). This corresponded to observed changes in microscopic actin polymerization, measured with rhodamine phalloidin, which progressed from initially diffuse to collarlike to cylinderlike staining patterns surrounding the hyphae. Compared with opsonized hyphae, unopsonized hyphae resulted in a delayed appearance of the last two visible patterns (P less than 0.05) and in quantitative actin polymerization despite similarly rapid initial contact and spreading over the hyphae by neutrophils. Unlike other neutrophil responses, degranulation did not follow the delayed patterns of responses to stimulation with unopsonized hyphae. In the absence of the release of the cytoplasmic marker lactate dehydrogenase, the release of beta-glucuronidase, an azurophil granule marker, gradually and progressively rose in response to all of the stimuli but unopsonized zymosan. The low but significant levels observed were within a range consistent with published results for degranulation responses to particulate stimuli without cytochalasin B. A quantitative immunoassay of lactoferrin, a specific granule marker, detected no release into supernatants, and immunofluorescent staining indicated concomitant depletion of lactoferrin from neutrophil granules and binding to hyphal and neutrophil surfaces after stimulation by unopsonized hyphae. Thus, the delayed actin polymerization response to unopsonized hyphae occurred subsequent to neutrophil attachment and spreading and resembled the temporal sequence of other neutrophil responses linked to the respiratory burst. In contrast, the degranulation responses to all stimuli appeared to begin and progress gradually after observed attachment and spreading of the neutrophil over hyphal surfaces without a clear temporal relationship to rises in cytoplasmic Ca2+ or F-actin. In addition, the avid binding of released lactoferrin to cell surfaces eliminates its value as a quantitative marker of enzyme release but raises the possibility that it might participate in fungicidal activity.(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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