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Role of PMN's candidicidal activity in the pathogenesis of AIDS-related systemic candidiases
C Uberti Foppa1, F Franzetti, C Negri
1Clinica delle Malattie Infettive, Università degli Studi di Milano.
Abstract:
Phagocytic and fungicidal activity towards C. albicans spores were tested in 9 patients with AIDS-Related Complex (ARC), but without Candida infections, and in 13 patients with AIDS and deep candidiasis. No significant differences were observed between the two mentioned groups as far as PMN's phagocytosis and killing were concerned. PMN's migration in response to a "non-mycotic" chemoattractant was defective in both groups; although, from this point of view, patients with candidiasis were more severely affected. A significant difference was noted, instead, as far as mean T helper values were concerned; in fact, their number was significantly lower in patients with systemic candidiasis than in those with ARC or even AIDS, but oesophageal candidiasis only. In conclusion, defective PMN's activity towards C. albicans spores, as observed in vitro, does not seem in itself to predispose AIDS patients to candidiasis in vivo; mycoses may be rather due to defects of cell-mediated immunity as a whole.
Insights
Neutrophil (PMN) phagocytic and fungicidal activity against Candida albicans was similar in patients with AIDS-Related Complex (ARC) and AIDS. However, impaired neutrophil migration and lower T helper cells in AIDS patients suggest broader immune defects contribute to candidiasis.
Area of Science:
- Immunology
- Infectious Diseases
- Mycology
Background:
- Acquired Immunodeficiency Syndrome (AIDS) and AIDS-Related Complex (ARC) are characterized by compromised immune function.
- Candida albicans infections, particularly invasive candidiasis, are common opportunistic mycoses in immunocompromised individuals.
- Understanding the specific immune defects predisposing to candidiasis in these patients is crucial for effective management.
Purpose of the Study:
- To investigate the phagocytic and fungicidal activity of neutrophils (PMNs) towards Candida albicans spores in patients with ARC and AIDS.
- To assess neutrophil migration and T helper cell counts in relation to Candida infections in these patient groups.
- To determine the role of PMN function versus broader cell-mediated immunity defects in the pathogenesis of candidiasis in AIDS.
Main Methods:
- Comparative analysis of PMN phagocytosis and fungicidal activity against C. albicans spores.
- Evaluation of PMN migration in response to a non-mycotic chemoattractant.
- Quantification of T helper cell counts.
- Study groups included patients with ARC (without Candida) and patients with AIDS (with deep candidiasis).
Main Results:
- No significant differences in PMN phagocytosis or killing of C. albicans spores were observed between ARC and AIDS patients.
- Defective PMN migration was noted in both groups, with more severe impairment in patients with candidiasis.
- Significantly lower T helper cell counts were found in patients with systemic candidiasis compared to those with ARC or AIDS with only oesophageal candidiasis.
Conclusions:
- Defective in vitro PMN activity against C. albicans does not appear to be the sole factor predisposing AIDS patients to candidiasis.
- Invasive candidiasis in AIDS patients may be more strongly associated with overall defects in cell-mediated immunity.
- Further research into the complex interplay of immune deficiencies is warranted for understanding and treating opportunistic infections in AIDS.