Tumor necrosis factor as an autocrine and paracrine signal controlling the macrophage secretory response to Candida albicans
| Autor: | Francesco Bistoni, Lucia Pitzurra, Andrea Bartoli, Elisabetta Blasi, Manuela Puliti |
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| Rok vydání: | 1994 |
| Předmět: |
Lipopolysaccharides
medicine.medical_specialty medicine.medical_treatment Immunology Microbiology Cell Line Mice Paracrine signalling Internal medicine Candida albicans medicine Animals Secretion RNA Messenger Autocrine signalling biology Tumor Necrosis Factor-alpha Macrophages biology.organism_classification Corpus albicans Cell biology Mice Inbred C57BL Infectious Diseases Cytokine Endocrinology Cell culture Parasitology Tumor necrosis factor alpha Interleukin-1 Research Article |
| Zdroj: | Infection and Immunity. 62:1199-1206 |
| ISSN: | 1098-5522 0019-9567 |
| Popis: | We have previously demonstrated that the hyphal form of Candida albicans (H-Candida), but not the yeast form (Y-Candida), acts as a macrophage-stimulating agent. The early response (1 to 3 h) of the macrophage cell line ANA-1 to H-Candida results in enhanced tumor necrosis factor (TNF) transcription and production. Here we show that when coincubation times are prolonged (3 to 24 h), Y-Candida also exhibits stimulatory properties. This phenomenon has been ascribed to the occurrence of the dimorphic transition, as demonstrated by microscopic evaluation of the cultures and by experiments in which both killed Y-Candida and the agerminative strain C. albicans PCA-2 failed to induce cytokine production. TNF produced in response to H-Candida acts as an autocrine and paracrine signal controlling the macrophage secretory response to C. albicans. In fact, addition of anti-TNF polyclonal antibodies to the coculture of ANA-1 macrophages and H-Candida results in a marked and time-dependent decrease of TNF transcript levels. Moreover, pretreatment of macrophages with recombinant TNF for 3 h enhances TNF and induces interleukin-1 production in response to both forms of Candida, while pretreatment for 18 h renders macrophages refractory to any stimuli. Interestingly, the kinetics of interleukin-1 transcription and secretion in response to H-Candida are delayed with respect to those of TNF. Overall, these data indicate that TNF, produced by macrophages in response to H-Candida, regulates its own production as well as that of other soluble factors, thus suggesting that this cytokine plays multiple roles in the immune mechanisms involved in Candida infection. |
| Databáze: | OpenAIRE |
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