Cell death and survival alterations in Malpighian tubules ofTriatoma infestansfollowing heat shock
| Autor: | Vera Lúcia Cortiço Corrêa Rodrigues, Nancy L. Garcia, Marly M. Dantas, Silvana G.P. Campos, Silvya Stuchi Maria-Engler, Maria Cristina H. Tavares, Maria Luiza S. Mello |
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| Rok vydání: | 2001 |
| Předmět: |
Malpighian tubule system
Programmed cell death Cell division Cell Survival media_common.quotation_subject Apoptosis Insect Malpighian Tubules Biology Polyploid Cells Biochemistry Euchromatin Necrosis Heterochromatin Triatoma infestans medicine Animals Triatoma Molecular Biology Cell survival media_common Cell Nucleus Cell Biology biology.organism_classification Cell biology Shock (circulatory) medicine.symptom Heat-Shock Response |
| Zdroj: | Biochemistry and Cell Biology. 79:709-717 |
| ISSN: | 1208-6002 0829-8211 |
| DOI: | 10.1139/o01-136 |
| Popis: | In this study, we examined cell survival and cell death in response to heat shock in an insect organ composed of highly polyploid cells no longer capable of cell division. For this, the frequency of nuclear phenotypes in Feulgen-stained Malpighian tubules of the blood-sucking insect, Triatoma infestans, was analyzed at various times after a short heat shock with or without subsequent moderate fasting. Cell death DNA fragmentation was studied immunocytochemically. Normal phenotypes and phenotypes indicative of cell survival (heterochromatin decondensation, nuclear fusion) and death (apoptosis, necrosis) were observed, especially in heat-shocked specimens. While the number of total and normal nuclei decreased following heat shock, the frequency of apoptosis increased during a short period (7 days) after heat shock. During a 30-day period following heat shock, the frequency of necrosis in fasted but not in fully nourished nymphs increased simultaneously with a decrease in the frequency of apoptosis. This finding suggests that the stress promoted by heat shock, but not that associated with heat shock plus fasting, can be dealt with by the apoptosis program. When considering the forms of cell survival, heterochromatin decondensation was more relevant in fully nourished nymphs, whereas nuclear and cell fusions were more important in fasted specimens. The forms of cell survival and cell death reported here may have protected the organ from damage by the stressing agents. In cells with no induction or accumulation of heat-shock proteins, cell death and the forms of cell survival observed here were the probable consequence.Key words: heat shock, fasting, apoptosis, necrosis, cell survival, Triatoma infestans. |
| Databáze: | OpenAIRE |
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