NDLI: Epithelial cells release proinflammatory cytokines and undergo c-myc-induced apoptosis on exposure to filarial parasitic sheath protein-Bcl2 mediates rescue by activating c-H-ras

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Epithelial cells release proinflammatory cytokines and undergo c-myc-induced apoptosis on exposure to filarial parasitic sheath protein-Bcl2 mediates rescue by activating c-H-ras

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Epithelial cells release proinflammatory cytokines and undergo c-myc-induced apoptosis on exposure to filarial parasitic sheath protein-Bcl2 mediates rescue by activating c-H-ras

Content Provider	Springer Nature Link
Author	Krishnamoorthy, B. Narayanan, K. Miyamoto, S. Balakrishnan, A.
Copyright Year	2000
Abstract	Circulating filarial proteins elicit strong immunologic reactions in humans leading to the chronic manifestations in human lymphatic filariasis such as lymphatic occlusion, fibrosis, edema, and in some cases, tropical pulmonary eosinophilia. Our earlier studies, in vitro, conclusively prove that filarial parasitic sheath proteins induce apoptosis in HEp2 cells, an epithelial cell line, by a pathwa inhibitable by bcl2. The present findings provide evidence that c-myc activation triggers apoptosis in HEp2 cells and that it is also responsible for the burst of abortive proliferation at 6 d of treatment of HEp2 bcl2 cells that overexpress bcl2, with filarial parasitic sheath protein, demonstrating the interplay between the two genes c-myc and bcl2, wherein bcl2 acts by restoring the prosurvival signal to c-myc and keeping its apoptotic tendency in check. This study also indicates that bcl2 upregulates c-H-ras, engaring ras to bring about the suppression of apoptosis through protein tyrosine kinase elevation, thus promoting the survival of the HEp2 bcl2 cells. In addition to the activation of these “signal switches,” we also observe that these cells release cytokines like IL-6 and IL-8 through the upregulation of c-fos, when exposed to filarial parasitic sheath protein, reflecting on the immunomodulatory capacity of the epithelium to elicit a host immune response by setting up a chemotactic gradient, attracting inflammatory cells to the site of infection.
Starting Page	532
Ending Page	538
Page Count	7
File Format	PDF
ISSN	10712690
Journal	In Vitro Cellular & Developmental Biology - Animal
Volume Number	36
Issue Number	8
e-ISSN	1543706X
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	apoptotic signaling pathogenesis interleukins proto-oncogenes tyrosine kinase Cell Biology Developmental Biology Animal Genetics and Genomics Animal Biochemistry Animal Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Developmental Biology Medicine

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