Cell proliferation and apoptosis: dual-signal hypothesis tested in tuberculous pleuritis using mycobacterial antigens

Das, Sulochana D.; Subramanian, Deepa and Prabha, C. (2004) Cell proliferation and apoptosis: dual-signal hypothesis tested in tuberculous pleuritis using mycobacterial antigens. FEMS Immunology and Medical Microbiology, 41. pp. 85-92. ISSN 0928-8244

Full text available as:

PDF - Registered users only - Requires Adobe Acrobat Reader or other PDF viewer.
360 Kb

Abstract

Antigens and mitogens have the innate ability to trigger cell proliferation and apoptosis thus exhibiting a dual-signal phenomenon. This dual-signal hypothesis was tested with mycobacterial antigens (PPD and heat killed Mycobacterium tuberculosis –MTB) in tuberculous pleuritis patients where the immune response is protective and compartmentalized. We compared and correlated the cell-cycle analysis and antigen-induced apoptosis in normal and patients peripheral blood mononuclear cells (PBMCs) and patients pleural fluid mononuclear cells (PFMCs). In cell-cycle analysis, PFMCs showed good mitotic response with PPD and MTB antigens where 10% and 7% of resting cells entered the S and G2/M phases of cell cycle, respectively. This antigen-induced proliferation of PFMCs correlated well with the lymphocyte transformation test (LTT) results. On the other hand, PFMCs also showed 21% of spontaneous apoptosis, which further increased to 43%, by induction with known apoptotic agent like Dexamethasone (DEX) and the mycobacterial antigens PPD and MTB. Further we demonstrated by anti-CD3 induction experiments that prior activation of cells is prerequisite for them to undergo apoptosis. Our results showed that PPD and MTB antigens induced both cell proliferation and apoptosis in PFMCs, which were presensitized to mycobacterial antigens in vivo. Thus the dual-signal phenomenon was operative against these antigens in tuberculous pleuritis. We also demonstrated that the activated cells are more predisposed to apoptosis.

EPrint Type:Article
Uncontrolled Keywords:Apoptosis; Tuberculous pleuritis; Cell proliferation; Mycobacterial antigens
Subjects:Biological Phenomena, Cell Phenomena, and Immunity > Cell Physiology
Immunologic and Biological Factors > Immunologic Factors > Antigens
Respiratory Tract Diseases > Pleural Diseases > Tuberculosis, Pleural
ID Code:179
Deposited By:Dr Sulochana D.
Deposited On:04 July 2005

Archive Staff Only: edit this record