Role of host's antitumor immunity in exercise-dependent regression of murine T-cell lymphoma.
We have reported that the ascitic growth of a transplantable T cell lymphoma of spontaneous origin, designated as Dalton's lymphoma (DL), is associated with a concomitant immunosuppression. We have also reported that progressive in vivo growth of DL resulted in an inhibition of macrophage functions. In present investigation we report that physical exercise by DL-bearing mice, on a treadmill on a daily basis for various time durations for 10 days, increased the life span along with an inhibition of tumor growth. A significant decrease in the volume of ascitic fluid and number of cells in the tumor was obtained in mice, which underwent exercise. DL cells obtained from exercised groups showed a decreased proliferation in vitro. An augmentation in the percent of cells showing apoptotic morphology and percent specific DNA fragmentation was observed, suggesting that physical exercise increased the incidence of apoptosis in tumor cells. Moreover, macrophages obtained from tumor-bearing mice, which underwent exercise training, showed an augmented tumoricidal activity and production of tumoricidal molecules like interleukin-1 (IL-1), tumor necrosis factor (TNF) and nitric oxide (NO). On the basis of this study it is suggested that the regression of tumor growth consequent to physical exercise training of tumor bearing host, may be due to an exercise-dependent augmentation of macrophage tumoricidal functions.
Singh
Mahendra Pal
MP
School of Biotechnology, Banaras Hindu University, Varanasi 221005, India.
Singh
Gajendra
G
Singh
Sukh Mahendra
SM
D000818:Animals; D017209:Apoptosis / Q000276:immunology; D049109:Cell Proliferation; D003601:Cytotoxicity Tests, Immunologic; D053938:DNA Fragmentation / Q000276:immunology; D007375:Interleukin-1 / Q000276:immunology; D016399:Lymphoma, T-Cell / Q000276:immunology*; D017737:Macrophages, Peritoneal / Q000276:immunology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009569:Nitric Oxide / Q000276:immunology; D010805:Physical Conditioning, Animal / Q000502:physiology*; D011897:Random Allocation; D013047:Specific Pathogen-Free Organisms; D016019:Survival Analysis; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology
D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha; D009569:Nitric Oxide