BACKGROUND: Bifidobacteria are a natural part of the bacterial flora in the human body and have a symbiotic bacteria-host relationship with human beings. Aging is associated with reduced number of beneficial colonic bifidobacteria and impaired immunity. Lipoteichoic acid is a major constituent of the cell wall of bifidobacteria which is important for bacterial survival, growth, and function. The possible anti-aging effects of lipoteichoic acid isolated from bifidobacteria is presently unknown. OBJECTIVE: The aim of the present study was to investigate possible anti-aging effects of lipoteichoic acid isolated from bifidobacteria on senescent mice artificially induced by chronic injection of d-galactose and explore potential anti-aging's mechanisms. METHODS: Mice were artificially induced senescence by consecutive injection of d-galactose (100mg/kg) once daily for 7weeks and lipoteichoic acid from bifidobacterium bifidum, was simultaneously administered to them once a week by intraperitoneal infusion. Mice were sacrificed, blood and other samples were collected at the indicated time. Anti-oxidation activity in brain, histology of tissue, gene expression, lymphocyte's DNA damage and cytokine production of lymphocytes in vitro and in vivo were measured. RESULTS: Lipoteichoic acid could significantly improve general appearance of the aging model mice, improve anti-oxidation activity in brain, increase IL-2 level and decrease TNF-alpha level in vitro and in vivo, respectively. Besides, LTA remarkably inhibited DNA damage in the both splenic lymphocytes and circulating lymphocytes. Moreover, LTA could decrease p16 expression while increase c-fos expression in the d-galactose treated mice. CONCLUSION: Taken together, the results indicated, for the first time, that LTA could suppress the aging process via the following several mechanisms, including enhancement of anti-oxidation activity in brain, improvement of immune function and alteration of gene expression.
BACKGROUND: Bifidobacteria are a natural part of the bacterial flora in the human body and have a symbiotic bacteria-host relationship with human beings. Aging is associated with reduced number of beneficial colonic bifidobacteria and impaired immunity. Lipoteichoic acid is a major constituent of the cell wall of bifidobacteria which is important for bacterial survival, growth, and function. The possible anti-aging effects of lipoteichoic acid isolated from bifidobacteria is presently unknown. OBJECTIVE: The aim of the present study was to investigate possible anti-aging effects of lipoteichoic acid isolated from bifidobacteria on senescent mice artificially induced by chronic injection of d-galactose and explore potential anti-aging's mechanisms. METHODS:Mice were artificially induced senescence by consecutive injection of d-galactose (100mg/kg) once daily for 7weeks and lipoteichoic acid from bifidobacterium bifidum, was simultaneously administered to them once a week by intraperitoneal infusion. Mice were sacrificed, blood and other samples were collected at the indicated time. Anti-oxidation activity in brain, histology of tissue, gene expression, lymphocyte's DNA damage and cytokine production of lymphocytes in vitro and in vivo were measured. RESULTS:Lipoteichoic acid could significantly improve general appearance of the aging model mice, improve anti-oxidation activity in brain, increase IL-2 level and decrease TNF-alpha level in vitro and in vivo, respectively. Besides, LTA remarkably inhibited DNA damage in the both splenic lymphocytes and circulating lymphocytes. Moreover, LTA could decrease p16 expression while increase c-fos expression in the d-galactose treated mice. CONCLUSION: Taken together, the results indicated, for the first time, that LTA could suppress the aging process via the following several mechanisms, including enhancement of anti-oxidation activity in brain, improvement of immune function and alteration of gene expression.
Authors: Mehtab Khan; Rahat Ullah; Shafiq Ur Rehman; Shahid Ali Shah; Kamran Saeed; Tahir Muhammad; Hyun Young Park; Myeung Hoon Jo; Kyonghwan Choe; Bart P F Rutten; Myeong Ok Kim Journal: Cells Date: 2019-08-19 Impact factor: 6.600