| 5 | Silica Induced Early Fibrogenic Reaction in Lung of Mice Ameliorated by Nyctanthes arbortristis Extract显示文摘Objective To investigate the pharmacological effect of Nyctanthes arbortristis (NAT) leaf extract in the prevention of lung injury induced by silica particles. Method Lung injury was induced in Swiss mice through inhalation exposure to silica particles (<5m) using a Flow Past Nose Only Inhalation Chamber at the rate of -10 mg/m3 respirable mass for 5 h. Lung bronchoalveolar lavage (BAL) fluid collected between 48 and 72 h was subjected to protein profiling by electrophoresis and cytokine evaluation by solid phase sandwich ELISA. Lung histopathology was performed to evaluate lung injury. Results Inhalation of silica increased the level of tumor necrosis factor-a (TNF-a), and of the 66 and 63 kDa peptides in the BAL fluid in comparison to sham-treated control. Pre-treatment of silica exposed mice with NAT leaf extract significantly prevented the accumulation of TNF-a in the BAL fluid, but the 66 and 63 kDa peptides remained unchanged. The extract was also effective in the prevention of silica-induced early fibrogenic reactions like congestion, edema and infiltration of nucleated cells in the interstitial alveolar spaces, and thickening of alveolar septa in mouse lung. Conclusion NAT leaf extract helps in bypassing silica induced initial lung injury in mice. | BHOLA NATH PAUL*,1, ANAND PRAKASH*, SIRISH KUMAR*, AJAY K. YADAV*, U. MANI+, ASHOK K. SAXENA*, ANAND PRAKASH SAHU#, KEWAL LAL+, AND KALYAN K. DUTTA+ *Immunobiology Laboratory +Inhalation Toxicology Laboratory #Preventive Toxicology Laboratory Industrial Toxicology Research Centre, M.G.Marg, Lucknow 226001, U.P. India | 2002 | Biomedical and Environmental Sciences2002，15，3： | 1 |
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