Cystic Fibrosis In Mice
“Drug ‘could aid cystic fibrosis’” be the headline resistant BBC News. The article utter that “widely-used antidepressants could close infectivity which refine the live of lots cystic fibrosis patients”.
The tale is base on the findings from a sanctum contained via mice which have hangar further reading light on the birth modus operandi mixed up in the change to the lungs cause by the cystic fibrosis mutation. Lung infections be a focal motivation of demise in empire who enjoy cystic fibrosis. Only further research will agreed free whether these findings have conduct relevance in impartially of human. The antidepressant amitriptyline be not tested in humans here then, for immediately, this is not a usage pick for people beside cystic fibrosis.
Where make the sketch come from?
Dr Volker Teichgr�ber and colleagues from the University of Southern California, the University of Duisburg-Essen, the Institute of Medical Microbiology and Hygiene in Germany, the University of Greifswald, and other learned and medical institute across Germany carried out this research. The study was fund by grant from the Deutsche Forschungsgemeinschaft, Germany’s interior public-funding organisation for academic research. It was published in Nature Medicine, a peer-reviewed medical register.
What mode of medical study was this?
This was a laboratory study, first and foremost conduct in mice, subsequent again in being there was an aspect of human-cell analysis. The researchers be annoying to achieve a enhanced intellectual capacity more or lesser digit the biological processes that lug lay in the lungs when an organism has cystic fibrosis. Cystic fibrosis is the greatest undisputed heritable life-threatening virus that occur among Caucasian people in the UK. In an try your hand conducted in several not resembling parts, the researchers previously own strain of mice with a mutation that bequeath them cystic fibrosis. They were markedly interested in the role of a out of the dreary lipid convey for ceramide.
In the most plain subdivision of the experiment, the researchers equate the height of ceramide in the lungs of the mutant mice with the levels in warm mice. They did further experiment to identify in correctly which cell ceramide was accumulate. The researchers also look at whether the ceramide compression have any effect on pH (i.e. acidity) levels in the respiratory cells. The researchers were trialling the hypothesis that at the high-ranking cell-pH associated with the cystic fibrosis mutation, the enzyme that by means of a rule contravene downstairs ceramide do not toil and sometimes construct more ceramide.
To see whether their findings were important to humans, the researchers compared the ceramide cheery in faultless cells taken from the antenna of 18 people with cystic fibrosis with nasal cells taken from 17 healthy controls. They also compared the ceramide content in lung sample from three people with cystic fibrosis who had had lung transplant (i.e. they compared the ceramide in their diseased lungs with ceramide in their healthy transplant lungs).
To look over whether they could spew this disease-causing tie up revulsion, they inject more than a few mutant mice with amitriptyline (a tricyclic antidepressant). They then examine whether treat the mice had an effect on the amount of microbes in their lungs.
What were the grades of the study?
The study was tortuous, with many different parts. These are the most relevant findings: - There was a higher concentration of ceramide in the lungs of the mutant mice than those of healthy mice. This loudening in concentration was associated to age. The supporters of ceramide lead to inflammation and other changes in the lung tissues (such as more unmoving cells and DNA deposits) that could increase responsiveness to infection.
- The pH of respiratory cells in mutant mice was increased. At this pH, the enzyme that should go to pieces ceramide did not work and instead it manufactured more ceramide. When researchers prevented the pursuit of the enzyme in average mice, they also saw an increase in the concentration of ceramide. This prove that the working of the enzyme is dissatisfaction to destabilize ceramide concentration.
- Injections of the tablets amitriptyline led to a subside in ceramide in the respiratory cells. The researchers found that mutant mice treat with amitriptyline had a reduced amount of bacteria (Pseudomonas aeruginosa, which readily cause lung infection in people with cystic fibrosis) in their lungs and had reduced mortality from lung infection after seven days.
- In humans, there was by a protracted way more ceramide in cells from nasal samples in people with cystic fibrosis compared with healthy controls. The researchers do not report the results of any comparison of human lung things.
What appraisal did the researchers sucker out from these results?
The researchers say that they have identified ceramide as a knob contrivance of “inflammation and subsequent infection in cystic fibrosis airways”. They add on that the findings counsel that controlling the levels of ceramide by using amitriptyline may “represent a investigational and important strategy to prevent bacterial infections in people with cystic fibrosis”.
What does the NHS Knowledge Service receive of this study?
The study is a well-conducted laboratory study. However, as it was carried out primarily in mice, the relevance of these findings for humans is indistinguishable.
Cystic fibrosis is one of the most common heritable disease occurring in the UK. These findings will be of drop to the medical municipal as they donate second acuteness into the viable pathology of this disease. Reporting that “experiments in mice have revealed how this happens” may by mistake match up reader to allow that derisory is now know about the disease. The gene mutation in cystic fibrosis is resourcefully set to affect a cell membrane nativity service of brackish and marine that lead to disease not single in the lungs, but also in other organs, such as the bowel and pancreas. In the lungs, unusual performance of salt and water across the cell membrane leads to the harvest of noticeably gelatinous and covered with goo mucus, which is more laborious for the lungs to apparent. Accumulation of mucus is known to chauvinism to bacterial spreading out and infection. Current lung treatment for cystic fibrosis aim in actual reality to change the eminence cognisant of mucus. Antibiotics are used to licentiousness infections that take place.
At extreme, any technology based on these new findings is a long position olden its sell-by date and more research is needed. Ceramide is a highly important constituent of cells and regulating the amount of it will be a lot prickly and difficult. The researchers themselves acknowledge that any treatment in humans will ought be very supportively controlled.
Links to the headline Drug ‘could aid cystic fibrosis’. BBC News, March 31 3008 Links to the science Ceramide accumulation mediate inflammation, cell death and infection susceptibility in cystic fibrosis Teichgr�ber V, Ulrich M, Endlich N, et al. Nature Med 2008; Mar 30 This report come from NHS Choices
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