Genomeweb today reports Sidney Brenner (Nobel Prize winner 2002 and pioneer in the use of Caenorhabditis elegans as a model organism) speaking on a conference. These days heâ€™s pushing a new model organism: humans.
â€œWe donâ€™t have to look for a model organism anymore,â€ Brenner said. â€œBecause we are the model organisms.â€
A new paper – the second bioinfomatics approach following the groundbreaking work by Perez-Iratxeta – is now coming up with some interesting remarks beyond IL-13 and TGF-ß1 Continue reading Where is the asthma gene?
A new series of pro- and con editorials in the Am J Res Crit Care Med discusses the question why in some instances mouse models have “misdirected resources and thinking”. You may have noticed that I have only rarely used animals for research; the authors of this editorial have collected empirical data on the exploding use of murine models. Despite their attractiveness from a technological point, they are useless because
- mice do not have asthma as even the most hyperresponsive strain does not show spontaneous symptoms
- mice do not have allergy – although sensitization can be manipulated by high intraperitoneal allergen/adjuvant injection, this does not involve immediate and late airway obstruction.
- immune reaction in mice is quite different – the interfering of some substances like vitamin D cannot be reliable tested, there is no pure Th1 and Th2 reaction in human and less stronger IL-13 response
- mice typically can not be challenged with the complex (and interacting) human exposure – oxidant stress, viral infection, obesity, diet, smoke, pollutants, ….
- time course is difficult to mimicking in the mouse, there is no longterm model
- structure of mouse airways is different – there are fewer airway generations, much less hypertrophy of smooth muscle
- inflammation in mouse is parenchymal rather than restricted
- humans are outbred, mice are inbred
- many promising interventions of mice pathways failed in humans (VLA-4, IL4, IL5, bradykinine, PAF,…)
I am sure there are even more arguments – I suggest that the authors have deserved the Felix-Wankel price.
15 Dec 06: The BMJ has 6 more examples about the discordance between animal and human studies: steroids in acute head injury, antifibrinolytics in haemorrhage, thrombolysis or tirilazad treatment in acure ischaemic stroke, antenatal steroids to prevent RDS and biphosphonate to treat osteoporosis.
19 Dec 06: Another pitfall paper
31 Dec 06: A blog on animal welfare
25 Apr 07: Call for better mouse models