Mitogen-activated protein kinase signalling and ERK1/2 bistability in asthma
Article first published online: 1 DEC 2010
© 2010 Blackwell Publishing Ltd
Clinical & Experimental Allergy
Volume 41, Issue 2, pages 149–159, February 2011
How to Cite
Alam, R. and Gorska, M. M. (2011), Mitogen-activated protein kinase signalling and ERK1/2 bistability in asthma. Clinical & Experimental Allergy, 41: 149–159. doi: 10.1111/j.1365-2222.2010.03658.x
- Issue published online: 13 JAN 2011
- Article first published online: 1 DEC 2010
Cite this as: R. Alam and M. M. Gorska,Clinical & Experimental Allergy, 2011 (41) 149–159.
Mitogen-activated protein kinases (MAPKs) integrate signals from numerous receptors and translate these signals into cell functions. MAPKs are critical for immune cell metabolism, migration, production of pro-inflammatory mediators, survival and differentiation. We provide a concise review of the involvement of MAPK in important cells of the immune system. Certain cell functions, e.g. production of pro-inflammatory mediators resolve quickly and may require a transient MAPK activation, other processes such as cell differentiation and long-term survival may require persistent MAPK signal. The persistent MAPK signal is frequently a consequence of positive feedback loops or double negative feedback loops which perpetuate the signal after removal of an external cell stimulus. This self-perpetuated activation of a signalling circuit is a manifestation of its bistability. Bistable systems can exist in ‘on’ and ‘off’ states and both states are stable. We have demonstrated the existence of self-perpetuated activation mechanism for ERK1/2 in bronchial epithelial cells. This sustained activation of ERK1/2 supports long-term survival of these cells and primes them for cytokine transcription. ERK1/2 bistability arises from repetitive stimulation of the cell. The repeated stimulation (e.g. repeated viral infection or repeated allergen exposure) seems to be a common theme in asthma and other chronic illnesses. We thus hypothesize that the self-perpetuated ERK1/2 signal plays an important role in the pathogenesis of asthma.