Previous studies suggested that p16 was crucial for long-term maintaining of senescence of both human fibroblasts [ 1, 13, 43] and HSC [ 14].
By contrast, our results indicate that elevated p38/MK-2 actination in response to H2O2 was persisted for a long time that suggests the importance of p38/MK-2 pathway in the control of both induction and a long-term maintaining of hMESCs senescence.
Over the long term, however, maintaining prosperity in the face of population loss may be difficult.
Thus our study highlights the long term challenge of maintaining any reduction in drug use.
When used as co-therapy in this setting, allopurinol is continued long term to maintain a desirable profile of 6MMP 6TGN.
It is clear that in some places, whether in the short or long term, seeking to maintain the resilience of current systems in their current states could becoming increasingly costly or untenable, presenting site managers with difficult decisions to make.
According to couple's therapist, John Jacobs, M.D., "the single greatest weapon in the battle to ensure the survival of a long term relationship is maintaining awareness of the fragility of the marital bond".
Tetrahymena is the well known exception to the inability to maintain long term cultures of ciliates in the absence of sex [ 8].
It appears that Zeb1/δEF1 maintains long term repression of E-cadherin initiated by Snail1, as suggested by others previously [ 10, 15].
Whole fibronectin has been reported to maintain long term cultures of OCT4 positive hPSCs capable of in vitro differentiation into the three germ layers and/or teratoma formation in MEF-conditioned [ 66] or heavily supplemented serum-free media [ 48] and also in several chemically-defined media [ 6, 67, 68].
This mechanism of population control although negative for the short term prevalence of the clone might be good for its long term survival since it maintains the complexity of the community and its endurance.
