However, acquired resistance develops partially due to activation or alterations of alternative signaling pathways including Src and Akt, which promote tumor progression.
Messenger RNA gene expression variation can be divided into two broad categories: differences in the overall mRNA level (due to transcriptional changes or mRNA stability) and alterations in the ratios of alternative transcripts.
Our results suggest that alteration of microtubule dynamics by alternative splicing may be an important pathogenetic mechanism in high stage neuroblastoma.
Alterations in the pattern and efficiency of alternative splicing of several pre-mRNAs (e.g. CD44, BRCA1, WT-1) have been implicated in tumorigenesis and correlate with tumour progression (Cooper and Dougherty, 1995; Liu et al, 2001).
Drug resistance is the result of diverse mechanisms, including an imbalance between drug influx and efflux, alterations in drug targets, and the activation of alternative pathways [8].
For transformation to succeed it will require increased recognition of the consequences associated with the current paradigm, social acceptance of alternative fire management strategies, and alteration of the culture of public agencies charged with wildfire suppression.
These alterations could include upregulation of activating ligands, downregulation of alternative inhibitory pathways [42], [43], or further downregulation of MHC class I.
Alterations of the TM domain, like in the case of alternative splicing-deleting exon 6, will cause reduced mFAS expression in the detriment of sFAS.
Oncogenic alterations often render cancer cells resistant to apoptosis, activation of alternative cell death pathways might therefore provide new therapeutic options.
Although some signs of neuronal death have been reported in these patients, they most likely do not explain the extent of cognitive alterations, suggesting alternative unknown mechanism altering neuronal functions.
