Alzheimer's Disease and Frontotemporal Dementias

A Review with Particular Reference to Pin1 Protein

 

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Mitogen-Activated Protein Kinase (MAP kinase)

Please Note: Due to time constraints, the text part of this page has not been updated for some time. However, references are added reasonably frequently.


MAP kinases (mitogen-activated protein kinase; externally regulated kinase, [ERK1 and ERK2]) are a sub-family of the protein kinases (e.g. see Cobb et al., 1995).

MAP kinases are so termed because they are activated by mitogens and therefore potentially signal entry into the cell cycle. The MAP kinase pathway is one branch of the complex cellular regulatory machinery, the aberrant activation of which may contribute to the hyperphosphorylation of tau associated with AD. MAP kinases (Cobb et al., 1995) are serine-threonine kinases that have a significant role in hormonal signal transduction. They are activated by MAP kinase kinase (MAP kinase/ERK kinase: MEK). MEKs are highly specific for ERK1 and 2. MEKs are themselves activated by MEK kinase. The latter and MAP kinases are highly-expressed in the brain, with ERK1 mRNA apparently enriched in astrocytes and glia. ERK2 has been found in neuronal processes, tangles and plaques (Trojanowski et al., 1993). 

ERK1 is a 43kDa and ERK2 a 41kDa protein (they have c. 83% homology). They have a specificity (shared with cyclin-dependent kinase 2) for substrates with phosphorylated serine or threonine residues preceding a proline (they are thus serine-threonine kinases). The phosphorylation of both a tyrosine and a threonine (that lie one amino acid apart on each of the two enzymes) are required for activation of the highest MAP kinase activity. MAP kinases are regulated by autocrine and paracrine growth factors (e.g. nerve growth factor [NGF] and ciliary neurotrophic factor [CNTF]). These latter stimulate neuronal proliferation, development and differentiation.

The MAP kinases phosphorylate many key regulatory proteins such as other protein kinases, transcription factors (thereby act in the nucleus to alter gene expression; e.g. Egr1; Harada et al., 2001), membrane enzymes and cytoskeletal proteins (including tau ; Ferrer et al., 2001). It has also now been demonstrated  (in PC12 cells; Harada et al., 2001) that activation of the MAP kinase pathway by nerve growth factor induces p35, the neuron-specific activator of Cdk5 . This induction is mediated via the transcription factor Egr1. Significantly, MAP kinases can phosphorylate tau in up to 15 of the 17 Ser-Pro or Thr-Pro motifs of the largest human isoform and have been seen to be associated with complexes of tau (and neurofilament and tubulin proteins; Veeranna et al., 2000). A secreted fragment of the amyloid protein precursor (APP) can stimulate MAP kinase in a ras-dependent manner, leading to tau phosphorylation (Kosik et al., 1995). The results suggested an interaction of tau with actin in addition to microtubules . On this note, it has been suggested (Yuan and Yankner, 2000 ) that, in AD, amyloid fibrils may activate cell death signalling pathways involving the neurotrophins which regulate apoptosis via protein kinase cascades (inc. the MAP kinase pathway).
Inactivation of MAP kinases: see Phosphatases .
 
The 'Phosphorylation Cascade' involving the MAP kinases: this is quite well characterised in mammalian cells and is thought to proceed as follows:
Often initiated by activation of a tyrosine kinase receptor (e.g. EGF or PDGF)
This receptor activates the Ras pathway (via an adaptor protein)
The latter leads to activation of the Raf Ser/Thr kinase
Raf Ser/Thr kinase then activates MAP kinase kinase (or MEK)
As the name suggests, the latter phosphorylates a MAP kinase and the pathway leading from MEK through phosphorylation of a MAP kinase which in turn phosphorylates another such enzyme, etc.. is sometimes called the MAP kinase pathway.
The latter leads ultimately to the phosphorylation of transcription factors (triggering changes in cell growth or differentiation) or of cytoskeletal proteins .

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Some Related References

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