Mitogen-Activated Protein Kinases: Specific Messages from Ubiquitous Messengers

Signal transduction networks allow cells to perceive changes in the extracellular environment and to mount an appropriate response. Mitogen-activated protein kinase (MAPK) cascades are among the most thoroughly studied of signal transduction systems and have been shown to participate in a diverse array of cellular programs, including cell differentiation, cell movement, cell division, and cell death. A key question in studies of this cascade is, how does a ubiquitously activated regulatory enzume generate a specific and biologically appropriate cellular response? In this review we describe recent findings that provide insight into ways that the regulation, structure, and localization of MAPKs and the participation of adapters and scaffolds can help determine biological outcomes. MAPK cascades are evolutionarily conserved in all eucaryotes and play a key role in the regulation of gene expression as well as cytoplasmic activities. They typically are organized in a three-kinase architecture consisting of a MAPK, a MAPK activator (MEK, MKK, or MAPK kinase), and a MEK activator (MEK kinase [MEKK] or MAPK kinase kinase). Transmission of signals is achieved by sequential phosphorylation and activation of the components specific to a respective cascade. In the yeast Saccharomyces cerevisiae, five MAPK modules have been described; they regulate mating, filamentation, high-osmolarity responses, cell wall remodeling, and sporulation (Fig. ​(Fig.1A)1A) (reviewed in references 56 and 77). In mammalian systems five distinguishable MAPK modules have been identified so far (Fig. ​(Fig.1B). 1B). These include the extracellular signal-regulated kinase 1 and 2 (ERK1/2) cascade, which preferentially regulates cell growth and differentiation, as well as the c-Jun N-terminal kinase (JNK) and p38 MAPK cascades, which function mainly in stress responses like inflammation and apoptosis (reviewed in references 57, 74, and 103). Moreover, MAPK pathways control several developmental programs, such as morphogenesis and spatial patterning in Dictyostelium amoebae (17, 45), eye development in Drosophila melanogaster (124), vulva induction in Caenorhabditis elegans (113), and T-cell development in mammals (31). FIG. 1 Schematic overview of MAPK modules. (A) In S. cerevisiae, five MAPK modules regulate mating, filamentation, high-osmolarity responses, cell wall remodeling, and sporulation. (B) Mammalian MAPK modules regulate cell growth, differentiation, stress responses, . Individual MAPK modules generally can signal independently from each other, and this specificity is manifested in distinct physiologic responses. This is most obvious when studying MAPK signaling in S. cerevisiae. Here a particular extracellular event characteristically activates a specific MAPK module and initiates a unique cellular program (reviewed in references 56 and 77). For example, stimulation of cells with pheromone leads to the activation of the pheromone response pathway (STE11, STE7, and FUS3) (Fig. ​(Fig.2),2), which ultimately results in cell cycle arrest and the induction of mating-specific genes. However, related MAPKs whose modules share some components with the pheromone response pathway are not affected by pheromone stimulation but are activated only in response to the appropriate stimulus. For example, under conditions of high osmolarity Ste11 can lead to activation of Hog1 but does not induce mating-specific genes. Conversely, conditions that activate the filamentation pathway (which utilizes STE11 and STE7) induce only genes that regulate filamentous growth without triggering pheromone responses or responses to high osmolarity. These observations suggest that yeast cells have developed efficient mechanisms to generate pathway specificity and to successfully suppress cross talk, even when individual components participate in more than one signaling pathway. FIG. 2 Scaffold and adapter molecules in MAPK pathways. MAPK scaffolds and adapters (gray shading) are thought to promote the formation of oligomeric protein complexes with components that function in a specific MAPK module. Scaffolds have been identified in . In metazoan cells the problem is more complex because each cell is simultaneously exposed to multiple extracellular signals and must integrate these inputs to choose an appropriate response. Thus, the biological context of a signal plays a determinative role in the way that MAPK activation is interpreted. For example, although ERKs generally regulate cell growth and cell differentiation and JNKs participate in a stress response, this is not always the case and in certain cell types activation of JNKs can induce proliferation (110). This indicates that in mammalian systems physiologic responses associated with a certain MAPK module can be cell type specific. Moreover, in PC12 cells, transient stimulation of the ERK cascade leads to proliferation whereas sustained stimulation leads to differentiation, as measured by neurite outgrowth (81). Thus, activation of the ERK cascade can lead to contrasting physiological responses in the same cellular context, suggesting that signal specificity is also determined by regulatory mechanisms other than the selective activation of a MAPK module. In this short review, we outline recent advances in understanding of this signaling system that help to explain how MAPK cascades are regulated and how specificity can be generated. Because of the power of yeast genetics, understanding of MAPK signaling in S. cerevisiae is at an advanced level, and thus many examples that utilize this organism are given. However, analogous mechanisms appear to be operative in metazoans as well. We discuss in turn the role of enzyme-substrate interactions, scaffolding proteins, subcellular targeting and localization, temporal regulation, and signal integration in determining the biological outcome of MAPK activation.