This DNA hypermethylation might help prevent the spreading of activating histone modifications from the central region of HOXA and HOXC gene clusters to their periphery.
Thus, TNF-alpha can also provide a negative feedback loop to slow-down the spread of microglia activated by IFN-gamma.
Hence, greater initial activation will result in a greater spread of activation from that initially activated node to other nodes, including those with weaker direct or indirect connections to the initially activated node.
Given the high concentrations of CaMKII in synapses and the fact that calmodulin is limiting (Liu and Storm, 1990; MacNicol and Schulman, 1992; Persechini and Stemmer, 2002), subunit exchange provides a potential mechanism for increasing the spread of activation caused by an initial activating pulse.
Cytokines and chemokines produced by senescent cells appear to be capable of activating adaptive and innate immune responses that could spread cellular senescence locally and systemically.
There are two ways of activating NMDARs.
As much as I want to come up with a higher intention of "spreading love, activating my chakras, and sending positive energy, while riding a unicorn across a rainbow of butterflies," I decide that in light of my present circumstances I just want a Photoshopped butt.
Together, these results indicate that the proteins encoded by the Rap1 retrogenes have different biological activities, and uncouple cell adhesion and cell spreading, possibly by activating distinct (sets of) Rap1 effectors.
Chondroitin sulfate is able to induce FGF-2-mediated controloliferation, cellrol cell adhesion, and stimulate cell spreading and migration by activating focal adhesion of growth factor [ 28, 29].
Of these transcription factors, some activate and others repress TPE while others contribute to boundary activity, which limits the spread of silencing.
