Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Bull+Math+Biol 2015 ; 77 (8): 1556-82 Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Identifying Mechanisms of Homeostatic Signaling in Fibroblast Differentiation #MMPMID26384829
Warsinske HC; Ashley SL; Linderman JJ; Moore BB; Kirschner DE
Bull Math Biol 2015[Aug]; 77 (8): 1556-82 PMID26384829show ga
Fibroblasts play an important role in the wound-healing process by generating extracellular matrix (ECM) and undergoing differentiation into myofibroblasts, but these cells can also be involved in pathologic remodeling of tissue. Nascent ECM provides a substrate for re-epithelialization to occur, restoring damaged tissue to a functional state. Dysregulation of this process can result in fibrosis?stiffening and scarring of the tissue. Current treatments cannot halt or reverse this process. The molecular mechanisms underlying fibrotic dysregulation are poorly understood, providing an untapped pool of potential therapeutic targets. Transforming growth factor-? (TGF- ?) and adhesion signaling are involved in inducing fibroblast differentiation into ?-smooth muscle actin (? SMA) expressing myofibroblasts, while prostaglandin E2 (PGE2) has been shown to antagonize TGF ? signaling; however, the temporal and mechanistic details of this relationship have not yet been fully characterized. We measured ? SMA, a marker of fibroblast to myofibroblast differentiation, as a function of: TGF-?1 receptor?ligand complex internalization, PGE2 binding, and adhesion signaling and developed a mathematical model capturing the molecular mechanisms of fibroblast differentiation. Using our model, we predict the following: Periodic dosing with PGE2 temporarily renders fibroblasts incapable of differentiation and refractory to additional TGF-?1 stimulation; conversely, periodic dosing with TGF-?1 in the presence of PGE2 induces a reduced signal response that can be further inhibited by the addition of more PGE2. Controlled fibroblast differentiation is necessary for effective wound healing; however, excessive accumulation of ? SMA-expressing myofibroblasts can result in fibrosis. Homeostasis of ? SMA in our model requires a balance of positive and negative regulatory signals. Sensitivity analysis predicts that PGE2 availability, TGF-?1 availability, and the rate of TGF-?1 receptor recycling each highly influence the rates of ? SMA production. With this model, we are able to demonstrate that regulation of both TGF-?1 and PGE2 signaling levels is essential for preventing fibroblast dysregulation.
free
free
free
Bull+Math+Biol 2015 ; 77 (8): 1556-82
