The growth of asbestos induced disease will differ dependant upon several critical factors. One interesting study that examines this problem is named, “Asbestos-induced phosphorylation of epidermal growth factor receptor is linked to c-fos and apoptosis” by Christine L. Zanella, Cynthia R. Timblin, Andrew Cummins, Michael Jung, Jonathan Goldberg, Rachel Raabe, Thomas R. Tritton, and Brooke T. Mossman – Am J Physiol Lung Cell Mol Physiol 277 – Vol. 277, Issue 4, L684-L693, October 1999. The following is an excerpt: “We examined the mechanisms of interaction of crocidolite asbestos fibers while using epidermal growth factor (EGF) receptor (EGFR) as well as the role belonging to the EGFR-extracellular signal-regulated kinase (ERK) signaling pathway in early-response protooncogene (c-fos/c-jun) expression and apoptosis induced by asbestos in rat pleural mesothelial (RPM) cells. Asbestos fibers, and not the nonfibrous analog riebeckite, abolished binding of EGF for the EGFR. This is not a result of a direct interaction of fibers with ligand, inasmuch as binding studies using fibers and EGF even without the membranes established that EGF just didn’t adsorb towards the surface of asbestos fibers. Exposure of RPM cells to asbestos caused an even better than twofold improvement in steady-state message and protein stages of EGFR (P
The tyrphostin AG-1478, which inhibits the tyrosine kinase activity belonging to the EGFR, yet not the tyrphostin A-10, which does not affect EGFR activity, significantly ameliorated asbestos-induced increases in mRNA degrees of c-fos yet not of c-jun. Pretreatment of RPM cells with AG-1478 significantly reduced apoptosis in cells subjected to asbestos. Our findings suggest that asbestos-induced binding to EGFR initiates signaling pathways accountable for increased expression on the protooncogene c-fos along with the growth of apoptosis. The chance to block asbestos-induced elevations in c-fos mRNA levels and apoptosis by small-molecule inhibitors of EGFR phosphorylation could have therapeutic implications in asbestos-related diseases.” Another study is named, “Alveolar macrophage stimulation of lung fibroblast increase in asbestos-induced pulmonary fibrosis.” By I. Lemaire, H. Beaudoin, S. Mass, and C. Grondin – Am J Pathol. 1986 February; 122(2): 205-211. Suggestions an excerpt: “Abstract – Asbestotic lesions are observed as macrophagic accumulation, fibroblast proliferation, and collagen deposition. To confirm the actual possibility involvement of alveolar macrophages inside the subsequent fibrogenic reaction, the authors studied the unsightly effects of macrophages from normal and asbestos-treated rats upon lung fibroblast proliferation in vitro. Culture supernatants from bronchoalveolar (BAL) cells (99% macrophages) of normal rats stimulated lung fibroblast DNA synthesis and growth in a dose-dependent manner. Fibroblast growth factor (FGF) release by alveolar macrophages (AMs) was rapid (within Sixty minutes of incubation) and impacted by the volume of AMs in culture. Moreover, culture supernatants from BAL cells of animals come across asbestos (single intratracheal injection) stimulated fibroblast proliferation to the greater degree than culture supernatants from BAL cells of control animals. Enhanced FGF production occurred 7 days after asbestos instillation and persisted as much as 24 weeks.
This variation was accompanied as a result of stages (1-4 weeks) by a rise in the complete number of BAL cells which returned to stop values by 3 months. Differential analysis of BAL cell populations showed a transient infiltration of neutrophils in the bronchoalveolar compartment followed by a major accumulation of macrophages which persisted as much as Four weeks. Furthermore, lungs of asbestos-treated animals showed evidence of pathologic alterations seen as fibroblast proliferation and collagen deposition. This study signifies that increased creation of fibroblast growth factor by alveolar macrophages in vitro coincides together with the growth and development of asbestos-induced fibrosis. Prolonged stimulation of FGF release may give rise to excessive fibroblast proliferation and fibrosis.” If you found these excerpts, please read them with their entirety. The majority of us owe a debt of gratitude to those researchers. Monty Wrobleski may be the author i have told. To acquire more information please choose the following links Mesothelioma Lawsuit Settlements, Nephrogenic Systemic Fibrosis Lawsuit
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