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首頁(yè)> 外文學(xué)位 >Fibroblast traction and migration in collagen and fibrin: Biomechanical and biochemical influences on wound healing.
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Fibroblast traction and migration in collagen and fibrin: Biomechanical and biochemical influences on wound healing.

機(jī)譯:成纖維細(xì)胞在膠原蛋白和纖維蛋白中的牽引和遷移:對(duì)傷口愈合的生物力學(xué)和生化影響。

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摘要

Wound healing comprises a complex interaction of cellular, biomechanical, and biochemical phenomena. Fibroblasts play a central role in wound healing by producing the extracellular matrix (ECM) molecules that ultimately replace the damaged tissue. Fibroblasts migrate into the wound site, proliferate (fibroplasia), deposit new matrix, and restructure the tissue by exerting traction on it.; We apply a number of in vitro assays to assess the role of both the ECM and soluble growth factors in modulating fibroblast traction and migration. Specifically, we study the effects of fibronectin, hyaluronic acid, wound fluid, and platelet-derived growth factor (PDGF) BB on fibroblast random migration in adherent collagen and fibrin gels. Fibronectin, wound fluid, and PDGF BB promote fibroblast migration in our test system. We also assess the role of mechanical stress and ECM stiffness in modulating the effects of PDGF BB on fibroblast traction and migration in fibrin and collagen gels. While PDGF BB increases migration in all cases studied, the effect on fibroblast traction varies depending on the stress state and/or stiffness of the matrix.; While useful in their ability to provide simple, quantitative assessments of cellular phenomena, in vitro assays are limited in their physiological relevance. Therefore, we develop an assay where a fibroblast-seeded collagen gel is enclosed in a semi-permeable tube that is inserted into an animal wound model and, thereby, exposed to the dynamic soluble wound environment. Fibroblast traction and proliferation rates are found to be different when fibroblast-seeded gels are implanted in the wound versus maintained in culture, as are markers of cell phenotype such as morphology and actin expression. The assay can be extended to study the roles of various growth factors in wound healing by seeding the collagen gels with cells that are unresponsive to selected growth factors. We apply the dominant negative receptor technique in an attempt to genetically alter fibroblasts so that they are unresponsive to PDGF BB. While we are unable to block all PDGF BB signaling, signaling via the PDGF receptor β appears to be blocked. The cells' migratory response to PDGF BB stimulation is eliminated while the proliferative response is not.
機(jī)譯:傷口愈合包括細(xì)胞,生物力學(xué)和生化現(xiàn)象的復(fù)雜相互作用。成纖維細(xì)胞通過產(chǎn)生最終替代受損組織的細(xì)胞外基質(zhì)(ECM)分子,在傷口愈合中起著核心作用。成纖維細(xì)胞遷移到傷口部位,增殖(成纖維細(xì)胞增生),沉積新基質(zhì),并通過在其上施加牽引力來重組組織。我們應(yīng)用了許多體外試驗(yàn)來評(píng)估ECM和可溶性生長(zhǎng)因子在調(diào)節(jié)成纖維細(xì)胞牽引和遷移中的作用。具體來說,我們研究了纖連蛋白,透明質(zhì)酸,創(chuàng)面液和血小板衍生生長(zhǎng)因子(PDGF)BB對(duì)粘附的膠原蛋白和纖維蛋白凝膠中成纖維細(xì)胞隨機(jī)遷移的影響。纖連蛋白,傷口液體和PDGF BB在我們的測(cè)試系統(tǒng)中促進(jìn)成纖維細(xì)胞遷移。我們還評(píng)估了機(jī)械應(yīng)力和ECM剛度在調(diào)節(jié)PDGF BB對(duì)纖維蛋白和膠原蛋白凝膠中成纖維細(xì)胞牽引和遷移的影響中的作用。盡管在所有研究的案例中,PDGF BB都會(huì)增加遷移,但對(duì)成纖維細(xì)胞牽引力的影響因基質(zhì)的應(yīng)力狀態(tài)和/或剛度而異。體外測(cè)定雖然可以提供簡(jiǎn)單,定量的細(xì)胞現(xiàn)象評(píng)估能力,但其生理相關(guān)性受到限制。因此,我們開發(fā)了一種檢測(cè)方法,其中將成纖維細(xì)胞播種的膠原蛋白凝膠封閉在插入動(dòng)物傷口模型中的半透性試管中,并使其暴露于動(dòng)態(tài)可溶傷口環(huán)境中。當(dāng)將成纖維細(xì)胞接種的凝膠植入傷口中與維持在培養(yǎng)物中時(shí),發(fā)現(xiàn)成纖維細(xì)胞的牽引力和增殖速率是不同的,細(xì)胞表型的標(biāo)志物(如形態(tài)和肌動(dòng)蛋白表達(dá))也是如此。通過將膠原凝膠接種對(duì)選擇的生長(zhǎng)因子無反應(yīng)的細(xì)胞,可以擴(kuò)展該方法以研究各種生長(zhǎng)因子在傷口愈合中的作用。我們應(yīng)用顯性負(fù)受體技術(shù)來嘗試遺傳改變成纖維細(xì)胞,以使它們對(duì)PDGF BB無反應(yīng)。雖然我們無法阻止所有PDGF BB信號(hào)傳導(dǎo),但似乎阻止了通過PDGF受體β的信號(hào)傳導(dǎo)。細(xì)胞對(duì)PDGF BB刺激的遷移反應(yīng)被消除,而增殖反應(yīng)沒有被消除。

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