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胎牛血清和血清蛋白組分對脂質(zhì)體的磷脂酰膽堿的攝取作用由大鼠肝細(xì)胞原代單層培養(yǎng)2016-09-27 14:27
締一生物研究報告:我們研究了選自由磷脂酰膽堿,膽固醇和聯(lián)十六烷基磷酸鹽的磷脂囊泡的相互作用胎牛血清和血清蛋白的級分的作用(摩爾比7:2:1),其中在一個主單層培養(yǎng)大鼠肝實質(zhì)細(xì)胞。 這樣囊泡與標(biāo)記的磷脂酰膽堿的胎牛血清部分的溫育過程中被轉(zhuǎn)移到類似于我們先前鑒定為高密度脂蛋白(Scherphof,G,Roerdink,F(xiàn)H,韋特,M。和公園的衍生物的一個脂蛋白粒子,J。(1978)生物化學(xué)生物生物物理學(xué)報542,296-307)。當(dāng)如此形成的粒子與細(xì)胞一起孵育時觀察到的磷脂標(biāo)簽的轉(zhuǎn)移到細(xì)胞中。 當(dāng)囊泡與血清這種脂蛋白介導(dǎo)的脂質(zhì)轉(zhuǎn)移的存在下將細(xì)胞溫育可以設(shè)想有助于所觀察到的總脂質(zhì)攝取。然而,我們發(fā)現(xiàn),胎牛血清的培養(yǎng)基中的存在大大降低,而不是提高脂質(zhì)體的脂質(zhì)的總轉(zhuǎn)移到細(xì)胞中。還牛血清白蛋白和牛β球蛋白減少這種轉(zhuǎn)變中,雖然比全血清程度較輕。α-球蛋白,另一方面,分別為在降低脂質(zhì)體磷脂的攝入完整血清一樣有效。一個γ球蛋白餾分未能顯示出在[14 C]膽堿,由細(xì)胞攝取的任何影響。 這能夠抑制脂質(zhì)體磷脂的細(xì)胞攝取所有蛋白質(zhì)的級分顯示出結(jié)合到磷脂囊泡。此外,脂質(zhì)囊泡預(yù)溫育有胎牛血清,然后從中分離出顯示減少標(biāo)記的磷脂酰膽堿轉(zhuǎn)移至實質(zhì)細(xì)胞。 這些觀察被帶到表明脂質(zhì)體的脂質(zhì)的減弱攝取可以通過如結(jié)合某些血清蛋白的結(jié)果的脂質(zhì)體表面的膜的變形而引起。 英文原文: We studied the effect of fetal calf serum and serum protein fractions on the interaction of phospholipid vesicles consisting of phosphatidylcholine, cholesterol and dicetylphosphate (molar ratio 7 : 2 : 1), with rat liver parenchymal cells in a primary monolayer culture. During incubation of such vesicles with fetal calf serum part of the labeled phosphatidylcholine is transferred to a lipoprotein particle similar to the one we identified previously as a derivative of high density lipoprotein (Scherphof, G., Roerdink, F.H., Waite, M. and Parks, J. (1978) Biochim. Biophys. Acta 542, 296–307). When the particle thus formed is incubated with the cells a transfer of the phospholipid label to the cells is observed. When vesicles are incubated with the cells in presence of serum such lipoprotein-mediated lipid transfer may conceivably contribute to the total lipid uptake observed. |