新生大鼠心肌细胞的原代培养及鉴定

目的：探讨新生大鼠心肌细胞原代培养的方法,培养存活率高和纯度高的心肌细胞。方法：无菌条件下取出出生1~2 d的SD大鼠心脏,用2.5 g/L胰蛋白酶和 2.0 g/L Ⅱ型胶原酶等量混合液在37℃条件下分次消化心肌组织。以差速贴壁并将时间延长至90 min纯化心肌细胞,48 h后换液。结果： 将心肌细胞24 h贴壁生长,于2~3 d心肌细胞伸出伪足,形成细胞簇,同步搏动,频率约80~130次/min,存活率为（93.9±2.8）%,纯度为（91.9±2.2）%。结论：以本实验的方法培养的心肌细胞存活率高、纯度高,是一种较为理想的原代心肌细胞培养方法。     

乳鼠原代心肌细胞培养概要

目的乳鼠原代心肌细胞培养在心血管病防治研究领域应用广泛，有关培养方法的文献更不鲜见，但心肌细胞成活率、搏动率、纯化率过低仍是本技术有待解决的关键之处，本文就心肌细胞培养过程中的注意事项做重点阐述，使依托于本技术的科学研究能够得到优质样本，进一步提高实验的成功率及实验结果的可靠性。     

大鼠冠状动脉平滑肌细胞的原代培养及鉴定

目的探讨大鼠冠状动脉平滑肌细胞的原代培养方法,为冠状动脉疾病的研究提供理想的细胞模型。方法无菌条件下分离大鼠冠状动脉,采用酶消化法分离培养平滑肌细胞,进行形态学观察及台盼蓝染色测定细胞活力,采用免疫荧光染色技术对平滑肌α肌动蛋白进行鉴定。结果形态学、免疫荧光染色鉴定表明培养的细胞为血管平滑肌细胞,细胞存活率达97%。原代培养14d左右即可进行传代,可以传6代以上,且细胞形态及生长状态良好。结论酶消化法分离大鼠冠状动脉平滑肌细胞,方法简单、高效,细胞纯度高、且活性好、生长迅速。     

铁离子螯合剂去铁敏在大鼠心肌细胞原代培养中对心肌细胞的保护作用

目的:在心肌细胞培养液中添加去铁敏,以对抗原代培养操作过程所产生的心肌细胞损伤,并探讨其保护作用. 方法:在常规新生SD乳鼠心肌细胞原代培养液中按照不同浓度添加去铁敏.抗а-肌动蛋白免疫组化法鉴定心肌细胞.心肌细胞分为对照组(不添加去铁敏);5 μmol/L去铁敏组;15 μmol/L去铁敏组;25 μmol/L去铁敏组.MTT法检测心肌细胞存活率、乳酸脱氢酶活性检测、TUNEL法检测心肌细胞凋亡率评价各组心肌细胞的损伤程度、生存率及凋亡情况. 结果:①5μmol/L去铁敏组(69.6±5.4 IU/L)、15 μmol/L去铁敏组(35.5±3.3 IU/L)和25μmol/L去铁敏组(51.0±4.3 IU/L)的乳酸脱氢酶水平均比对照组(76.3±6.1 IU/L)低,差异均有统计学意义(P<0.05～0.01).15 μmol/L去铁敏组乳酸脱氢酶水平明显低于5 μmol/L去铁敏组和25 μmol/L去铁敏组,差异均有统计学意义(P<0.05～0.01).②15 μmol/L去铁敏组(91.28±2.57)%和25 μmol/L去铁敏组(86.03±4.66)%心肌细胞生存率均比对照组(83.13 4±5.26)%高,差异均有统计学意义(P相似文献   

新生SD大鼠心房肌细胞的原代培养及改良

目的：探讨新生SD大鼠心房肌细胞的原代培养及鉴定,并对其中部分步骤进行改良。方法：采用出生1～3 d的SD乳鼠,运用“两步法”提取心房肌细胞,利用心房肌细胞与成纤维细胞贴壁时间不同和Brd U能抑制成纤维细胞繁殖进行心房肌细胞纯化,并运用双色免疫荧光进行鉴定。结果：36 h后镜下可见细胞已经贴壁,并可见少数细胞出现自发搏动,72 h后细胞铺满瓶底90%,经双色免疫荧光鉴定超过95%为心房肌细胞。结论：“两步法”可缩短胰酶消化时间,Ⅱ型胶原酶+BSA联合消化可以更有效地培养出原代心房肌细胞。     

新生大鼠心肌细胞的原代培养

目的：探讨新生大鼠心肌细胞的分离和培养方法。方法：应用0．0625％的胰蛋白酶重复消化出生第2d乳鼠的心肌组织多次,收集的细胞用含10％胎牛血清的DMEM培养基中和,用差速贴壁分离法分离．在以溴脱氧尿嘧啶（Brdu）纯化心肌细胞后置CO2培养箱孵育7d。结果：分离1只乳鼠获得的心肌细胞产量约为140万个,且有活力心肌细胞占90％以上;培养4～6h的乳鼠心肌细胞开始贴壁生长,12～24h明显增殖,3～4d后细胞融合成片;心肌细胞由圆形变为梭形、星形、多角形。并出现自发性节律性搏动。结论：本研究应用的心肌细胞原代培养方法可获得高产量、高活力的心肌细胞,是一种可靠的心肌细胞培养方法。     

大鼠近端肾小管上皮细胞的原代培养和鉴定

目的 建立较好的大鼠近端肾小管上皮细胞原代培养模型.方法 无菌取Wistar大鼠肾脏,取皮质剪碎,经Ⅰ型胶原酶消化和45%Percoll连续密度梯度离心进行纯化,用含10%胎牛血清的DMEM/F12培养基原代培养并传代,观察细胞形态并以免疫细胞化学染色及酶化学染色鉴定.结果 培养4～5 d细胞融合成单层,呈典型的鹅卵石样,细胞角蛋白18及碱性磷酸酶染色均呈阳性,细胞可传2～3代.结论 此法可在短期获得数量较多、重复性好的近端肾小管上皮细胞,为体外研究肾小管细胞的病变提供了实验平台.     

新生大鼠心肌细胞原代培养分离方法的改进

目的探索并改进乳鼠的心肌细胞原代培养方法。方法以混合消化酶(0.08%胰蛋白酶加0.04%～0.06%Ⅱ型胶原酶等量加入的混合液)消化心肌组织,差速贴壁分离纯化后,加入5-溴脱氧尿嘧啶抑制成纤维细胞分裂增殖。结果本方法培养的心肌细胞12h后即出现单个细胞搏动,2d～5d可见明显搏动的心肌细胞和心肌细胞团,成纤维细胞无明显增殖。结论本方法是一种较为理想的乳鼠心肌细胞原代培养方法。     

成年大鼠成肌细胞的原代培养

目的　探索成年大鼠成肌细胞的原代培养方法。方法　取成年SD大鼠的胸大肌 ,利用组织块培养法培养成肌细胞。绘制生长曲线 ,并对培养细胞进行形态学研究和免疫细胞化学鉴定。结果　采用组织块培养法 ,2周后成肌细胞的密度可达 10 7/ml,免疫细胞化学分析显示 90 %以上的细胞呈骨骼肌特异的肌细胞生成素 (myogenin)抗体染色阳性。结论　利用组织块法成功培养成年大鼠原代成肌细胞 ,该方法实用性强 ,所得成肌细胞纯度高 ,为深入研究心肌梗死疤痕中成肌细胞自体移植奠定了基础。     

新生SD大鼠心肌细胞培养方法的简化及改良

目的改良简化心肌细胞培养的条件和方法,培养纯度高、存活时间长的新生SD大鼠的心肌细胞。方法采用含牛血清白蛋白（bovine serum albumin,BSA）的Ⅱ型胶原酶单次消化心肌、差速贴壁1 h纯化心肌细胞进行培养,全过程在37℃条件下进行。于培养5、10、15、20、25、30 d时,用台盼蓝染色法检测细胞的存活率,并在生物倒置显微镜下观察形态学变化。取培养48 h的细胞,用免疫组织化学染色的方法检测心肌细胞的纯度。结果心肌组织在6 h时基本消化完全。培养5、10、15、20、25、30 d时,用台盼蓝染色法检测心肌细胞的存活率均大于95%,培养30 d时仍为95.2%。在生物倒置显微镜下观察,培养24 h左右的细胞之间形成交联并有细胞搏动。培养48h的细胞经免疫组织化学染色法测定,心肌细胞的纯度为（97.1±1.9）%。结论应用改良并简化的心肌细胞培养方法和培养条件,可得到纯度和存活率均高能满足大多数科研要求的原代乳鼠心肌细胞。     

新生大鼠心肌细胞的分离与培养

目的探讨新生大鼠心肌细胞分离与培养的条件和方法,建立简单、可靠的原代心肌细胞培养方法。方法新生SD乳鼠10只,开胸取心剪碎后,胰蛋白酶和Ⅱ型胶原酶联合消化心肌组织,差速贴壁法纯化心肌细胞。倒置荧光相差显微镜下连续观察15 d心肌细胞形态特征及变化。用0.4%锥虫蓝染色测心肌细胞存活率,记录心肌细胞搏动次数。结果心肌细胞24 h基本贴壁并伸出伪足,出现自发性搏动,72 h后心肌细胞逐渐形成细胞簇,并呈现部分同步搏动,之后心肌细胞连接成片生长。心肌细胞存活率为96.5%,培养72 h至第15天内心肌细胞搏动次数无差异(P>0.05)。结论用该法分离与培养新生大鼠心肌细胞,操作简单且稳定可靠,心肌细胞存活率较高。     

新生大鼠心肌细胞培养方法的改进

目的:建立便捷,成熟的新生大鼠心肌细胞体外培养方法。方法:本实验对常用的培养方法加以改进,采用胰蛋白酶及Ⅰ型、Ⅱ型胶原酶共同消化法,分离新生大鼠心肌细胞,并对体外培养的心肌细胞的存活率、活力及纯度进行鉴定。结果:分离的心肌细胞存活率为96%,培养3 d后有60%~80%的细胞开始搏动,搏动频率平均50次/min,心肌细胞纯度在75%以上。结论:本实验建立的新生大鼠心肌细胞体外培养方法是成熟,可靠的。     

Wistar大鼠乳鼠与成年鼠心室肌细胞的分离与性质鉴定

目的 探索和优化稳定的适于电生理实验研究的乳鼠及成年大鼠心室肌细胞分离方法。方法 切碎乳鼠心室肌,胰蛋白酶消化,差速贴壁2 h纯化心室肌细胞,台盼蓝染色判定心肌细胞活力,体外培养48 h后分别行倒置显微镜观察细胞形态,免疫组化鉴定,微电极阵列记录细胞搏动频率和场电位。采用Langendorff灌流成年大鼠心脏,主动脉逆行插管,胶原酶域反复灌流消化约30 min,无钙台氏液冲洗心脏5 min,剪下心室肌组织,台氏液中室温下剪碎,吹打,孵育5 min后,用200目筛网过滤,将细胞悬液用逐步复钙法复钙后,室温静置1 h,用于膜片钳记录。结果 经4 -6次消化后,乳鼠心室组织消化完全,细胞存活率大于80%。倒置显微镜下观察,细胞呈梭形、多角形。 12 h有少部分细胞搏动,48 h细胞交织成网,搏动呈同步性,搏动频率30 - 80次/分。 琢鄄辅肌动蛋白（琢鄄actin）经免疫组化检测,纯度达96%。 Langendorff灌流酶解法可获得形态呈杆状、横纹清晰、膜周边光滑完整、立体感强的单个成年鼠心肌细胞,存活率85%,复钙后存活率50%,可用于膜片钳记录。结论 采用本方法可以获得高产量与高质量的用于电生理检测的心室肌细胞。     

Effects of acidosis on ventricular muscle from adult and neonatal rats

We compared the response of ventricular muscle from adult and neonatal rats to hypercapnic acidosis. In adult muscle, acidosis caused an initial rapid fall of developed tension to 30 +/- 5% of control (mean +/- SEM, n = 6). However, tension recovered slowly to a steady state that was 56 +/- 6% of control. In neonatal muscle, acidosis caused a significantly smaller initial fall in tension to 43 +/- 3% (n = 8, p less than 0.05), but the tension then showed a subsequent slower fall to a steady state that was 29 +/- 4% of control, significantly less than in the adult (p less than 0.01). We have attempted to identify the mechanisms underlying these differences in response. In detergent-skinned myofibrils, reducing the pH from 7.0 to 6.5 caused a reduction in the pCa50 of 0.61 units in the adult muscle, but only 0.27 units in the neonatal ventricular muscle. Myofibrillar Ca2+ sensitivity in neonatal ventricular muscle is thus less susceptible to the effects of acidic pH than that of adult muscle. Since intracellular pH decreases rapidly on application of increased external CO2, these results are consistent with the finding that, initially, developed tension in neonatal muscles is less sensitive to the effects of acidosis. Sodium dodecylsulfate gel electrophoresis of myofibrillar preparations from adult and neonatal rats demonstrated differences in thin filament proteins, including troponin I, which may underlie the observed differences in Ca2+ sensitivity. In adult rat ventricular muscles, the slow recovery of tension during acidosis is associated with an increase in the amplitude of the Ca2+ transients to 263 +/- 34% of control (n = 4).(ABSTRACT TRUNCATED AT 250 WORDS)     

Substrate oxidation by adult cardiomyocytes in long-term primary culture

In medium 199 plus 20% fetal calf serum adult rat cardiomyocytes establish a long-term culture (25 days). During the first 10 days they change their gross morphology from the typical elongated in vivo shape (day 1), to a smooth spherical intermediate form (days 2 to 5), to a spread cell type beating spontaneously (days 10 to 15). During the first 10 days in culture, protein content per cell increases and the cell population decreases. By the tenth day, protein content has doubled, and about half of the cells originally plated remain. Thereafter both the protein content and the number of cells are essentially constant for the remainder of the 25-day period investigated. On days 1, 15 and 25 adenine nucleotide contents (213, 216 and 225 nmol/10(6) cells) and values of adenylate energy charge (0.91, 0.87 and 0.88) were similar. At all times in culture, palmitate (0.1 mM) is oxidized at higher rates than lactate (1 mM) and glucose (5 mM). At all times in culture glycolytic flux is sensitive to insulin with half maximal effect seen around 10(-9) M. Oxidation rates for all exogenous substrates are maximal at 15 days in culture, indicating maximal energy demand at this time. The conversion of glucose to lactate, however, progressively increases, so that at 25 days in culture, 70% of ATP derived from degradation of exogenous glucose is glycolytic. The results of this study demonstrate that oxidative metabolism of cardiomyocytes in long-term culture resembles, in its basic characteristics, that of the intact heart. In their increased glycolytic activity, however, they are clearly different.     

Isolation and primary culture of rat Kupffer cells

The aim of this study was to describe a reproducible method for the isolation, purification and primary culture of rat Kupffer cells. Kupffer cells were isolated following sequential pronase/collagenase digestion of the liver and enrichment of a non-parenchymal cell fraction by a single-density gradient centrifugation step using 30% metrizamide. Kupffer cells were isolated and further purified from this cell fraction by centrifugal elutriation. Kupffer cells were isolated at 1017 g at 48–110 mL/min. All Kupffer cell fractions exhibited phagocytosis of 3 μm latex beads. Kupffer cell fractions isolated at 48 and 60 mL/min were predominantly ED2 negative while later fractions (80–110 mL/min) were ED2 positive. Kupffer cells were adherent in culture after 2 h. This method for Kupffer cell isolation resulted in a yield of 80–120 times 10⁶ Kupffer cells per liver.     

Comparison between isomyosin pattern and contractility of right ventricular myocytes isolated from rats with right cardiac hypertrophy

Summary The contractile properties of single rat cardiac cells isolated from normal and hypertrophied right ventricles have been investigated. These have been correlated with the isoenzyme composition of the whole ventricle. Right cardiac hypertrophy was induced by injecting rats with monocrotaline, an alkaloid which induces severe pulmonary hypertension. Ca²⁺ ATPase activity and myosin alpha-chain percentage were decreased in the hypertrophied right ventricle as compared with that of control rats. The contraction amplitude and speed of shortening of the isolated cells were measured using an inverted microscope, video camera, and edge detection device. Cells from the hypertrophied ventricle showed a significantly decreased contraction amplitude and speed of shortening in maximally activating concentrations of isoprenaline. A statistically significant correlation existed between myosin alpha-chain percentage and both contraction amplitude and speed of shortening in maximum isoprenaline. This was truc when all cells studied were included, as well as within the hypertrophy group. A similar, although not always statistically significant, correlation was observed when cells were maximally activated with calcium. These results suggest that changes in isomyosin pattern that occur in cardiac hypertrophy produce alterations in contraction amplitude and speed of shortening which can be detected in single cells isolated from the hypertrophied ventricles. Isolated cells appear to give responses representative of the function of the whole heart.