BioVector® Mv1Lu 水貂肺上皮细胞株 BioVector® Mv1Lu Mink Lung Epithelial Cell Line

第一部分：中文说明

一、 产品基本信息与详细特征描述

• 产品名称：BioVector® Mv1Lu 水貂肺上皮细胞株

• 细胞株名称：Mv1Lu (亦称 Mv 1 Lu, CCL-64)

• 物种来源：水貂 (Mink, Neovison vison / Mustela vison)

• 组织来源：正常水貂胚胎的肺部组织 (Lung tissue)

• 细胞属性：上皮样细胞 (Epithelial-like) / 贴壁生长 (Adherent)

• 生物安全级别：1级 (BSL-1)

• 详细特征描述：BioVector® Mv1Lu 是一种在细胞生物学、病毒学及毒理学研究中极具价值的经典哺乳动物贴壁型上皮细胞株。该细胞株最早于 1964 年由 Kniazeff 等人通过分离正常水貂胚胎的肺组织建立。在显微镜下，Mv1Lu 细胞呈现出典型、高度均一的片状类似上皮细胞形态，接触抑制明显，汇合后形成致密的单层细胞。Mv1Lu 在生物医学界因其对转化生长因子-β (TGF-β) 具有极其灵敏的生长抑制反应而闻名，是国际上定量检测 TGF-β 生物学活性的“金标准”细胞系。此外，该细胞缺乏功能性的免疫抑制检查点干扰，且对多种哺乳动物病毒（如流感病毒、水疱性口炎病毒 VSV、呼肠孤病毒等）具有高度易感性，因此被广泛用于病毒分离、滴定、宿主范围跨越研究以及抗病毒药物的高通量筛选。

二、 细胞培养环境、培养基配方与理化参数

• 标准培养基配方：

  • 基础培养基：BioVector® 改良型高糖 DMEM (Dulbecco's Modified Eagle Medium) 或 MEM (Minimum Essential Medium，需添加非必需氨基酸 NEAA)。

  • 血清添加量：10% 优质胎牛血清 (FBS, Fetal Bovine Serum)。

  • 双抗（可选）：1% 青霉素-链霉素溶液（终浓度 100 U/mL 青霉素，100 μg/mL 链霉素）。

• 理化与物理培养参数：

  • 培养温度：37°C 恒温培养。

  • 气体环境：5% 二氧化碳 (CO2)，空气饱和湿度环境。

  • 贴壁特性：细胞贴壁依赖性强，汇合度达到 80%–90% 时需要及时进行传代，避免细胞过密导致接触抑制后的细胞退化或自发脱落。

三、 细胞传代、复苏与 TGF-β 活性生物测定标准操作步骤

1. 常规贴壁传代操作 (周期 2–3 天)：

   • 当细胞汇合度达到 85% 左右时，吸除旧培养基，使用无菌的 BioVector® PBS（不含钙镁离子）轻轻洗涤细胞单层 1–2 次。

   • 加入适量预热的 0.25% 胰蛋白酶-0.02% EDTA 消化液，置于 37°C 培养箱中消化 1–3 分钟。显微镜下观察到细胞变圆、开始相互分离时，立即加入等体积的含血清完全培养基终止消化。

   • 轻轻吹打平皿表面使细胞完全脱落并分散成单细胞悬液。以每分钟 1000 转 (RPM) 离心 5 分钟，弃上清，用新鲜完全培养基重悬，按照 1:3 至 1:6 的比例转接至新的培养瓶中。

2. 冻存细胞快速复苏：

   • 从液氮或零下 80°C 超低温冰箱中取出 Mv1Lu 冻存管，迅速投入 37°C 水中连续剧烈摇动，使其在 1–2 分钟内完全融化。

   • 立即用酒精消毒管口，将细胞悬液转移至含 5 毫升预热培养基的离心管中，1000 RPM 离心 3 分钟以去除残留的冻存剂 DMSO。

   • 弃上清，用完全培养基重悬后接种至 T25 培养瓶中，置于 37°C、5% CO2 培养箱中过夜，次日更换新鲜培养基。

3. TGF-β 活性生物测定 (Bioassay)：

   • 将处于对数生长期的 Mv1Lu 细胞消化并计数，以每孔约 $2 \times 10^3$ 个细胞的低密度接种于 96 孔板中，培养过夜使其贴壁。

   • 换用含有极低血清（如 0.5% FBS）或无血清的培养基，加入不同稀释梯度的待测 TGF-β 标准品或样品。

   • 持续孵育 24 至 48 小时后，通过 BioVector® MTT 法、CCK-8 法或 $[^3H]\text{-TdR}$（胸腺嘧啶核苷）掺入法测定细胞增殖抑制率，根据细胞生长抑制曲线精准计算出样品中 TGF-β 的生物学活性单位。

四、 细胞株长期保藏与冻存技术

• 标准冻存液配方：现配现用。55% 基础培养基 + 35% 优质胎牛血清 (FBS) + 10% 二甲基亚砜 (DMSO)；或直接使用 90% FBS + 10% DMSO。

• 冷冻降温保藏程序：将收集的 Mv1Lu 细胞沉淀用配置好的冷冻保护液重悬，调整细胞密度至每毫升 $1 \times 10^6$ 到 $5 \times 10^6$ 个细胞。分装入无菌冻存管中，放入标准程序降温盒（如 Mr. Frosty，确保每分钟降温 1°C）置于零下 80°C 冰箱过夜。次日必须迅速转移至液氮罐（零下 196°C）中进行永久性保藏，以维持细胞长期复苏后的高存活率。

五、 质量控制标准与科研应用指南

• 质量控制标准：BioVector® 提供的 Mv1Lu 细胞株通过了极为严格的全面质量筛查。经 PCR 检测确认 100% 无支原体 (Mycoplasma) 污染，无细菌、真菌及常见哺乳动物外源病毒（如 BVDV 等）污染；经同工酶或 STR 鉴定确认无大鼠、小鼠、人类等其他物种细胞的交叉污染；细胞对 TGF-β 的应答敏感性及贴壁生长动力学特征保持多世代高度稳定。

• 核心实验应用方向：

  • 细胞因子分析：用于天然或重组转化生长因子-β (TGF-β1, TGF-β2, TGF-β3) 抑制活性的定量检测与中和抗体效价评估。

  • 病毒学与公共卫生研究：用于流感病毒亚型、水疱性口炎病毒（VSV）等多种有封包/无封包原核与真核病毒的体外分离培养、蚀斑测定（Plaque Assay）及宿主细胞互作研究。

  • 信号传导机制研究：深入探索 Smad 通路、TGF-β 受体复合物装配以及上皮-间充质转化（EMT）早期分子事件的体外细胞模型。

  • 体外毒理学评价：用于环境污染物、吸入性毒物或呼吸道药物对哺乳动物肺部上皮细胞的细胞毒性（Cytotoxicity）以及氧化应激反应的定量筛查。

PART 2: ENGLISH SECTION

I. General Information and Detailed Product Characterization

• Product Name: BioVector® Oryza sativa cv. Oc Spontaneously Immortalized Rice Cell Line

• Cell Line Name: Mv1Lu (also designated as Mv 1 Lu, CCL-64)

• Species Origin: Mink (Neovison vison / Mustela vison)

• Tissue Source: Lung tissue harvested from a normal mink fetus.

• Cell Category: Epithelial-like / Adherent growth profile

• Biosafety Level: BSL-1

• Detailed Description: BioVector® Mv1Lu is a classic and highly versatile mammalian adherent epithelial cell line of exceptional value across cell biology, virology, and toxicology research networks. Established originally in 1964 by Kniazeff and associates from normal embryonic mink lung tissue, Mv1Lu cells exhibit a highly homogeneous, sheet-like epithelial morphology under microscopic observation, manifesting prominent contact inhibition and forming a tightly packed monolayer upon confluence. In the biomedical arena, Mv1Lu is internationally renowned for its exquisite, ultra-sensitive growth inhibition response when exposed to Transforming Growth Factor-beta (TGF-β), rendering it the universal gold-standard bioassay cell platform for quantifying TGF-β biological potency. Additionally, due to its reliable susceptibility to a broad host spectrum of mammalian viruses—including influenza viruses, vesicular stomatitis virus (VSV), and reoviruses—Mv1Lu represents a fundamental baseline for viral isolation, plaque-forming titration, cross-species host-range dynamic mapping, and high-throughput anti-viral compound screenings.

II. Cultivation Environments, Medium Formulations, and Physical Parameters

• Standardized Growth Medium Formulation:

  • Basal Medium: BioVector® Optimized High-Glucose DMEM (Dulbecco's Modified Eagle Medium) or MEM (Minimum Essential Medium supplemented with 1% Non-Essential Amino Acids, NEAA).

  • Serum Supplementation: 10% premium-grade Fetal Bovine Serum (FBS).

  • Antibiotics (Optional): 1% Penicillin-Streptomycin Solution (final concentration of 100 U/mL Penicillin and 100 μg/mL Streptomycin).

• Physical Processing Criteria:

  • Incubation Temperature: Constantly maintained at 37°C.

  • Gaseous Atmosphere: 5% Carbon Dioxide ($CO_2$) balanced with ambient air under saturated humidified conditions.

  • Adherence Dynamics: Highly anchorage-dependent. Subculturing protocols must be strictly initiated when cell density spans 80%–90% confluence to prevent cell deterioration, overcrowding artifacts, or spontaneous shedding resulting from extreme post-confluence contact inhibition.

III. Subculturing, Cryovial Thawing, and TGF-β Bioassay Protocols

1. Routine Adherent Passaging Schedule (2–3 Day Routine Loop):

   • Once the monolayer reaches approximately 85% confluence, aspirate the spent medium and gently rinse the cell layer 1–2 times with sterile, calcium- and magnesium-free BioVector® PBS.

   • Dispense an adequate volume of pre-warmed 0.25% Trypsin - 0.02% EDTA Disassociation Solution and incubate at 37°C for 1–3 minutes. Once microscopic check reveals cells rounding up and separating from the flask substratum, instantly add an equal volume of serum-containing complete medium to deactivate the enzyme.

   • Gently pipet the surface to achieve a uniform single-cell suspension. Centrifuge at 1000 RPM for 5 minutes, discard the supernatant, resuspend the cell pellet in fresh complete medium, and split into new culture vessels at a standard subcultivation ratio spanning 1:3 to 1:6.

2. Cryopreserved Aliquot Thawing:

   • Retrieve an Mv1Lu cryovial from the liquid nitrogen storage or minus 80°C freezer and instantly plunge it into a 37°C water bath, agitating vigorously for 1–2 minutes until the icy mass liquefies completely.

   • Wipe the tube exterior with 75% ethanol, transfer the contents into a sterile tube containing 5 mL of pre-warmed complete medium, and spin at 1000 RPM for 3 minutes to eliminate toxic DMSO protectants.

   • Decant the supernatant, resuspend the cell mass in complete medium, transfer into a T25 flask, and place inside a 37°C, 5% $CO_2$ incubator overnight. Replace with fresh complete medium the following day.

3. TGF-β Biological Activity Potency Assay:

   • Harvest and count log-phase Mv1Lu cells, seeding them into a 96-well microplate at a low density of approximately $2 \times 10^3$ cells per well. Allow them to attach overnight.

   • Evacuate the growth medium and replace it with low-serum (e.g., 0.5% FBS) or serum-free test medium. Supplement the wells with serial dilutions of calibrated TGF-β reference standards or experimental unknowns.

   • Maintain incubation for 24 to 48 hours. Quantify cellular proliferation inhibition rates via BioVector® MTT, CCK-8, or $[^3H]\text{-TdR}$ (tritiated thymidine) incorporation kinetics to construct growth inhibition curves and determine relative biological activity units.

IV. Cell Line Cryopreservation and Long-Term Archiving

• Cryoprotective Matrix Formulation: Formulate freshly before use. 55% basal medium + 35% premium Fetal Bovine Serum (FBS) + 10% Dimethyl Sulfoxide (DMSO); alternatively, a high-serum mixture of 90% FBS + 10% DMSO can be deployed.

• Rate-Controlled Freezing Schedule: Suspend cleanly harvested Mv1Lu cell pellets in chilled cryoprotective matrix, adjusting the definitive concentration to span $1 \times 10^6$ to $5 \times 10^6$ viable cells per milliliter. Dispense into sterile cryogenic vials. Enclose vials within a standardized container (such as a "Mr. Frosty" box) designed to reduce temperature at a predictable 1°C per minute inside a minus 80°C freezer overnight. Transfer the vials into liquid nitrogen storage (-196°C) the next day for indefinite preservation.

V. Quality Control Standards and Strategic Research Applications

• Quality Control Standards: Every batch of BioVector® Mv1Lu cell lines undergoes extensive quality control screens. PCR validation certifies 100% negative status for Mycoplasma contamination, alongside absolute freedom from bacterial, fungal, or common mammalian adventitious viral agents (such as BVDV). Isoenzyme profile and STR validation confirm zero cross-contamination from human, murine, or alternative rodent cell lines. Target sensitivity towards TGF-β challenges and adherent growth kinetics remain stable across extended passage windows.

• Core Experimental Applications:

  • Cytokine Potency Profiling: Quantitative bioassay tracking of natural or recombinant Transforming Growth Factor-beta variants (TGF-β1, TGF-β2, TGF-β3) and neutralizing antibody efficacy indexing.

  • Virology & Public Health Research: Serving as an exceptional host matrix for the in vitro propagation, plaque purification, and infectivity analysis of influenza strains, vesicular stomatitis virus (VSV), and assorted enveloped or non-enveloped mammalian viral entities.

  • Signal Transduction Mapping: Modeling the molecular choreography of the Smad cascade, TGF-β receptor complex assembly, and early-stage Epithelial-Mesenchymal Transition (EMT) mechanics.

  • In Vitro Toxicology Screenings: Evaluating localized cytotoxicity thresholds, cell viability index alterations, and oxidative stress pathways in mammalian pulmonary epithelial targets following exposure to environmental toxicants, inhalable microparticles, or respiratory drugs.

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