BioVector? Mv1Lu 水貂肺上皮細(xì)胞株 BioVector? Mv1Lu Mink Lung Epithelial Cell Line

第一部分：中文說明

一、 產(chǎn)品基本信息與詳細(xì)特征描述

• 產(chǎn)品名稱：BioVector? Mv1Lu 水貂肺上皮細(xì)胞株

• 細(xì)胞株名稱：Mv1Lu (亦稱 Mv 1 Lu, CCL-64)

• 物種來源：水貂 (Mink, Neovison vison / Mustela vison)

• 組織來源：正常水貂胚胎的肺部組織 (Lung tissue)

• 細(xì)胞屬性：上皮樣細(xì)胞 (Epithelial-like) / 貼壁生長 (Adherent)

• 生物安全級別：1級 (BSL-1)

• 詳細(xì)特征描述：BioVector? Mv1Lu 是一種在細(xì)胞生物學(xué)、病毒學(xué)及毒理學(xué)研究中極具價值的經(jīng)典哺乳動物貼壁型上皮細(xì)胞株。該細(xì)胞株最早于 1964 年由 Kniazeff 等人通過分離正常水貂胚胎的肺組織建立。在顯微鏡下，Mv1Lu 細(xì)胞呈現(xiàn)出典型、高度均一的片狀類似上皮細(xì)胞形態(tài)，接觸抑制明顯，匯合后形成致密的單層細(xì)胞。Mv1Lu 在生物醫(yī)學(xué)界因其對轉(zhuǎn)化生長因子-β (TGF-β) 具有極其靈敏的生長抑制反應(yīng)而聞名，是國際上定量檢測 TGF-β 生物學(xué)活性的“金標(biāo)準(zhǔn)”細(xì)胞系。此外，該細(xì)胞缺乏功能性的免疫抑制檢查點(diǎn)干擾，且對多種哺乳動物病毒（如流感病毒、水皰性口炎病毒 VSV、呼腸孤病毒等）具有高度易感性，因此被廣泛用于病毒分離、滴定、宿主范圍跨越研究以及抗病毒藥物的高通量篩選。

二、 細(xì)胞培養(yǎng)環(huán)境、培養(yǎng)基配方與理化參數(shù)

• 標(biāo)準(zhǔn)培養(yǎng)基配方：

  • 基礎(chǔ)培養(yǎng)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% 優(yōu)質(zhì)胎牛血清 (FBS, Fetal Bovine Serum)。

  • 雙抗（可選）：1% 青霉素-鏈霉素溶液（終濃度 100 U/mL 青霉素，100 μg/mL 鏈霉素）。

• 理化與物理培養(yǎng)參數(shù)：

  • 培養(yǎng)溫度：37°C 恒溫培養(yǎng)。

  • 氣體環(huán)境：5% 二氧化碳 (CO2)，空氣飽和濕度環(huán)境。

  • 貼壁特性：細(xì)胞貼壁依賴性強(qiáng)，匯合度達(dá)到 80%–90% 時需要及時進(jìn)行傳代，避免細(xì)胞過密導(dǎo)致接觸抑制后的細(xì)胞退化或自發(fā)脫落。

三、 細(xì)胞傳代、復(fù)蘇與 TGF-β 活性生物測定標(biāo)準(zhǔn)操作步驟

1. 常規(guī)貼壁傳代操作 (周期 2–3 天)：

   • 當(dāng)細(xì)胞匯合度達(dá)到 85% 左右時，吸除舊培養(yǎng)基，使用無菌的 BioVector? PBS（不含鈣鎂離子）輕輕洗滌細(xì)胞單層 1–2 次。

   • 加入適量預(yù)熱的 0.25% 胰蛋白酶-0.02% EDTA 消化液，置于 37°C 培養(yǎng)箱中消化 1–3 分鐘。顯微鏡下觀察到細(xì)胞變圓、開始相互分離時，立即加入等體積的含血清完全培養(yǎng)基終止消化。

   • 輕輕吹打平皿表面使細(xì)胞完全脫落并分散成單細(xì)胞懸液。以每分鐘 1000 轉(zhuǎn) (RPM) 離心 5 分鐘，棄上清，用新鮮完全培養(yǎng)基重懸，按照 1:3 至 1:6 的比例轉(zhuǎn)接至新的培養(yǎng)瓶中。

2. 凍存細(xì)胞快速復(fù)蘇：

   • 從液氮或零下 80°C 超低溫冰箱中取出 Mv1Lu 凍存管，迅速投入 37°C 水中連續(xù)劇烈搖動，使其在 1–2 分鐘內(nèi)完全融化。

   • 立即用酒精消毒管口，將細(xì)胞懸液轉(zhuǎn)移至含 5 毫升預(yù)熱培養(yǎng)基的離心管中，1000 RPM 離心 3 分鐘以去除殘留的凍存劑 DMSO。

   • 棄上清，用完全培養(yǎng)基重懸后接種至 T25 培養(yǎng)瓶中，置于 37°C、5% CO2 培養(yǎng)箱中過夜，次日更換新鮮培養(yǎng)基。

3. TGF-β 活性生物測定 (Bioassay)：

   • 將處于對數(shù)生長期的 Mv1Lu 細(xì)胞消化并計數(shù)，以每孔約 $2 \times 10^3$ 個細(xì)胞的低密度接種于 96 孔板中，培養(yǎng)過夜使其貼壁。

   • 換用含有極低血清（如 0.5% FBS）或無血清的培養(yǎng)基，加入不同稀釋梯度的待測 TGF-β 標(biāo)準(zhǔn)品或樣品。

   • 持續(xù)孵育 24 至 48 小時后，通過 BioVector? MTT 法、CCK-8 法或 $[^3H]\text{-TdR}$（胸腺嘧啶核苷）摻入法測定細(xì)胞增殖抑制率，根據(jù)細(xì)胞生長抑制曲線精準(zhǔn)計算出樣品中 TGF-β 的生物學(xué)活性單位。

四、 細(xì)胞株長期保藏與凍存技術(shù)

• 標(biāo)準(zhǔn)凍存液配方：現(xiàn)配現(xiàn)用。55% 基礎(chǔ)培養(yǎng)基 + 35% 優(yōu)質(zhì)胎牛血清 (FBS) + 10% 二甲基亞砜 (DMSO)；或直接使用 90% FBS + 10% DMSO。

• 冷凍降溫保藏程序：將收集的 Mv1Lu 細(xì)胞沉淀用配置好的冷凍保護(hù)液重懸，調(diào)整細(xì)胞密度至每毫升 $1 \times 10^6$ 到 $5 \times 10^6$ 個細(xì)胞。分裝入無菌凍存管中，放入標(biāo)準(zhǔn)程序降溫盒（如 Mr. Frosty，確保每分鐘降溫 1°C）置于零下 80°C 冰箱過夜。次日必須迅速轉(zhuǎn)移至液氮罐（零下 196°C）中進(jìn)行永久性保藏，以維持細(xì)胞長期復(fù)蘇后的高存活率。

五、 質(zhì)量控制標(biāo)準(zhǔn)與科研應(yīng)用指南

• 質(zhì)量控制標(biāo)準(zhǔn)：BioVector? 提供的 Mv1Lu 細(xì)胞株通過了極為嚴(yán)格的全面質(zhì)量篩查。經(jīng) PCR 檢測確認(rèn) 100% 無支原體 (Mycoplasma) 污染，無細(xì)菌、真菌及常見哺乳動物外源病毒（如 BVDV 等）污染；經(jīng)同工酶或 STR 鑒定確認(rèn)無大鼠、小鼠、人類等其他物種細(xì)胞的交叉污染；細(xì)胞對 TGF-β 的應(yīng)答敏感性及貼壁生長動力學(xué)特征保持多世代高度穩(wěn)定。

• 核心實驗應(yīng)用方向：

  • 細(xì)胞因子分析：用于天然或重組轉(zhuǎn)化生長因子-β (TGF-β1, TGF-β2, TGF-β3) 抑制活性的定量檢測與中和抗體效價評估。

  • 病毒學(xué)與公共衛(wèi)生研究：用于流感病毒亞型、水皰性口炎病毒（VSV）等多種有封包/無封包原核與真核病毒的體外分離培養(yǎng)、蝕斑測定（Plaque Assay）及宿主細(xì)胞互作研究。

  • 信號傳導(dǎo)機(jī)制研究：深入探索 Smad 通路、TGF-β 受體復(fù)合物裝配以及上皮-間充質(zhì)轉(zhuǎn)化（EMT）早期分子事件的體外細(xì)胞模型。

  • 體外毒理學(xué)評價：用于環(huán)境污染物、吸入性毒物或呼吸道藥物對哺乳動物肺部上皮細(xì)胞的細(xì)胞毒性（Cytotoxicity）以及氧化應(yīng)激反應(yīng)的定量篩查。

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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