pLenti CMV TRE3G Neo GFP-Progerin BioVector? 慢病毒表達質(zhì)粒 BioVector? pLenti CMV TRE3G Neo GFP-Progerin Lentiviral Vector
- 價 格:¥39950
- 貨 號:BioVector? pLenti CMV TRE3G Neo GFP-Progerin
- 產(chǎn) 地:北京
- BioVector NTCC典型培養(yǎng)物保藏中心
- 聯(lián)系人:Dr.Xu, Biovector NTCC Inc.
電話:400-800-2947 工作微信:1843439339 (QQ同號)
手機:18901268599
地址:北京
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BioVector? pLenti CMV TRE3G Neo GFP-Progerin 慢病毒表達質(zhì)粒
BioVector? pLenti CMV TRE3G Neo GFP-Progerin Lentiviral Vector
1 產(chǎn)品基本信息與轉(zhuǎn)錄框架 / Product Identification and Vector Architecture
產(chǎn)品名稱 (Product Name):BioVector? pLenti CMV TRE3G Neo GFP-Progerin 慢病毒四環(huán)素誘導表達質(zhì)粒 (BioVector? pLenti CMV TRE3G Neo GFP-Progerin inducible Lentiviral Expression Plasmid)
產(chǎn)品類型 (Vector Type):第三代慢病毒轉(zhuǎn)導表達載體、四環(huán)素/多西環(huán)素誘導控制載體 (3rd Generation Inducible Lentiviral Expression Vector)
克隆復制子與選擇標記 (Replication Loci and Selection Markers):
大腸桿菌復制子 (Bacterial Ori):pUC ori(高拷貝復制子 / High-copy replication origin)
大腸桿菌抗性 (Bacterial Resistance):Ampicillin(Amp 氨芐青霉素抗性,100 ug/mL)
哺乳動物細胞篩選標記 (Mammalian Selection Marker):Neomycin / G418(新霉素/G418抗性,由獨立啟動子驅(qū)動 / Driven by an independent promoter)
核心轉(zhuǎn)錄盒配置 (Core Transcriptional Cassette Topology):
誘導型啟動子 (Inducible Promoter):TRE3G 啟動子(第三代四環(huán)素響應(yīng)元件 Tet-Responsive Element,由 7 個重復的 tet 操縱子序列融合一個修飾過的微型 CMV 啟動子組成)。該啟動子本身處于完全靜息狀態(tài),幾乎沒有任何基底漏表達(Basal leakage),只有當細胞內(nèi)同時表達的 Tet-On 3G 反式激活蛋白與多西環(huán)素(Doxycycline / Dox)結(jié)合后,才能強力特異性激活下游基因轉(zhuǎn)錄。(TRE3G promoter, featuring 7 tandem tet operator repeats bound to a modified minimal CMV window. It exhibits minimal basal leakage and yields robust transcriptional induction only when the Tet-On 3G transactivator binds Doxycycline.)
融合目的基因 (Target Fusion Gene):GFP-Progerin。綠色熒光蛋白(GFP)的開放閱讀框與人類 Progerin(早衰蛋白) 基因的 N 端無縫融合,轉(zhuǎn)錄后表達帶有綠色熒光定位的早衰蛋白。(The open reading frame of Green Fluorescent Protein is fused directly to the N-terminus of human Progerin, generating a fluorescently trackable mutant lamin A variant.)
2 分子細胞生物學特征與疾病模型價值 / Molecular Dynamics and Disease Modeling
BioVector? pLenti CMV TRE3G Neo GFP-Progerin 載體是研究人類衰老分子機理的尖端分子生物學工具,其在體外細胞模型中的核心表現(xiàn)如下:The BioVector? pLenti CMV TRE3G Neo GFP-Progerin delivery design serves as a cutting-edge platform for decoding the hallmarks of human senescent cascades:
早衰蛋白的分子機制 (Mechanism of Progerin Expression)
Progerin 是核纖層蛋白 A(Lamin A / 由 LMNA 基因編碼)的一種病理性剪切突變體。由于該突變丟失了 C 端的一個關(guān)鍵剪切位點,導致其分子末端發(fā)生永久性的法尼?;‵arnesylation),無法從核膜上脫落,從而在核內(nèi)膜上形成異常沉積。Progerin is a truncated, pathologically spliced mutant variant of Lamin A. Due to the deletion of an internal cleavage site, it undergoes permanent farnesylation at its C-terminus, trapping the structural meshwork underneath the inner nuclear membrane.
誘導表達的細胞生物學表型 (Cellular Phenotypes Upon Dox Induction)
當通過慢病毒將該載體穩(wěn)定整合到人原代成纖維細胞、間充質(zhì)干細胞(MSCs)或誘導多能干細胞(iPSCs)中,并添加 BioVector? Doxycycline 誘導后,細胞會集中重現(xiàn)以下早衰病理特征:Following stable lentiviral integration and subsequent exposure to BioVector? Doxycycline, target cells dynamically mimic Hutchinson-Gilford Progeria Syndrome (HGPS) pathology:
核畸形與異染色質(zhì)丟失 (Nuclear Dysmorphology):在熒光顯微鏡下可直接觀察到 GFP-Progerin 強烈定位在核膜邊緣。隨著蛋白富集,原本圓潤的細胞核會發(fā)生嚴重的核膜起皺、起泡(Blebbing)和分葉畸形,伴隨異染色質(zhì)標志物(如 H3K9me3)的劇烈丟失。(Direct fluorescent microscopy captures GFP-Progerin reinforcing the nuclear periphery, triggering nuclear blebbing, invaginations, and the profound loss of heterochromatin signatures.)
DNA 損傷與細胞加速衰老 (DNA Damage and Accelerated Senescence):Progerin 在核膜的沉積會嚴重干擾 DNA 復制與轉(zhuǎn)錄,引發(fā)內(nèi)源性復制壓力,導致細胞內(nèi)出現(xiàn)大量的 gamma-H2AX 損傷灶。最終迫使細胞周期永久停滯,停止增殖,并高表達衰老相關(guān) beta-半乳糖苷酶(SA-beta-gal),分泌大量的衰老相關(guān)表型因子(SASP)。(Accumulation blocks replication forks, inducing gamma-H2AX damage foci, permanently arresting the cell cycle, and driving strong SA-beta-gal scaling alongside SASP secretion.)
3 宿主大腸桿菌擴增與質(zhì)粒維持規(guī)范 / Bacterial Amplification Protocols
警告 / Critical Warning該載體含有慢病毒的長末端重復序列(LTR),且內(nèi)部帶有高度重復的 7 乘以 tetO 操縱子元件,屬于極度不穩(wěn)定的“易突變/易重組”質(zhì)粒。嚴禁使用普通的常規(guī)克隆菌株(如 DH5a 或 JM109)進行擴增,否則極易發(fā)生 LTR 缺失或 TRE 啟動子重組片段丟失,導致質(zhì)粒徹底失效。Due to conflicting lentiviral long terminal repeats (LTRs) flanking the repeating 7xtetO motifs, this plasmid is classified as highly unstable. Never amplify this backbone using conventional cloning bacteria like DH5a. Doing so risks extensive LTR rearrangement or TRE truncation, rendering the batch non-functional.
選用的宿主菌株與培養(yǎng)基配方 / Authorized Bacterial Host and Broth Rules
推薦宿主菌株 (Mandatory Host):BioVector? Stbl3 或 BioVector? Stbl4 基因工程大腸桿菌(此類菌株缺失了 recA1 和 endA1 關(guān)鍵重組酶,能極大穩(wěn)定重復序列質(zhì)粒 / Competent lines engineered to suppress deletion tracks in unstable repeats)。
專用擴增培養(yǎng)基 (Growth Medium):BioVector? LB Liquid Medium 液體培養(yǎng)基(每升含 10 g 胰蛋白胨、5 g 酵母提取物、10 g 氯化鈉 / 10g Tryptone, 5g Yeast Extract, 10g NaCl per liter)。
抗生素濃度 (Antibiotic Selection):添加 100 ug/mL BioVector? Ampicillin(氨芐青霉素)。
物理栽培控溫 (Thermal Parameters - Critical):為了進一步降低自發(fā)重組率,全程必須在 30 攝氏度下進行恒溫震蕩培養(yǎng)(180 到 200 rpm),禁止在傳統(tǒng)的 37 攝氏度下快速生長。過夜培養(yǎng)時間可適度延長至 16 到 20 小時。(To minimize deletion mutations, the culture must be shaken strictly at 30 degrees Celsius (180 to 200 rpm). Do not grow at standard 37 degrees Celsius.)
4 慢病毒包裝、純化與靶細胞穩(wěn)定株篩選 / Lentiviral Packaging and Transduction
A 階段:三/四質(zhì)粒系統(tǒng)慢病毒包裝 / Phase A: Lentiviral Production
將高純度、無內(nèi)毒素的 BioVector? pLenti CMV TRE3G Neo GFP-Progerin 質(zhì)粒與標準的慢病毒三質(zhì)?;蛩馁|(zhì)粒包裝輔助系統(tǒng)(如含 pMD2.G 逆轉(zhuǎn)錄包膜質(zhì)粒和 psPAX2 包裝質(zhì)粒)按比例混合。(Blend the endotoxin-free inducible vector with validated packaging helper vectors.)
使用 BioVector? Transfection Reagent 細胞高效轉(zhuǎn)染試劑,共轉(zhuǎn)染處于對數(shù)生長期、狀態(tài)極佳的 293T 慢病毒包裝宿主細胞。(Co-transfect highly proliferative, low-passage 293T cells using targeted transfection matrices.)
轉(zhuǎn)染后 48 至 72 小時,小心收集富含高滴度慢病毒顆粒的細胞培養(yǎng)上清液。使用 0.45 um 的低蛋白結(jié)合濾膜過濾清除細胞碎片。(Harvest viral-rich supernatants at 48 to 72 hours post-transfection and pass through a 0.45 um polyethersulfone filter.)
利用冷凍超速離心機(如在 4 攝氏度下以 80000 乘以 g 超速離心 2 小時)或使用 BioVector? Lentivirus Concentration Kit 慢病毒濃縮試劑盒進行沉淀濃縮,分裝后立刻投入零下 80 攝氏度深冷保存,避免反復凍融導致滴度大跌。(Concentrate via ultracentrifugation or specialized precipitation chemistry, aliquot into working volumes, and flash-freeze at minus 80 degrees Celsius.)
B 階段:靶細胞感染與 G418 穩(wěn)定抗性株篩選 / Phase B: Host Infection and G418 Selection
根據(jù)實驗需求,將稀釋后的慢病毒液加入到鋪好的靶細胞(如人皮膚原代成纖維細胞)中,同時加入最終濃度為 6 至 8 ug/mL 的 BioVector? Polybrene(聚布雷烯感染增強劑),以顯著提高病毒吸附穿透效率。(Apply diluted lentivirus to target cells along with 6 to 8 ug/mL BioVector? Polybrene to improve structural viral attachment waves.)
感染 24 小時后,完全吸除帶有病毒的廢液,更換為新鮮的完全培養(yǎng)基。
感染 48 小時后,在培養(yǎng)基中加入經(jīng)過滴定篩選出的最優(yōu)致死濃度的 BioVector? G418 / Neomycin 篩選補劑(對于常規(guī)成纖維細胞,維持濃度通常在 200 到 600 ug/mL 之間)。(Introduce selected cytotoxic tiers of BioVector? G418/Neomycin to clear non-transduced cells, typical levels for mammalian fibroblasts range between 200 and 600 ug/mL.)
連續(xù)維持篩選 10 到 14 天,期間每 2 到 3 天更換一次含有 G418 的新鮮培養(yǎng)基,直到未感染的對照組細胞完全死亡。最終存活并發(fā)生克隆化鋪展的細胞群即為穩(wěn)定整合了該四環(huán)素誘導系統(tǒng)的多克隆穩(wěn)定株。(Maintain selection dynamics for 10 to 14 days until un-infected control cells are cleared, generating the stable responsive poly-clonal pool.)
5 穩(wěn)定株多西環(huán)素(Dox)誘導表達與功能質(zhì)控 / Dox-Induction and Assays Workflow
功能雙驗證紅線 / Critical Validation Milestone在未添加多西環(huán)素的維持狀態(tài)下,該穩(wěn)定株在熒光顯微鏡下必須表現(xiàn)為完全無綠色熒光(GFP陰性),且核形完全正常。如果在未加藥時即能在顯微鏡下觀察到部分細胞發(fā)出綠色熒光,證實細胞株存在嚴重的啟動子漏表達或培養(yǎng)血清中含有微量四環(huán)素類衍生物殘留,需立即更換使用 BioVector? Tet-System Approved FBS(四環(huán)素絕緣專用胎牛血清) 重新栽培篩選。In the absence of Dox, cells must show absolute absence of green fluorescence (GFP negative) with flat, elliptical nuclear envelopes. Any premature green tracking confirms high promoter leakage or tetracycline derivatives contaminating the base serum. Switch immediately to BioVector? Tet-System Approved FBS to re-establish proper control limits.
誘導啟動與動力學檢測流線 / Induction and Kinetic Validation Sequence
將篩選得到的穩(wěn)定細胞株按標準密度接種于多孔板或蓋玻片上,使其正常貼壁生長。
配制誘導工作液:吸取適量 BioVector? Doxycycline 儲備液,用含有四環(huán)素絕緣血清的完全培養(yǎng)基稀釋至最終工作濃度 100 到 1000 ng/mL(常用標準濃度為 500 ng/mL)。(Prepare the induction media by diluting BioVector? Doxycycline stock into feeding media to achieve a functional working tier of 100 to 1000 ng/mL.)
加入細胞中,將此時間點設(shè)為 0 小時,移入孵箱開始連續(xù)時間動力學培育。
熒光與形態(tài)學追蹤時間節(jié)點 (Imaging Verification Windows):
誘導后 12 到 24 小時:可在倒置熒光顯微鏡下觀察到綠色熒光自發(fā)亮起,主要集中聚集在細胞核的邊緣(Nuclear rim),此時核外形尚未發(fā)生嚴重畸變。(Green fluorescence awakens inside the nuclear rim, outlining the nuclear boundary prior to physical distortion.)
誘導后 48 到 72 小時:GFP-Progerin 表達達到峰值平臺期。此時,核膜開始大面積出現(xiàn)經(jīng)典的凹陷、折疊、起泡扭曲畸形。
功能衰老表型終點確證 (Downstream Senescence Assays):在加藥誘導后的第 5 天至第 7 天,可收集細胞執(zhí)行 BioVector? SA-beta-gal 細胞染色實驗(衰老陽性細胞比例通常會大幅飚升至 70% 以上),或提取總蛋白進行 Western Blot 免疫印跡,利用抗 Lamin A/C 特異性抗體檢測分子量約為 67 kDa 的 GFP-Progerin 融合表達條帶,作為該誘導功能系統(tǒng)合格交付的終點依據(jù)。(By days 5-7 post-induction, sample plates can be mapped using the BioVector? SA-beta-gal Chromogenic Kit to quantify senescent fractions, or run via Western Blot with anti-Lamin A antibodies to resolve the unique 67 kDa GFP-Progerin band.)

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