BioVector? NIAS-AeAl-2 Mosquito (Aedes albopictus) Insect Cell Line / NIAS-AeAl-2 白紋伊蚊昆蟲細(xì)胞株

一 產(chǎn)品基本信息與細(xì)胞生物學(xué)背景

• 細(xì)胞名稱：NIAS-AeAl-2（亦常寫作 NIAS-AeAl 2 或 AeAl2）。

• Cellosaurus 檢索號(hào)：CVCL_Z549。

• 物種來(lái)源：白紋伊蚊（Aedes albopictus，常稱亞洲巨蚊或亞洲老虎蚊）。

• 組織源起與建立背景：

  NIAS-AeAl-2 細(xì)胞株是由日本著名昆蟲細(xì)胞培養(yǎng)及病毒學(xué)專家 Jun Mitsuhashi（三橋淳） 教授于 1981 年成功自白紋伊蚊的初孵幼蟲（Neonate larva）組織中分離并建立的突發(fā)性、自發(fā)永生化（Spontaneously immortalized）昆蟲連續(xù)細(xì)胞系。白紋伊蚊是全球范圍內(nèi)傳播登革熱（Dengue fever）、基孔肯雅熱（Chikungunya）、寨卡病毒（Zika virus）以及黃熱病等惡性蟲媒病毒（Arboviruses）的核心醫(yī)學(xué)媒介（Vector）。為了在體外不依賴活體昆蟲而精細(xì)模擬這些烈性病毒在宿主細(xì)胞內(nèi)的吸附、侵入、復(fù)制與釋放通路，NIAS-AeAl-2 應(yīng)運(yùn)而生。它作為一種經(jīng)典的醫(yī)學(xué)節(jié)肢動(dòng)物模式底盤，被國(guó)際各類媒介生物學(xué)實(shí)驗(yàn)室、蟲媒防制所廣泛采用。

• 核心表型與細(xì)胞生物學(xué)特征：

  • 形態(tài)學(xué)表現(xiàn)：貼壁生長(zhǎng)，但在匯合度極高或溫和機(jī)械震蕩下容易形成部分懸浮的混合生長(zhǎng)特性。在顯微鏡下，該細(xì)胞表現(xiàn)為高度異質(zhì)性，主要以圓形（Spherical）或多角形上皮樣（Epithelial-like）的細(xì)小細(xì)胞為主，夾雜少量短紡錘形細(xì)胞。細(xì)胞胞質(zhì)透亮，折光度好。

  • 生理生化特異性（核心質(zhì)控標(biāo)志）：經(jīng)系統(tǒng)生化鑒定，NIAS-AeAl-2 持續(xù)表現(xiàn)出極其強(qiáng)烈的乙酰膽堿酯酶（Acetylcholinesterase, AChE）催化活性。由于 AChE 是昆蟲神經(jīng)傳導(dǎo)通路的關(guān)鍵靶標(biāo)，這一特征使其在殺蟲劑（如有機(jī)磷、氨基甲酸酯類抗性）的神經(jīng)毒理學(xué)篩查中具有極高的特異性表達(dá)優(yōu)勢(shì)。

  • 生長(zhǎng)動(dòng)力學(xué)：群體倍增時(shí)間（Doubling time）約為 30 小時(shí)。

• 生物安全級(jí)別：1級(jí)（BSL-1）。（注：細(xì)胞本身無(wú)毒安全，但在接種特定蟲媒病毒或立克次體后，操作必須嚴(yán)格升級(jí)至 BSL-2 或 BSL-3 級(jí)實(shí)驗(yàn)室）。

二 核心科研價(jià)值與蟲媒醫(yī)學(xué)/毒理學(xué)轉(zhuǎn)化應(yīng)用

NIAS-AeAl-2 昆蟲細(xì)胞株在現(xiàn)代現(xiàn)代傳染病學(xué)、殺蟲劑研發(fā)和昆蟲內(nèi)分泌學(xué)中占據(jù)重要一席：

1. 蟲媒病毒與胞內(nèi)專性寄生原蟲/立克次體（Rickettsiae）的宿主特異性研究：

   用于解構(gòu)立克次體等胞內(nèi)病原體的宿主依耐性。研究表明，斑疹傷寒群立克次體（TGR）能夠在 NIAS-AeAl-2 細(xì)胞內(nèi)實(shí)現(xiàn)極為高效的增殖，而斑點(diǎn)熱群立克次體（SFGR）雖然能正常吸附并侵入該細(xì)胞，卻在胞內(nèi)受到強(qiáng)烈抑制無(wú)法生長(zhǎng)。通過將 NIAS-AeAl-2 與哺乳動(dòng)物 Vero 細(xì)胞進(jìn)行多維超微結(jié)構(gòu)對(duì)比，有助于揭示病原體如何逃逸節(jié)肢動(dòng)物先天免疫系統(tǒng)的分子病理機(jī)制。

2. 新型昆蟲生長(zhǎng)調(diào)節(jié)劑（IGRs）與蛻皮激素類似物（EcR 激動(dòng)劑）的虛擬與實(shí)體篩查：

   NIAS-AeAl-2 細(xì)胞天然穩(wěn)定表達(dá)昆蟲蛻皮激素受體（EcR）與超氣門蛋白（USP）形成的異源二聚體復(fù)合物。科研人員常以此為靶盤，進(jìn)行類似雙酰肼類（如 Tebufenozide 蟲酰肼）等新型綠色環(huán)保殺蟲劑的定量構(gòu)效關(guān)系（QSAR）分析與高通量細(xì)胞毒性/結(jié)合活性測(cè)定，極大加速了精準(zhǔn)靶向針對(duì)雙翅目害蟲藥物的研發(fā)。

3. 天然產(chǎn)物立體特異性細(xì)胞毒性測(cè)試：

   用于評(píng)估諸如 Arctigenin（牛蒡子苷元）等天然木脂素類立體異構(gòu)體對(duì)昆蟲細(xì)胞的精準(zhǔn)殺傷選擇性，通過監(jiān)測(cè)細(xì)胞內(nèi) 28S rRNA 基因的轉(zhuǎn)錄水平異常，揭示天然外源生物堿驅(qū)蚊、殺蚊的分子毒理機(jī)制。

三 實(shí)驗(yàn)室昆蟲細(xì)胞復(fù)蘇、常溫貼壁培養(yǎng)、常規(guī)傳代與質(zhì)控標(biāo)準(zhǔn)步驟

極其重要的操作警告：與常規(guī)哺乳動(dòng)物細(xì)胞（如 HeLa, Vero）不同，NIAS-AeAl-2 屬于昆蟲細(xì)胞，日常維護(hù)絕對(duì)禁止使用 37 ℃ 孵箱！它具有不依賴 $CO_2$（非碳酸氫鹽緩沖體系）的生長(zhǎng)特性，必須在常溫、敞口無(wú)菌環(huán)境下進(jìn)行穩(wěn)定培養(yǎng)。

1. 專用昆蟲培養(yǎng)基配置與生長(zhǎng)環(huán)境

• 基礎(chǔ)培養(yǎng)基：經(jīng)典的 Mitsuhashi-Maramorosch (MM) 昆蟲培養(yǎng)基，或采用高級(jí)針對(duì)雙翅目蚊類優(yōu)化的 VP12 培養(yǎng)基 / Schneider's Drosophila Medium。

• 完全培養(yǎng)基典型配方：

  • Mitsuhashi-Maramorosch (MM) 基底培養(yǎng)基

  • 加 10% - 15% 優(yōu)質(zhì)滅活胎牛血清（FBS）（注：昆蟲細(xì)胞對(duì)血清質(zhì)控敏感，建議使用同一批次血清）

  • 加 1% 青霉素-鏈霉素雙抗。

• 培養(yǎng)物理常數(shù)：25 攝氏度 - 28 攝氏度（推薦標(biāo)定值為 27 ℃），無(wú)需 $CO_2$ 氣體注入（常溫空氣環(huán)境即可），保持環(huán)境濕度平衡。

2. 冷凍昆蟲細(xì)胞的復(fù)蘇與柔和接種步序

1. 提前在生物安全柜中準(zhǔn)備好干凈的 T25 培養(yǎng)瓶，注入 5 mL 預(yù)熱至 27 ℃（嚴(yán)禁 37 ℃） 的完全昆蟲培養(yǎng)基。

2. 從液氮罐中取出 NIAS-AeAl-2 凍存管，迅速投入 27 ℃ - 30 ℃ 溫水中快速搖晃，在 1-2 分鐘內(nèi)令管內(nèi)冰塊完全融化。

3. 用 75% 酒精噴灑凍存管外壁進(jìn)行嚴(yán)密消毒，移入生物安全柜。

4. 將細(xì)胞懸液緩慢滴加至盛有 4 mL 預(yù)熱完全培養(yǎng)基的 15 mL 離心管中，輕柔顛倒一次。

5. 以 800 - 1000 rpm（約 150 g，昆蟲細(xì)胞較脆弱，需低轉(zhuǎn)速）離心 5 分鐘。

6. 小心抽干含有 DMSO 的上清液，加入 1 mL 新鮮完全培養(yǎng)基。

7. 用移液槍極其輕柔地吹打 1-2 次，使細(xì)胞均勻散開。

8. 將細(xì)胞接種至 T25 瓶中，補(bǔ)充完全培養(yǎng)基，輕柔搖勻，置于 27 ℃ 恒溫生化培養(yǎng)箱中暗培養(yǎng)。

9. 復(fù)蘇 24 小時(shí)后，進(jìn)行全量換液，清除未貼壁的死細(xì)胞和細(xì)胞碎片。

3. 日常貼壁常規(guī)傳代操作（溫和吹打法/機(jī)械刮除法）

• 傳代時(shí)機(jī)：當(dāng)圓形/上皮樣細(xì)胞在瓶底密集成片，匯合度（Confluency）達(dá)到 85% - 90% 時(shí)必須傳代。由于昆蟲細(xì)胞之間貼壁錨定相對(duì)比哺乳動(dòng)物細(xì)胞弱，傳代通常無(wú)需使用強(qiáng)烈的胰蛋白酶（Trypsin）消化，過度消化極易引發(fā)昆蟲細(xì)胞質(zhì)膜破裂。傳代頻率通常為每 4 - 6 天一次。

• 操作流程：

  1. 直接吹打法（推薦）：吸除 T25 瓶?jī)?nèi)的舊培養(yǎng)基（若有懸浮成分可先離心收集），加入 2-3 mL 新鮮的完全昆蟲培養(yǎng)基。使用 1 mL 或 5 mL 無(wú)菌移液管，面向貼壁細(xì)胞表面進(jìn)行輕柔、多次的沖洗吹打（Gentle pipetting）。由于該細(xì)胞附著力適中，大部分健康細(xì)胞會(huì)隨著液體沖刷成片整齊脫落。

  2. 酶學(xué)輔助（僅在極難脫落時(shí)使用）：若發(fā)現(xiàn)局部貼壁過緊，可使用無(wú)鈣鎂 PBS 漂洗后，加入 1 mL 低濃度的 0.05% Trypsin - EDTA 消化液或 Collagenase，室溫下（25 ℃）孵育 1-2 分鐘。一旦看到細(xì)胞變圓，立刻加入 2 倍體積的含血清完全培養(yǎng)基終止消化，吸出離心。

  3. 將收集到的細(xì)胞懸液在 1000 rpm 下離心 5 分鐘，棄去酶解液。

  4. 加入新鮮完全培養(yǎng)基重懸，按照 1:2 至 1:4 的傳代比例分裝入新的培養(yǎng)瓶中，補(bǔ)足完全培養(yǎng)基，放回 27 ℃ 孵箱中繼續(xù)擴(kuò)增。

4. 細(xì)胞長(zhǎng)期保存標(biāo)準(zhǔn)

• 凍存液配方：80% 新鮮完全昆蟲培養(yǎng)基 加 10% 優(yōu)質(zhì)胎牛血清（FBS） 加 10% 最高分析級(jí)二甲基亞砜（DMSO）。

• 冷凍降溫規(guī)范：

  1. 收集形態(tài)飽滿、處于對(duì)數(shù)生長(zhǎng)旺盛期的 NIAS-AeAl-2 細(xì)胞，離心收集沉淀。

  2. 用配制好的冷凍液懸浮，調(diào)整細(xì)胞終密度至 每毫升 3,000,000 - 5,000,000 個(gè)活細(xì)胞（昆蟲細(xì)胞凍存密度建議略高于哺乳動(dòng)物細(xì)胞）。

  3. 分裝入無(wú)菌專用凍存管，立刻移入標(biāo)準(zhǔn)程序降溫盒（Mr. Frosty）。

  4. 將降溫盒投入 -80 ℃ 超低溫冰箱中慢速梯度降溫過夜（確保達(dá)到 $-1\text{ }^\circ\text{C/min}$ 的標(biāo)稱降溫速率）。

  5. 24 小時(shí)內(nèi)，迅速將凍存管轉(zhuǎn)移并鎖死在液氮罐（-196 ℃）中長(zhǎng)期存放。嚴(yán)禁在 -80 ℃ 冰箱長(zhǎng)期擱置，以防微小的溫度震蕩導(dǎo)致昆蟲細(xì)胞膜的超微磷脂雙分子層物理崩塌。

Part 2 English Section

I General Information and Cell Biological Background

• Cell Line Name: NIAS-AeAl-2 (also alternative standard nomenclature variations include NIAS-AeAl 2 or AeAl2).

• Cellosaurus Accession No.: CVCL_Z549.

• Organism Source: Asian tiger mosquito (Aedes albopictus) (also known as Stegomyia albopicta).

• Tissue Extract and Derivation History:

  The NIAS-AeAl-2 continuous cell line was successfully isolated and established in 1981 by the distinguished entomologist and insect cell specialist Jun Mitsuhashi from the tissues of neonate larvae of Aedes albopictus.

  Aedes albopictus serves globally as an aggressive arthropod vector responsible for transmitting high-consequence arboviruses, including Dengue virus, Chikungunya virus, and Zika virus. The NIAS-AeAl-2 platform bypasses the requirement for live-insect colonies, enabling investigators to safely model viral adsorption, cellular entry, replication, and egress kinetics inside a controlled in vitro節(jié)肢動(dòng)物 microenvironment.

• Core Morphological Phenotype and Cellular Variables:

  • Morphological Structure: Primarily adherent monolayer growth, with a tendency to form semi-suspended cell aggregates under high density or mild mechanical agitation. Under phase-contrast inverted profiling, the line displays noticeable cellular heterogeneity, dominated by small spherical or polygonal epithelioid-like cells paired with a minority of short spindle elements. The cell matrix displays clear cytoplasm and excellent refractivity.

  • Biochemical Characterization (Core Quality Control Identity): Enzymatic profiling confirms that NIAS-AeAl-2 maintains a robust and highly persistent level of acetylcholinesterase (AChE) catalytic activity. Because AChE represents the primary functional neuromuscular target disrupted by conventional chemical controls, this property grants the line unique advantages for neurotoxicological profiling and evaluating insecticide resistance cascades (e.g., organophosphates).

  • Growth Kinetics: The measured population doubling time scales to approximately 30 hours.

• Biosafety Threshold: Rated at Biosafety Level 1 (BSL-1). Note: The baseline cell line is completely safe; however, the containment configuration must be upgraded to BSL-2 or BSL-3 immediately upon inoculation with targeted live arboviruses or pathogenic rickettsiae.

II Strategic Research Value and Translational Vector Biology Applications

The NIAS-AeAl-2 line serves as a crucial preclinical model for arboviral tracing, pesticide discovery, and arthropod molecular biology:

1. Tracing Arbovirus Host Dependency and Intracellular Rickettsial Co-Evolution:

   Utilized to investigate host-dependent expansion mechanics of intracellular pathogens. Preclinical data indicates that typhus group rickettsiae (TGR) replicate efficiently within NIAS-AeAl-2 cell matrices, whereas spotted fever group rickettsiae (SFGR) successfully execute adherence and internal invasion but are blocked from replication. Comparative ultrastructural analyses between NIAS-AeAl-2 and mammalian Vero cell setups help map how vector-borne pathogens evade the primitive innate immune loops of hematophagous insects.

2. High-Throughput Screening of Insect Growth Regulators (IGRs) and Ecdysone Agonists:

   The line constitutively expresses functional insect ecdysone receptors (EcR) and ultraspiracle proteins (USP) organized as stable heterodimeric complexes. Investigators leverage this signaling framework to analyze the quantitative structure-activity relationships (QSAR) of next-generation ecofriendly diacylhydrazine (DAH) insecticides (e.g., Tebufenozide), accelerating the deployment of targeted dipteran larvicides.

3. Stereospecific Cytotoxicity Assays of Natural Botanicals:

   Deployed to investigate the enantiomeric selectivity of natural compounds (such as lignan stereoisomers like Arctigenin) against vector cells. By tracing transcriptional variations in ribosomal 28S rRNA gene sequences, researchers can deconstruct the molecular toxicological profiles that drive biological repellents and botanical insecticides.

III Laboratory Thawing, Atmospheric Adaptation, Subculturing, and Maintenance Routines

CRITICAL ENVIRONMENTAL WARNING: Unlike traditional mammalian cells (e.g., HeLa, Vero), NIAS-AeAl-2 is an insect line. NEVER place these cells inside a 37 °C incubator! Furthermore, because they utilize a non-bicarbonate buffering system that functions independently of ambient $CO_2$ tension, they must be cultivated under open atmospheric air settings at room temperature.

1. Basal Media Formulation and Physical Incubator Calibration

• Basal Medium Base: Standard Mitsuhashi-Maramorosch (MM) insect medium, or premium optimized dipteran variations such as VP12 medium or Schneider's Drosophila Medium.

• Complete Growth Matrix Formulation:

  • Basal Mitsuhashi-Maramorosch (MM) matrix base

  • Supplemented with 10% - 15% premium heat-inactivated Fetal Bovine Serum (FBS)

  • Fortified with 1% standard Penicillin-Streptomycin dual antibiotic cocktail.

• Physical Environmental Settings: Calibrate the incubator strictly to 25 °C - 28 °C (with a target processing benchmark of 27 °C). Ensure 0% $CO_2$ gas injection (ambient air environment), and maintain controlled humidity levels to prevent desiccation.

2. Cryovial Thawing and Monolayer Recovery Protocol

1. Pre-warm a sterile T25 culture flask filled with 5 mL of complete growth medium to 27 °C (NEVER 37 °C) inside the biosafety workstation.

2. Retrieve the NIAS-AeAl-2 cryovial from liquid nitrogen storage and submerge it instantly within a 27 °C - 30 °C water bath. Agitate continuously to melt the internal matrix within 60 - 120 seconds.

3. Mist the exterior shell with 75% ethanol before transfer into the sterile hood.

4. Transfer the cell suspension slowly into a 15 mL conical tube containing 4 mL of pre-warmed complete insect medium, mixing via gentle inversion.

5. Centrifuge the suspension at a gentle velocity of 800 - 1000 rpm (~150 g) for 5 minutes. Insect cells have vulnerable mechanical structures; avoid elevated g-forces.

6. Aspirate the toxic DMSO-laden supernatant and add 1 mL of fresh complete growth medium.

7. Re-suspend the cell pellet gently using a pipette (1 - 2 strokes max) to avoid sheer stress.

8. Dispense the matrix into the prepared T25 flask, mix gently, and transfer into a 27 °C constant climate incubator.

9. Perform a complete media change 24 hours post-thaw to discard dead cellular fragments and unattached debris.

3. Routine Monolayer Subculturing and Passaging Protocol (Mechanical Pipetting Method)

• Confluency Assessment Control: Subculturing workflows must be initialized when the adherent epithelioid sheets achieve 85% - 90% confluency. Because insect cells naturally present lower focal adhesion kinetics compared to mammalian models, passaging ordinarily requires no aggressive trypsinization. Unregulated enzymatic treatment risks lysing the delicate insect plasma membranes. Expect a standard passaging cycle every 4 - 6 days.

• Passaging Execution Steps:

  1. Direct Mechanical Pipetting (Standard Recommendation): Remove the spent culture fluid (centrifuge the fluid to recover suspended cells if visible). Dispense 2 - 3 mL of fresh complete insect medium onto the monolayer. Using a sterile 5 mL pipette, perform gentle, sequential washes across the adherent cell sheet (Gentle pipetting). The hydrodynamic shear is sufficient to cause the healthy cell layers to detach cleanly as unified sheets.

  2. Enzymatic Assistance (Strictly Reserved for Tight Adherence): If localized clusters remain tightly bound, rinse once with calcium/magnesium-free PBS, then apply 1 mL of chilled, low-concentration 0.05% Trypsin-EDTA or specialized collagenase at room temperature (25 °C) for 1 - 2 minutes. The moment cells round up, instantly add 2 volumes of serum-fortified complete growth medium to stop enzymatic cleavage, then aspirate the liquid.

  3. Spin down the cell suspension at 1000 rpm for 5 minutes and discard the processing supernatant.

  4. Re-suspend the pellet in fresh complete insect medium and distribute into new flasks using standard split ratios of 1:2 to 1:4. Top off with complete medium and return to the 27 °C incubator.

4. Long-Term Cryopreservation Parameters

• Cryoprotectant Preservation Formula: 80% fresh complete insect growth medium supplemented with 10% premium FBS and packed with 10% analytical-grade Dimethyl Sulfoxide (DMSO).

• Controlled Gradient Freezing Protocol:

  1. Harvest highly viable, log-phase NIAS-AeAl-2 cultures displaying robust morphology. Centrifuge and isolate the pellet.

  2. Re-suspend the cells in the pre-chilled cryoprotectant matrix to achieve an elevated target cell density of 3,000,000 to 5,000,000 cells per milliliter. Insect cell profiles demand slightly higher density parameters during freezing to ensure structural recovery.

  3. Transfer the solution into sterile cryovials and place them immediately into a standard controlled-rate cooling container (e.g., Mr. Frosty).

  4. Deposit the cooling container inside a -80 °C ultra-low freezer overnight to execute a steady cooling rate of -1 °C/minute.

  5. Within 24 hours, quickly transfer the vials into liquid nitrogen storage tanks (-196 °C) for long-term preservation. Do not store vials indefinitely inside a -80 °C freezer, as minor temperature variations can compromise membrane integrity and degrade specific cellular phenotypes.

Related Video Resource

For laboratory validation of insect cell architectures, you can review this Insect Cell Culture Protocol video which displays continuous transfection and environmental incubation workflows relevant to managing sensitive non-mammalian cell lines.

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