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HEK293-CTLA4
Tissue
胎兒腎臟
Disease
經轉化/永生化;不具致瘤性(以 HEK293 為背景)

Documents

HEK293-CTLA4

Cell line · Product number 305423

Disclaimer: The prices displayed for cell lines are exclusively for academic/not-for-profit customers. For commercial entitites the pr...

US$2,200.00excl. tax and shipping
Made to order
1

01General information

Description

免責聲明:所顯示的細胞系價格僅適用於學術/非營利客戶。商業機構的價格約為 6,250 歐元。
若您代表商業機構,或不確定應歸類於哪一類別,請 與我們聯絡。


HEK293-CTLA4 細胞系是一種穩定的重組 HEK293 細胞系,經基因工程改造後,能以中低水平表達 CTLA4 受體,每細胞約 4,000 個分子。 此細胞系採用 inscreenex 的「著陸墊」技術開發,確保 CTLA4 基因能精確且可重複地整合至特定且經預先驗證的基因組位點。CTLA4(亦稱 CD152)是一種免疫檢查點蛋白質,在調節 T 細胞活化方面扮演關鍵角色。 CTLA4 透過與刺激性受體 CD28 競爭,以結合抗原呈遞細胞上的 B7 分子(CD80 和 CD86),從而下調免疫反應,藉此維持自體耐受性並預防自體免疫。 CTLA4 是癌症免疫療法的關鍵靶點,特別是對於像伊匹木單抗(ipilimumab)這類藥物,其作用機制是透過阻斷此檢查點並活化 T 細胞,從而增強抗腫瘤免疫反應。

透過使用標靶特異性抗體進行流式細胞術,已確認此細胞系中 CTLA4 的表達,確保整個細胞群中受體密度可靠且一致。

Tissue
胎兒腎臟
Disease
經轉化/永生化;不具致瘤性(以 HEK293 為背景)
Applications
檢查點抑制劑研究;針對 CTLA-4 的抗體開發(伊匹木單抗、特雷木單抗的類似物);T 細胞共刺激實驗;免疫腫瘤學篩選;雙特異性抗體工程

02Classification

Organism
Human
Sex
Female
Growth properties
Adherent
GMO status
GMO-S1
GMO status details
GMO-S1: This HEK293 variant contains a CTLA-4 expression construct for immune checkpoint research. This classification applies only within Germany and may differ elsewhere.
Biosafety level
1

03Characteristics

Morphology
上皮樣
Cell type
上皮細胞
Doubling time
約 24 至 36 小時

04Identifiers

Citation
HEK293-CTLA4(Cytion 型號 305423)
NCBI TaxID
9606
Cellosaurus
CVCL_6G20

05Expression and susceptibility

Receptors expressed
CTLA4 (CD152)

06Handling and culture

Culture medium
RPMI 1640,含 2.0 mM 穩定谷氨醯胺,含 2.0 g/L NaHCO₃(Cytion 產品編號 820700a)
Incubation atmosphere

37°C,5% CO₂,加濕環境。

Supplements
在培養基中加入 10% FBS、1 mM 丙酮酸鈉、10 mM HEPES 及 1% NEAA。加入 Geneticin(G418-Sulfat),使最終濃度達到 1 mg/mL。
Dissociation reagent
胰蛋白酶-EDTA
Subculturing
針對常規貼壁細胞培養:將貼壁細胞中的舊培養基抽吸出來,並用PBS洗滌以去除殘留的培養基。抽吸掉PBS後,根據培養容器的大小加入適量的胰蛋白酶/EDTA溶液(例如:T25燒瓶為1毫升, T75 燒瓶則為 3 毫升),並於室溫或 37°C 下孵育,直至細胞脫落(5-10 分鐘)。 透過顯微鏡觀察細胞脫落狀況,必要時可輕輕敲擊培養容器以促使細胞脫落。細胞脫落後,加入完全培養基以失活胰蛋白酶/EDTA,輕輕重懸細胞,並將部分細胞懸液移入裝有新鮮培養基的新培養容器中。 將培養皿置於設定為 37°C 且含有 5% CO₂ 的培養箱中,並每 2-3 天更換一次培養基。
Split ratio
1 至 5
Seeding density
2 至 4 × 10⁴ 個細胞/cm²
Fluid renewal
每週 2 至 3 次
Post-thaw recovery

解凍後,將細胞以 1:2 至 1:3 的比例分裝至 T25 培養瓶中,並讓細胞從冷凍過程中恢復,並使其附著(針對貼壁培養)至少 24 小時。

Thawing and culturing
  1. Confirm that the vial remains deeply frozen upon delivery, as cells are shipped on dry ice to maintain optimal temperatures during transit.

  2. Upon receipt, either store the cryovial immediately at temperatures below -150°C to ensure the preservation of cellular integrity, or proceed to step 3 if immediate culturing is required.

  3. For immediate culturing, swiftly thaw the vial by immersing it in a 37°C water bath with clean water and an antimicrobial agent, agitating gently for 40-60 seconds until a small ice clump remains.

  4. Perform all subsequent steps under sterile conditions in a flow hood, disinfecting the cryovial with 70% ethanol before opening.

  5. Carefully open the disinfected vial and transfer the cell suspension into a 15 ml centrifuge tube containing 8 ml of room-temperature culture medium, mixing gently.

  6. Centrifuge the mixture at 300 x g for 3 minutes to separate the cells and carefully discard the supernatant containing residual freezing medium.

  7. Gently resuspend the cell pellet in 10 ml of fresh culture medium. For adherent cells, divide the suspension between two T25 culture flasks; for suspension cultures, transfer all the medium into one T25 flask to promote effective cell interaction and growth.

  8. Adhere to established subculture protocols for continued growth and maintenance of the cell line, ensuring reliable experimental outcomes.

07Quality control and cryopreservation

Sterility

透過基於 PCR 的檢測及基於發光原理的支原體檢測方法,排除支原體污染的可能性。

為確保無細菌、真菌或酵母菌污染,每日均會對細胞培養物進行目視檢查。

Freeze medium
作為冷凍保存培養基,我們使用完全生長培養基(含 FBS)+ 10% DMSO 以確保解凍後的存活率,或使用 CM-1 (Cytion 型號 800100),該培養基含有經優化的滲透保護劑和代謝穩定劑,可提升細胞恢復率並減輕冷凍誘導的壓力。
Storage conditions

若需長期保存,請將試管置於溫度約為 −150 至 −196 °C 的氣相液氮中。僅在轉移至液氮之前,可將試管暫時存放於 −80 °C 環境中,作為短期過渡步驟。

Shipping conditions

冷凍保存的細胞系會以乾冰冷藏,並裝於經驗證的隔熱包裝中,包裝內含有足夠的冷媒,以確保在運輸過程中溫度維持在約 −78 °C。收到貨物後,請立即檢查容器,並盡快將試管轉移至適當的儲存場所。

08Donor

Donor age
胎兒