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BioVector® FRT (FR-T) 费舍尔大鼠甲状腺上皮细胞株技术档案
一、 背景与来源说明
FRT(Fischer Rat Thyroid,亦常写作 FR-T)细胞株衍生自费舍尔大鼠(Fischer 344 菌株)的正常甲状腺滤泡上皮细胞。与常规甲状腺细胞系(如 FRTL-5)不同,FRT 属于脱分化/未分化上皮形态,丧失了甲状腺刺激素(TSH)依赖性及摄碘功能,但保留了非常完好的极化上皮屏障 与极高的跨上皮电阻(TEER)。因此,该细胞株被广泛应用于转运体(如 CFTR、ENaC、TMEM16A)、离子通道以及电位/荧光测定高通量药物筛选(HTS)。
二、 细胞生物学特征
组织来源:大鼠(Rattus norvegicus,Fischer 344 菌株)甲状腺滤泡上皮细胞
生长特性:贴壁生长,多角形铺砖状极化上皮
关键功能特性:
高电性屏障:在 Transwell 滤膜上可形成极具完整性的紧密连接,TEER 可达 2000 – 4000 $\Omega \cdot \text{cm}^2$,且旁细胞通透性极低。
非 TSH 依赖:无需在培养基中额外添加 TSH、胰岛素或氢化可的松等甲状腺特异性激素组合。
主要表达模型应用:非常适合作为外源离子通道(如野生型与突变型 CFTR 基因、ANO1/TMEM16A)的异源表达宿主(FRT-CFTR 细胞系是囊性纤维化药物开发的金标准模型)。
三、 培养条件与传代指南
1. 完全培养基配方
FRT 细胞对培养基适配性良好,常用以下两种基础培养基:
标准配方(Coon's F-12 改良型或 F-12K):
基础培养基:Coon's Modified F-12 或 F-12K Medium
血清添加:5% – 10% 优质胎牛血清(FBS)
双抗:100 U/mL 青霉素 + 100 $\mu\text{g/mL}$ 链霉素
替代配方(DMEM/F-12 混合型):
DMEM/F-12 (1:1) + 10% FBS + 1% L-谷氨酰胺(适用于大多数常规维持与筛选实验)
2. 培养环境与传代规范
培养环境:37°C,5% $\text{CO}_2$,饱和湿度。
传代比例:1:3 至 1:6 传代,每周传代 2 次。
消化操作:使用 0.25% Trypsin - 0.02% EDTA,37°C 消化 3–5 分钟,待细胞脱落后加入含血清培养基终止消化,轻柔吹打分散。
四、 技术指标简表
| 参数 | 描述 |
| 细胞类型 | 大鼠甲状腺极化上皮细胞(用于离子通道表达与屏障研究) |
| 生物安全等级 | BSL-1 |
| 屏障电阻 (TEER) | 2000 - 4000 $\Omega \cdot \text{cm}^2$ (Transwell 上皮极化状态) |
| 倍增时间 | 约 20 - 24 小时 |
| 经典稳定转染株 | FRT-CFTR ($\Delta\text{F508}$ / WT), FRT-TMEM16A, FRT-ENaC |
| 主要研究领域 | 囊性纤维化药物高通量筛选、氯离子/钠离子通道功能分析、极化转运机制 |
BioVector® FRT (FR-T) Fischer Rat Thyroid Cell Line Datasheet
1. Background & Context
The FRT (Fischer Rat Thyroid, also designated as FR-T) cell line was derived from the normal thyroid follicular epithelium of Fischer 344 rats. Unlike standard thyroid cell lines (such as FRTL-5), FRT cells represent a dedifferentiated epithelial phenotype that lacks TSH dependency and iodide uptake capacity. However, they retain a highly developed, polarized epithelial barrier with extremely high transepithelial electrical resistance (TEER). Consequently, FRT serves as a premier heterologous expression platform for ion channels and transporters (e.g., CFTR, ENaC, TMEM16A) and fluorescence-based high-throughput drug screening (HTS).
2. Biological Characteristics
Organism & Tissue:Rattus norvegicus (Fischer 344 rat), thyroid follicular epithelium.
Growth Properties: Adherent, cobblestone-like polarized epithelial monolayer.
Key Functional Features:
High Electrical Barrier: Forms intact tight junctions on Transwell inserts, achieving TEER values of 2000 – 4000 $\Omega \cdot \text{cm}^2$ with minimal paracellular leakage.
Hormone Independence: Does not require thyroid-stimulating hormone (TSH), insulin, or hydrocortisone for routine maintenance.
Heterologous Expression Model: Ideal host for expressing wild-type and mutant ion channels (e.g., FRT-CFTR is the gold-standard cell model for Cystic Fibrosis drug discovery).
3. Culture & Handling Protocols
3.1 Complete Growth Medium Formulations
Standard Formulation (Coon's F-12 / F-12K):
Basal Medium: Coon's Modified F-12 or F-12K Medium
Serum Supplement: 5% – 10% Fetal Bovine Serum (FBS)
Antibiotics: 100 U/mL Penicillin + 100 $\mu\text{g/mL}$ Streptomycin
Alternative Formulation (DMEM/F-12):
DMEM/F-12 (1:1) + 10% FBS + 1% L-Glutamine
3.2 Incubation & Subculture Parameters
Incubation Conditions: 37°C, 5% $\text{CO}_2$, humidified atmosphere.
Split Ratio & Frequency: 1:3 to 1:6 split ratio, passaged 2 times per week.
Detachment: Treat with 0.25% Trypsin - 0.02% EDTA at 37°C for 3–5 minutes. Neutralize with complete serum-containing medium and gently dissociate into a single-cell suspension.
4. Technical Data Summary
| Parameter | Specification |
| Cell Type | Rat thyroid polarized epithelial cells |
| Biosafety Level | BSL-1 |
| TEER Value | 2000 - 4000 $\Omega \cdot \text{cm}^2$ (Polarized Transwell monolayer) |
| Doubling Time | Approx. 20 - 24 hours |
| Key Stable Derivatives | FRT-CFTR ($\Delta\text{F508}$ / WT), FRT-TMEM16A, FRT-ENaC |
| Primary Applications | High-Throughput Screening (HTS) for Cystic Fibrosis, ion channel kinetics, epithelial transport |
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