前 言
大脑复杂的细胞组成和特定的结构，使得体外建模难度极大。近年来大脑类器官概括了大脑发育的许多关键特征，激发全球神经学领域相关科研人员的兴趣，研究成果不断的发表于高分期刊，将脑类器官用于各种生理和病理研究。细胞因子作为类器官培养基中的添加试剂，可以引导细胞按特定器官谱系进行分化。为助力脑类器官的培养与分化，义翘神州可提供人EGF、FGF2、NOG、BMP4等一系列脑类器官培养相关产品。
01 脑类器官研究新进展
目前大多数脑部模型主要是人类死后脑组织、非人灵长类动物组织或者体外2D细胞。由于资源限制和动物模型的物种差异性等原因，使脑类器官成为潜在研究脑部生理和病理的模型。脑类器官主要源自胚胎干细胞（ESC）或者诱导性多能干细胞（iPSC）。对于体外神经生物学和神经发育障碍的疾病的研究，也会用到不同部位的脑类器官，比如前脑、中脑、海马脑类器官等。目前使用脑类器官模型涉及到阿尔茨海默症、帕金森病、自闭症、精神分裂等，甚至包括渐冻症、结节性硬化症等罕见病。
体外神经生物学和神经发育障碍疾病模型的脑类器官 |
Type of organoid | Disease modeled/potential application |
Cerebral/early brain organoids | Genetically caused microcephaly Zika virus mediated microcephaly Miller–Dieker syndrome |
Midbrain organoids | Potential to model Parkinson's disease |
Hypothalamus organoids | Potential to model hormonal and metabolic disorders including Prader–Willi syndrome |
Adenohypophysis organoids | Potential to model pituitary dysfunction |
Hippocampus organoids | Potential to model cognitive dysfunctions due to Alzheimer's disease |
Cerebellum organoids | Potential to model SCA and Dandy–Walker syndrome |
Dorsaltelencephalon organoids | ASD |
Forebrain assembloids | Timothy syndrome |
ASD, autism spectrum disorders; POMC, pro-opiomelanocortin.
（源自：https://doi.org/10.1002/bies.201900011）
02细胞因子在脑类器官中的应用
细胞因子在类器官培养过程中发挥重要作用。在多能干细胞（PSC）培养中加入了FGF2构建3D脑类器官模型。对于不同部位的脑类器官的培养，会加入不同的细胞因子，比如对于用于研究脊髓小脑共济失调疾病的小脑类器官培养中，会加入FGF2、FGF19、SDF1等细胞因子。
用于生成特异性脑类器官的因子摘要 |
Type of organoid | Cultured with |
Midbrain organoids | Wnt activators and SMAD inhibitors |
Hypothalamus organoids | Inhibitors that blocks TGF‐β pathways BMP-4 ligand and Wnt agonists |
Adenohypophysis organoids | DAPT, SAG, BIO, BMP4, dorsomorphin, Wnt4, Wnt5, FGF8, Nodal, iWP2 |
Hippocampus organoids | Wnt inhibitor IWR1e, TGF‐β inhibitor SB431542, 10% FBS, GSK3 inhibitor CHIR99021, BMP4 |
Cerebellum organoids | SB431542, FGF2, FGF19, SDF1 |
Dorsaltelencephalon organoids | Noggin, FGF2, rhDKK1, EGF, ascorbic acid, BDNF, GDNF, cAMP |
Dorsaltelencephalon organoids | Dorsomorphin, SB431542, FGF2, EGF Subpallium: IWP2, SHH agonist SAG, BDNF, NT3, allopregnalone, retinoic acid Pallium: BDNF, NT3 |
Photosensitive organoids |
BDNF |
Retinal organoids | IWR1e, Matrigel, 10% FBS, SAG, CHIR99021, retinoic acid |
Hypothalamus organoids | SMAD, BMP, Nodal and activin signaling pathway inhibitors |
Cerebellar plate neuroepithelium | FGF2,4,8, SAG, retinoic acid, BDNF, GDNF, NT3 |
BDNF, brain‐derived neurotrophic factor; BMP, bone morphogenetic protein; cAMP, cyclic adenosine monophosphate; EGF, epidermal growth factor; FBS, fetal bovine serum; FGF, fibroblast growth factor; GDNF, glial cell‐derived neurotrophic factor. （源自：https://doi.org/10.1002/bies.201900011）
✦义翘神州细胞因子产品数据
Human FGF2 Protein, Cat: GMP-10014-HNAE
高纯度：
≥ 95 % as determined by SDS-PAGE.
结合活性
Cell proliferation assay using Balb/C 3T3 mouse embryonic fibroblasts. The specific activity is >1,000 IU/μg.
Human Noggin Protein, Cat: 10267-HNAH
高纯度：
≥95% as determined by SDS-PAGE. ≥95% as determined by SEC-HPLC.
高批间一致性
Inhibit BMP4-induced alkaline phosphatase production by MC3T3E1 mouse preosteoblast cells.
☆：SDS-PAGE & SEC-HPLC
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