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中国生物工程杂志

China Biotechnology
China Biotechnology  2018, Vol. 38 Issue (7): 40-49    DOI: 10.13523/j.cb.20180706
    
The Optimization of A Novel Human-derived Cell-penetrating Peptide Used for Anti-cancer Treatment
Si LI1,Yi-zhou ZHAI1,Yu-ting LU2,Fu-jun WANG2,3,Jian ZHAO1,**()
1 State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, Chain
2 Zhejiang Reachall Pharmaceutical Co. Ltd, Dongyang 322100,Chain
3 Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai 201203,Chain
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Abstract  

Cell-penetrating peptides (CPPs) have been widely used in decades for its ability to carry many macromolecular drugs across cell-membrane to exert their effects. Midkine (MK) is a heparin-binding growth factor with a heparin-binding domain (HBD). The HBD in MK that is rich in basic amino acids (MK-S0) was fused with enhanced green fluorescence protein (EGFP) and then it was found that MK-S0 could deliver EGFP into cells, and its transportation capacity is much higher that classical CPPs (such as Tat). After the sequence optimization on MK-S0, MK-Δ4 whose trans-membrane ability was increased about 16-fold than MK-S0 was obtained. The trans-membrane ability of MK-Δ4 was also suitable for a variety of tumor cells. The further investigation of endocytic pathways on MK-Δ4 was shown that MK-Δ4 penetrates cell-membrane through interacting with heparin sulfate on the cell surface and then via macropinocytosis. The results of cell growth inhibition by MTT method showed that MK-Δ4 could enhance the inhibitory effect of a ribosome-inactivating protein-MAP30 about 5.8-fold in HeLa cells which is significantly enhance the anti-tumor activity of MAP30. It was suggested that MK-Δ4 optimized from heparin-binding domain MK is a novel human-derived CPP with high efficiency, and is a new drug vector for anti-tumor therapy.



Key wordsMidkine      Heparin-binding domain      Cell-penetrating peptide      Drug delivery      Anti-tumor drug     
Received: 20 March 2018      Published: 13 August 2018
ZTFLH:  Q71  
Corresponding Authors: Jian ZHAO     E-mail: zhaojian@ecust.edu.cn
Cite this article:

Si LI,Yi-zhou ZHAI,Yu-ting LU,Fu-jun WANG,Jian ZHAO. The Optimization of A Novel Human-derived Cell-penetrating Peptide Used for Anti-cancer Treatment. China Biotechnology, 2018, 38(7): 40-49.

URL:

https://manu60.magtech.com.cn/biotech/10.13523/j.cb.20180706     OR     https://manu60.magtech.com.cn/biotech/Y2018/V38/I7/40

Fig.1 SDS-PAGE analysis of fusion protein EGFP-MK-S0 M:Low molecule weight protein marker; 1:Uninduced E.coli (DE3); 2:Induced E.coli (DE3) (EGFP-MK-S0);3:The supernatane of induced E.coli (DE3) (EGFP-MK-S0); 4:The inclusion body of induced E.coli (DE3) (EGFP-MK-S0); 5: Elution; 6: Elution of 20mmol/L imidazole; 7: Elution of 200mmol/L imidazole; 8: Purfied EGFP-MK-S0 for two times dilution; 9:Purfied EGFP-MK-S0
Fig.2 Fluorescence microscopy and flow cytometry among EGFP-MK-S0 and other three CPPs Time-response (a) and concentration-response (b) of fusion protein EGFP-MK-S0; The transporting efficiency was analyzed by FCM among different CPPs (c,d)
Fig.3 Penetrating ability of MK-S0 mutants (a)Fluorescence detection of EGFP-MK-S0 and EGFP-MK-ΔS0 (b)Structural modeling of MK-S0 (c)Fluorescence detection of mutants (d)Flow cytometry of mutants (e),(f)Fluorescence microscopy detection of MK-Δ4
Name Sequence Fusion protein
MK-S0 TKPCTPKTKAKAKAKKGKGKD EGFP-MK-S0
MK-Δ1 GKPCGPKGKVKSKIKKGKGKS EGFP-MK-Δ1
MK-Δ2 TKPCTPCKTKAKAKAKAKAKAKKGKGKD EGFP-MK-Δ2
MK-Δ3 TKPCTPRTRARARARRGRGRD EGFP-MK-Δ3
MK-Δ4 TKPCTPRTRARARARARARARRGRGRD EGFP-MK-Δ4
Table 1 Mutant sequence of MK-S0
Fig.4 SDS-PAGE analysis of fusion protein EGFP-MK-Δ4 M:Low molecule weight protein marker; 1:Uninduced E.coli (DE3); 2:Induced E.coli (DE3) (EGFP-MK-Δ4); 3:The supernatane of induced E.coli (DE3) (EGFP-MK-Δ4); 4:The inclusion body of induced E.coli (DE3) (EGFP-MK-Δ4); 5: Elution; 6:Elution of 20mmol/L imidazole; 7:Elution of 200mmol/L imidazole; 8:Elution of 500mmol/L imidazole; 9: Elution of 1mol/L imidazole; 10: Purified EGFP-MK-Δ4; 11:Purified EGFP-MK-S4
Fig.5 Penetrating ability of EGFP-MK-Δ4 into cells of variable origin
Fig.6 Effect of endocyticc inhibitors on penetrating ability of EGFP-MK-Δ4
Fig.7 Growth effect of EGFP,EGFP-MK-Δ4 to HeLa cells
Fig.8 SDS-PAGE analysis of fusion protein MAP30-MK-Δ4 M:Low molecule weight protein marker; 1: Uninduced E.coli (DE3); 2:Induced E.coli (DE3) (MAP30-MK-Δ4); 3:The supernatane of induced E.coli (DE3) (MAP30-MK-Δ4); 4:The inclusion body of induced E.coli (DE3) (MAP30-MK-Δ4); 5: Elution; 6: Elution of 20mmol/L imidazole; 7: Elution of 200mmol/L imidazole; 8: Elution of 500mmol/L imidazole; 9: Elution of 1mol/L imidazole; 10:Purfied MAP30-MK-Δ4 ; 11:Purfied MAP30-MK-Δ4
Fig.9 Effects of fusion protein on tumor cell viability (a)The cytotoxicity of MAP30 and MAP30-MK-Δ4 to HeLa (b)The cytotoxicity of MAP30 and MAP30-MK-Δ4 to SMMC (c)The cytotoxicity of MAP30 and MAP30-MK-Δ4 to MGC803
Tumor cells IC50 (μmol/L)
MAP30 MAP30-MK-Δ4 Increased fold
HeLa 2.576 0.444 5.8
SMMC 3.028 0.572 5.3
MGC803 2.367 0.580 4.1
Table 2 Half maximal inhibitory concentration IC50 of fusion protein to tumor cells
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