General Information of This Peptide-drug Conjugate (PDC)
PDC ID
PDC_00351
PDC Name
TPP-DOX-AP2H
PDC Status
Investigative
Indication
In total 1 Indication(s)
Tumor
Structure
Peptide Name
AP2H
 Peptide Info 
Receptor Name
Mitochondria-eating protein (SPATA18)
 Receptor Info 
Drug Name
Doxorubicin
 Drug Info 
Therapeutic Target
DNA topoisomerase 2-alpha (TOP2A)
 Target Info 
Linker Name
Hydrazone bond
 Linker Info 
Peptide Modified Type
The modification of binding with chemical macromolecules
Modified Segment
Hydrazine group
Ternimal Modification
N-terminal modification
Formula
C101H129N19O25P+
#Ro5 Violations (Lipinski): 4 Molecular Weight 2040.225
Lipid-water partition coefficient (xlogp) 0.4958
Hydrogen Bond Donor Count (hbonddonor) 22
Hydrogen Bond Acceptor Count (hbondacc) 28
Rotatable Bond Count (rotbonds) 52
Full List of Activity Data of This Peptide-drug Conjugate
Discovered Using Cell Line-derived Xenograft Model
Click To Hide/Show 1 Activity Data Related to This Level
Experiment 1 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Average tumor volume shrunk
55%
Administration Time 18 days
Administration Dosage 20 µM
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
The average tumor volume shrunk by 55% at day 18 compared with that of the control group (Figure 4c).
In Vivo Model HepG2 tumor xenograft model.
Revealed Based on the Cell Line Data
Click To Hide/Show 6 Activity Data Related to This Level
Experiment 1 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Cell viability
17%
Administration Time 48 h
Administration Dosage 20 µM
Evaluation Method MTT assay
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
PDC killed most HepG2 cells with a high efficiency of 83% and left HEK293 cells unaffected.
In Vitro Model Hepatoblastoma Hep-G2 cell CVCL_0027
Experiment 2 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Cell viability
40%
Administration Time 48 h
Administration Dosage 20 µM
Evaluation Method MTT assay
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
PDC maintained almost the same cytotoxicity against MCF-7/ADR cells and MCF-7/WT cells
In Vitro Model Invasive breast carcinoma MCF-7 cell CVCL_0031
Experiment 3 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Cell viability
45%
Administration Time 48 h
Administration Dosage 20 µM
Evaluation Method MTT assay
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
PDC maintained almost the same cytotoxicity against MCF-7/ADR cells and MCF-7/WT cells
In Vitro Model Invasive breast carcinoma MCF7/ADR cell CVCL_0031
Experiment 4 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Cell viability
100%
Administration Time 48 h
Administration Dosage 20 µM
Evaluation Method MTT assay
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
PDC killed most HepG2 cells with a high efficiency of 83% and left HEK293 cells unaffected.
In Vitro Model Normal HEK293 cell CVCL_0045
Experiment 5 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
15 µM
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
For PDC, its IC50 values against MCF-7/WT (15 uM) and MCF-7/ADR (18 uM) are almost the same, confirming its effectiveness in bypass drug resistance.
In Vitro Model Invasive breast carcinoma MCF-7 cell CVCL_0031
Experiment 6 Reporting the Activity Data of This PDC [1]
Indication Tumor
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
18 µM
MOA of PDC
Initiated by the interaction between AP2H and membrane-anchored LAPTM4B protein, PDC specifically recognized and bound cancer cells. The receptor-mediated endocytic pathway then led to the delivery of PDC to lysosomes. The low pH environment in lysosomes efficiently cut the hydrazone bond and released TPP-DOX. The successful escape from lysosomes enabled further transportation of TPP-DOX to mitochondria directed by targeting group TPP. Because TPP-DOX is highly active in producing ROS and mitochondria are prone to oxidative damage, the disruption in the electron transport chain and ATP synthesis finally lead to mitochondrial dysfunction and cell death. With dual-targeting ability, PDC can effectively bypass the interaction with P-gp. Meanwhile, due to the energy-dependent expression feature of P-gp, the damage to mitochondria inhibit P-gp expression, thus inhibit the efflux. (9) The targeted and mitochondria interrupted cell damaging pathway allow PDC to exert toxicity both wild type and drug resistant

   Click to Show/Hide
Description
For PDC, its IC50 values against MCF-7/WT (15 uM) and MCF-7/ADR (18 uM) are almost the same, confirming its effectiveness in bypass drug resistance.
In Vitro Model Invasive breast carcinoma MCF7/ADR cell CVCL_0031
References
Ref 1 Peptide-Guided System with Programmable Subcellular Translocation for Targeted Therapy and Bypassing Multidrug Resistance. Anal Chem. 2019 Feb 5;91(3):1880-1886. doi: 10.1021/acs.analchem.8b03598. Epub 2018 Dec 24.