General Information of This Peptide
Peptide ID
PEP00071
Peptide Name
Kb-C08
Structure
Sequence
KLLKKNLK-Aib-LAALAKKILGGGC-NH2
Peptide Type
Linear
Receptor Name
Cell membrane
PDC Transmembrane Types Cell-penetrating peptides (CPPs)
Formula
C104H193N29O24S
Isosmiles
[H]NCCCC[C@H](N[H])C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCCN[H])C(=O)N[C@@H](CCCCN[H])C(=O)N[C@@H](CC(=O)N[H])C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCCN[H])C(=O)NC(C)(C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN[H])C(=O)N[C@@H](CCCCN[H])C(=O)N[C@]([H])(C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)NCC(=O)NCC(=O)N[C@@H](CS[H])C(=O)O)[C@@H](C)CC
InChI
InChI=1S/C104H193N29O24S/c1-20-62(14)84(101(154)130-72(45-56(2)3)89(142)115-53-82(136)113-52-81(135)114-54-83(137)119-79(55-158)102(155)156)132-93(146)70(37-25-31-43-109)122-90(143)67(34-22-28-40-106)120-86(139)65(17)118-94(147)73(46-57(4)5)125-87(140)64(16)116-85(138)63(15)117-95(148)77(50-61(12)13)131-103(157)104(18,19)133-100(153)71(38-26-32-44-110)124-97(150)76(49-60(10)11)128-99(152)78(51-80(112)134)129-92(145)69(36-24-30-42-108)121-91(144)68(35-23-29-41-107)123-96(149)75(48-59(8)9)127-98(151)74(47-58(6)7)126-88(141)66(111)33-21-27-39-105/h56-79,84,158H,20-55,105-111H2,1-19H3,(H2,112,134)(H,113,136)(H,114,135)(H,115,142)(H,116,138)(H,117,148)(H,118,147)(H,119,137)(H,120,139)(H,121,144)(H,122,143)(H,123,149)(H,124,150)(H,125,140)(H,126,141)(H,127,151)(H,128,152)(H,129,145)(H,130,154)(H,131,157)(H,132,146)(H,133,153)(H,155,156)/t62-,63-,64-,65-,66-,67-,68-,69-,70-,71-,72-,73-,74-,75-,76-,77-,78-,79-,84-/m0/s1
InChIKey
ZLBNCPVGHRGKST-JUZUOIPZSA-N
Pharmaceutical Properties
Molecule Weight
2265.934
Polar area
873.63
Complexity
2264.449399
xlogp Value
-5.1551
Heavy Count
158
Rot Bonds
92
Hbond acc
31
Hbond Donor
31
Each Peptide-drug Conjugate Related to This Peptide
Full Information of The Activity Data of The PDC(s) Related to This Peptide
Kb-CC08 [Investigative]
Revealed Based on the Cell Line Data
Click To Hide/Show 9 Activity Data Related to This Level
Experiment 1 Reporting the Activity Data of This PDC [1]
Indication Colon cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
0.14 ± 0.02 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

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In Vitro Model Colon carcinoma HCT 116 cell CVCL_0291
Experiment 2 Reporting the Activity Data of This PDC [1]
Indication Colon cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
0.35 ± 0.02 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

   Click to Show/Hide
In Vitro Model Colon carcinoma HCT-116/CPT cell CVCL_0291
Experiment 3 Reporting the Activity Data of This PDC [1]
Indication Breast cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
0.41 ± 0.02 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

   Click to Show/Hide
In Vitro Model Invasive breast carcinoma MCF-7 cell CVCL_0031
Experiment 4 Reporting the Activity Data of This PDC [1]
Indication Gastric cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
0.47 ± 0.01 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

   Click to Show/Hide
In Vitro Model Gastric carcinoma SGC-7901 cell CVCL_0520
Experiment 5 Reporting the Activity Data of This PDC [1]
Indication Breast cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
1.03 ± 0.06 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

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In Vitro Model Invasive breast carcinoma of no special type MCF7/C4 cell CVCL_GX99
Experiment 6 Reporting the Activity Data of This PDC [1]
Indication Gastric cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
1.06 ± 0.07 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

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In Vitro Model Human papillomavirus-related cervical adenocarcinoma SGC-7901/CPT cell CVCL_0520
Experiment 7 Reporting the Activity Data of This PDC [1]
Indication Colon cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
14.8 ± 0.9 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

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In Vitro Model Normal NCM460 cell CVCL_0460
Experiment 8 Reporting the Activity Data of This PDC [1]
Indication Gastric cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
15.2 ± 0.7 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

   Click to Show/Hide
Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

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In Vitro Model Normal GES1 cell CVCL_EQ22
Experiment 9 Reporting the Activity Data of This PDC [1]
Indication Liver cancer
Efficacy Data Half Maximal Inhibitory Concentration (IC50)
16.1 ± 0.5 µM
Administration Time 48 h
Evaluation Method MTT assay
MOA of PDC
Cationic anticancer peptides (CAPs) refer to peptide-based molecules possessing a net positive charge, allowing them to preferentially combined with cancer cells which exhibit an overabundance of anionic components on their surface. Cationic peptides additionally induce cell membrane destabilization through carpet-like, toroidal pore or sinking raft et al. mechanism, or penetrate cell membrane and act on cellular sub-structures. Besides, cell-penetrating peptides (CPPs) represent a special subset of CAPs, renowned for their rapid and low-toxic cellular translocation abilities, making them promising vehicles for drug delivery. Therefore, CAPs are emerging as a class of potential anticancer agents and gaining widespread attention by researchers. As reported, the construction of bioactive peptides with cytotoxic payloads via a chemical linker provides a kind of prodrugs known as peptide-drug conjugates (PDCs), which represents an efficient approach to address the limitations of small molecules by leveraging the properties of peptides. In previous study, we have discovered the CAP of KM8-Aib (sequence: Lys-Leu-Leu-Lys-Lys-Asn-Leu-Lys-Aib-Leu-Ala-Ala-Leu-Ala-Lys-Lys-Ile-Leu-NH2), which derived from venom peptide Mastoparan, exhibiting favorable antiproliferative effect against several cancer cells but less toxic to benign cells. Herein, we attempted to integrate CPT with KM8-Aib, obtaining a series of peptide-CPT conjugates, to improve the solubility, selectivity of CPT, and achieve enhanced therapeutic outcomes. Based on preliminary in vitro assays, the PDC Kb-CC07 demonstrated exceptional selective cytotoxicity against various cancer cell lines, including drug-resistant variants, surpassing that of other conjugates. The solubility of Kb-CC07 was also significantly increased, which is ˜ 100 fold higher than that of CPT. In addition, we evaluated the in vivo antitumor efficacy of Kb-CC07 via nude-xenograft model. It is showed that mice treated with Kb-CC07 had substantially lower tumor volumes and minimum organ toxicities than CPT-treated group. As such, Kb-CC07 is suggested to be a promising anticancer agent and warrant thorough exploration.

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Description
MTT assay was preformed to measure the in vitro cytotoxicities of the compounds against cancer cells (HCT-116, SGC-7901, MCF-7, HCT-116/CPT, SGC-7901/CPT and MCF-7/C4) and benign cells (NCM460, GES-1 and LO2). As present in Table 1, all the peptides (Kb-C01, 0207) exhibited certain selective anticancer activities, which are comparable to their parent counterpart KM8-Aib. The target PDCs (Kb-CC01, 0207) were further obtained by coupling the peptides with CPT, displaying markedly improved antiproliferative activities and selectivities against cancer cell lines over CPT. Studies have revealed that cancer cell membranes are negatively charged due to the presence of substantial amounts of acid phospholipids. Therefore, positively charged CAPs are capable of binding to cancer cell surface through electrostatic interactions, making them specific to cancer cells. In this project, since the PDCs were composed of CAP KM8-Aib and CPT, they potentially inherited the antineoplastic activities of KM8-Aib against cancer cells, as well as low toxicities to non-malignant cells.

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In Vitro Model Amelanotic melanoma LO #2 cell CVCL_C7SD
References
Ref 1 Design, synthesis and bioactivity investigation of peptide-camptothecin conjugates as anticancer agents with a potential to overcome drug resistance. Int J Pharm. 2023 Oct 15;645:123402. doi: 10.1016/j.ijpharm.2023.123402. Epub 2023 Sep 9.