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Comparison of two self-assembled macromolecular prodrug micelles with different conjugate positions of SN38 for enhancing antitumor activity.

Liu Y, Piao H, Gao Y, Xu C, Tian Y, Wang L, Liu J, Tang B, Zou M, Cheng G - Int J Nanomedicine (2015)

Bottom Line: A larger AUC0-24 of CS-(20s)SN38 was observed when compared to CS-(10s)SN38 (P<0.05).Both of the novel self-assembled chitosan-SN38 prodrugs demonstrated superior anticancer activity to CPT-11 in the CT26 xenograft BALB/c mouse model.In conclusion, both macromolecular prodrug micelles improved the in vivo conversion rate and antitumor activity of SN38, but the prodrug in which C20-OH was conjugated to macromolecular materials could be a more promising platform for SN38 delivery.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, Liaoning Province, People's Republic of China.

ABSTRACT
7-Ethyl-10-hydroxycamptothecin (SN38), an active metabolite of irinotecan (CPT-11), is a remarkably potent antitumor agent. The clinical application of SN38 has been extremely restricted by its insolubility in water. In this study, we successfully synthesized two macromolecular prodrugs of SN38 with different conjugate positions (chitosan-(C10-OH)SN38 and chitosan-(C20-OH)SN38) to improve the water solubility and antitumor activity of SN38. These prodrugs can self-assemble into micelles in aqueous medium. The particle size, morphology, zeta potential, and in vitro drug release of SN38 and its derivatives, as well as their cytotoxicity, pharmacokinetics, and in vivo antitumor activity in a xenograft BALB/c mouse model were studied. In vitro, chitosan-(C10-OH)SN38 (CS-(10s)SN38) and chitosan-(C20-OH) SN38 (CS-(20s)SN38) were 13.3- and 25.9-fold more potent than CPT-11 in the murine colon adenocarcinoma cell line CT26, respectively. The area under the curve (AUC)0-24 of SN38 after intravenously administering CS-(10s)SN38 and CS-(20s)SN38 to Sprague Dawley rats was greatly improved when compared with CPT-11 (both P<0.01). A larger AUC0-24 of CS-(20s)SN38 was observed when compared to CS-(10s)SN38 (P<0.05). Both of the novel self-assembled chitosan-SN38 prodrugs demonstrated superior anticancer activity to CPT-11 in the CT26 xenograft BALB/c mouse model. We have also investigated the differences between these macromolecular prodrug micelles with regards to enhancing the antitumor activity of SN38. CS-(20s)SN38 exhibited better in vivo antitumor activity than CS-(10s)SN38 at a dose of 2.5 mg/kg (P<0.05). In conclusion, both macromolecular prodrug micelles improved the in vivo conversion rate and antitumor activity of SN38, but the prodrug in which C20-OH was conjugated to macromolecular materials could be a more promising platform for SN38 delivery.

No MeSH data available.


Related in: MedlinePlus

FT-IR spectra of (A) chitosan, (B) CS-(10s)SN38, (C) CS-(20s)SN38, (D) SN38, and (E) mixture of SN38 and chitosan.Abbreviations: CS-(10s)SN38, chitosan-(C10-OH)SN38; CS-(20s)SN38, chitosan-(C20-OH)SN38; FT-IR, Fourier transform infrared; SN38, 7-Ethyl-10-hydroxycamptothecin.
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f4-ijn-10-2295: FT-IR spectra of (A) chitosan, (B) CS-(10s)SN38, (C) CS-(20s)SN38, (D) SN38, and (E) mixture of SN38 and chitosan.Abbreviations: CS-(10s)SN38, chitosan-(C10-OH)SN38; CS-(20s)SN38, chitosan-(C20-OH)SN38; FT-IR, Fourier transform infrared; SN38, 7-Ethyl-10-hydroxycamptothecin.

Mentions: The FT-IR spectra of chitosan, SN38, the mixture of chitosan and SN38, CS-(10s)SN38, and CS-(20s)SN38 are shown in Figure 4. The spectrum of CS indicated that the peaks at 1,633 cm−1 and 1,520 cm−1 were due to the C–O stretching vibration of the carbonyl group and the N–H bending vibration of the secondary amine (amide I and II), respectively (original spectra of chitosan could be found in Figure S3). Compared with CS, the new signals at 1,656 cm−1 and 1,566 cm−1 were assigned to the new amide link for amide I and II. In addition, peaks at 1,598 cm−1 and 1,600 cm−1 were observed in the spectra of CS-(10s)SN38 and CS-(20s)SN38, representing the characteristic vibration of the benzene skeleton. All of the results showed that the grafting of SN38 onto the amino groups of CS had been successful.


Comparison of two self-assembled macromolecular prodrug micelles with different conjugate positions of SN38 for enhancing antitumor activity.

Liu Y, Piao H, Gao Y, Xu C, Tian Y, Wang L, Liu J, Tang B, Zou M, Cheng G - Int J Nanomedicine (2015)

FT-IR spectra of (A) chitosan, (B) CS-(10s)SN38, (C) CS-(20s)SN38, (D) SN38, and (E) mixture of SN38 and chitosan.Abbreviations: CS-(10s)SN38, chitosan-(C10-OH)SN38; CS-(20s)SN38, chitosan-(C20-OH)SN38; FT-IR, Fourier transform infrared; SN38, 7-Ethyl-10-hydroxycamptothecin.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4376263&req=5

f4-ijn-10-2295: FT-IR spectra of (A) chitosan, (B) CS-(10s)SN38, (C) CS-(20s)SN38, (D) SN38, and (E) mixture of SN38 and chitosan.Abbreviations: CS-(10s)SN38, chitosan-(C10-OH)SN38; CS-(20s)SN38, chitosan-(C20-OH)SN38; FT-IR, Fourier transform infrared; SN38, 7-Ethyl-10-hydroxycamptothecin.
Mentions: The FT-IR spectra of chitosan, SN38, the mixture of chitosan and SN38, CS-(10s)SN38, and CS-(20s)SN38 are shown in Figure 4. The spectrum of CS indicated that the peaks at 1,633 cm−1 and 1,520 cm−1 were due to the C–O stretching vibration of the carbonyl group and the N–H bending vibration of the secondary amine (amide I and II), respectively (original spectra of chitosan could be found in Figure S3). Compared with CS, the new signals at 1,656 cm−1 and 1,566 cm−1 were assigned to the new amide link for amide I and II. In addition, peaks at 1,598 cm−1 and 1,600 cm−1 were observed in the spectra of CS-(10s)SN38 and CS-(20s)SN38, representing the characteristic vibration of the benzene skeleton. All of the results showed that the grafting of SN38 onto the amino groups of CS had been successful.

Bottom Line: A larger AUC0-24 of CS-(20s)SN38 was observed when compared to CS-(10s)SN38 (P<0.05).Both of the novel self-assembled chitosan-SN38 prodrugs demonstrated superior anticancer activity to CPT-11 in the CT26 xenograft BALB/c mouse model.In conclusion, both macromolecular prodrug micelles improved the in vivo conversion rate and antitumor activity of SN38, but the prodrug in which C20-OH was conjugated to macromolecular materials could be a more promising platform for SN38 delivery.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, Liaoning Province, People's Republic of China.

ABSTRACT
7-Ethyl-10-hydroxycamptothecin (SN38), an active metabolite of irinotecan (CPT-11), is a remarkably potent antitumor agent. The clinical application of SN38 has been extremely restricted by its insolubility in water. In this study, we successfully synthesized two macromolecular prodrugs of SN38 with different conjugate positions (chitosan-(C10-OH)SN38 and chitosan-(C20-OH)SN38) to improve the water solubility and antitumor activity of SN38. These prodrugs can self-assemble into micelles in aqueous medium. The particle size, morphology, zeta potential, and in vitro drug release of SN38 and its derivatives, as well as their cytotoxicity, pharmacokinetics, and in vivo antitumor activity in a xenograft BALB/c mouse model were studied. In vitro, chitosan-(C10-OH)SN38 (CS-(10s)SN38) and chitosan-(C20-OH) SN38 (CS-(20s)SN38) were 13.3- and 25.9-fold more potent than CPT-11 in the murine colon adenocarcinoma cell line CT26, respectively. The area under the curve (AUC)0-24 of SN38 after intravenously administering CS-(10s)SN38 and CS-(20s)SN38 to Sprague Dawley rats was greatly improved when compared with CPT-11 (both P<0.01). A larger AUC0-24 of CS-(20s)SN38 was observed when compared to CS-(10s)SN38 (P<0.05). Both of the novel self-assembled chitosan-SN38 prodrugs demonstrated superior anticancer activity to CPT-11 in the CT26 xenograft BALB/c mouse model. We have also investigated the differences between these macromolecular prodrug micelles with regards to enhancing the antitumor activity of SN38. CS-(20s)SN38 exhibited better in vivo antitumor activity than CS-(10s)SN38 at a dose of 2.5 mg/kg (P<0.05). In conclusion, both macromolecular prodrug micelles improved the in vivo conversion rate and antitumor activity of SN38, but the prodrug in which C20-OH was conjugated to macromolecular materials could be a more promising platform for SN38 delivery.

No MeSH data available.


Related in: MedlinePlus