Abstract
Purpose
To establish a platform for the possibility of effective and safe delivery of Temozolomide (TMZ) to brain via surface engineered (polyamidoamine) PAMAM dendrimer for the treatment of glioblastoma.
Methods
The present study aims to investigate the efficacy of PAMAM-chitosan conjugate based TMZ nanoformulation (PCT) against gliomas in vitro as well as in vivo. The prepared nanoconjugated formulation was characterized by 1H NMR, FT-IR spectroscopy and for surface morphological parameters. The reported approach was also designed in such a way to ensure toxicity before in vivo delivery through conducting the hemolytic study.
Result
Surface morphology was found as per nanoformulation via size, pdi and zeta potential measurement. PCT was more efficacious in terms of IC50 values compared to pure TMZ against U-251 and T-98G glioma cell lines. The in vivo pharmacokinetic parameters proved sustained release fashion such as half-life (t1/2) of 22.74 h (PCT) rather than15.35 h (TMZ) only. Higher concentration was found in heart than brain in bio-distribution studies. This study exhibits the potential applicability of dendrimer and CS in improving the anticancer activity and delivery of TMZ to brain.
Conclusion
The attractive ex vivo cytotoxicity against two glioma cell lines; U-251 and T-98G and phase solubility studies of TMZ revealed remarkable results. In vivo studies of prepared nanoformulation were significant and promising that explored the double concentration of TMZ in brain due to surface functionality of dendrimer. The reported work is novel and non- obvious as none of such approaches using chitosan anchored dendrimer for TMZ delivery has been reported earlier.
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Abbreviations
- AFM:
-
Atomic force microscopy
- BBB:
-
Bloood brain barrier
- CBC:
-
Complete blood count
- CS:
-
Chitosan
- DMSO:
-
Dimethylsulphoxide
- EDC:
-
1-(3-dimethylaminopropyl)-3-ethyl carbodiimide
- MCH:
-
Mean corpuscular hemoglobin
- MCHC:
-
Mean corpuscular hemoglobin concentration
- MCV:
-
Mean corpuscle volume
- PAMAM:
-
Polyamidoamine
- PCS:
-
PAMAM-chitosan conjugates
- PCT:
-
Temozolamide loaded PAMAM-chitosan conjugates formulation
- SEM:
-
Scanning electron microscopy
- TMZ:
-
Temozolamide
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors would like to acknowledge the financial support received from University Grants Commission, New Delhi, India to Dr. Umesh Gupta as UGC-Start up Research Grant and Mr. Ashok Kumar Sharma as UGC-National Research Fellowship. Authors also acknowledge Rungta College of Pharmaceutical Science and Research, Bhilai, Chhattisgarh, India for supporting necessary facilities to conduct animal studies.
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Sharma, A.K., Gupta, L., Sahu, H. et al. Chitosan Engineered PAMAM Dendrimers as Nanoconstructs for the Enhanced Anti-Cancer Potential and Improved In vivo Brain Pharmacokinetics of Temozolomide. Pharm Res 35, 9 (2018). https://doi.org/10.1007/s11095-017-2324-y
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DOI: https://doi.org/10.1007/s11095-017-2324-y