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2017 ; 7
(1
): 11242
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A pH-dependent Antibacterial Peptide Release Nano-system Blocks Tumor Growth in
vivo without Toxicity
#MMPMID28894233
Cao J
; Zhang Y
; Shan Y
; Wang J
; Liu F
; Liu H
; Xing G
; Lei J
; Zhou J
Sci Rep
2017[Sep]; 7
(1
): 11242
PMID28894233
show ga
In this study, we designed a nano-system where a novel antibacterial peptide
RGD-hylin a1 with reduced hemolysis than the commonly studied melittin was loaded
onto mesoporous silica (HMS). We found out that the designed nano-system,
RGD-hylin a1-HMS, released RGD-hylin a1 in a pH-dependent manner. It caused
apoptosis of cancer cells at low dosage of the antibacterial peptide at pH?=?5.5,
but was safe to the cells at pH?=?7. The hemolytic activity of RGD-hylin a1
itself was reduced by 50~100% by the nano-system depending on the dosage. When
this nano-system was administered to tumor-bearing mice at low dosage via
intravenous injection, the growth of the solid tumor was blocked by the RGD-hylin
a1-HMS nano-system with a 50-60% inhibition rate relative to the PBS-treated
control group in terms of tumor volume and weight. Further, the hemolytic
activity of RGD-hylin a1 was completely eliminated within the delivery system
with no other side effects observed. This study demonstrates that this smart
pH-dependent antibacterial peptide release nano-system has superior potential for
solid tumor treatments through intravenous administration. This smart-releasing
system has great potential in further clinical applications.