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2018 ; 9
(1
): 1680
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Optically-controlled bacterial metabolite for cancer therapy
#MMPMID29700283
Zheng DW
; Chen Y
; Li ZH
; Xu L
; Li CX
; Li B
; Fan JX
; Cheng SX
; Zhang XZ
Nat Commun
2018[Apr]; 9
(1
): 1680
PMID29700283
show ga
Bacteria preferentially accumulating in tumor microenvironments can be utilized
as natural vehicles for tumor targeting. However, neither current chemical nor
genetic approaches alone can fully satisfy the requirements on both stability and
high efficiency. Here, we propose a strategy of "charging" bacteria with a
nano-photocatalyst to strengthen their metabolic activities. Carbon nitride
(C(3)N(4)) is combined with Escherichia coli (E. coli) carrying nitric oxide (NO)
generation enzymes for photo-controlled bacterial metabolite therapy (PMT). Under
light irradiation, photoelectrons produced by C(3)N(4) can be transferred to E.
coli to promote the enzymatic reduction of endogenous NO(3)(-) to cytotoxic NO
with a 37-fold increase. In a mouse model, C(3)N(4) loaded bacteria are perfectly
accumulated throughout the tumor and the PMT treatment results in around 80%
inhibition of tumor growth. Thus, synthetic materials-remodeled microorganism may
be used to regulate focal microenvironments and increase therapeutic efficiency.