Biodegradable FePS3 nanoplatform for environment friendly remedy of osteosarcoma by mixture of gene and NIR-II photothermal remedy | Journal of Nanobiotechnology


Iron, purple phosphorus, sulfur and iodine powders (99.99%), and NMP (N-Methyl-2-pyrrolidone) have been purchased from Aladdin Reagents. PLL-PEG, PLL-PEG-FA have been bought from Ruixi Co., Ltd (Xi’an, China). Anti-miR-NC, the detrimental management of microRNAs inhibitor, miR-19a inhibitor (anti-miR-19a), and Cy5.5-labeled anti-miR-19a have been from RiboBio Co., Ltd (Guangzhou, China). FITC and Cy5.5 fluorescence dyes have been obtained from Lumiprobe (Maryland, USA). The cell tradition reagents together with DMEM mediem and fetal bovine serum (FBS) and so forth have been from Gibco (AG, Switzerland). Beyotime (Shanghai, China) supplied Calcein-AM, PI and DAPI staining options, and Cell Counting Equipment-8 (CCK-8). The antibodies for immunostaining have been from Cell Signaling Know-how (Maryland, USA). Different chemical reagents at analytical reagent grade have been instantly used.

Synthesis of FePS3 crystals and nanosheets

The FePS3 crystals have been ready utilizing chemical vapor transport (CVT) approach. Excessive-purity iron, purple phosphorus and sulfur powders with the molar ratio of 1:1:3 (round 1.37 g in whole), and the transport agent (iodine, 20 mg) have been crammed collectively in a quartz ampule with dimeter of 18 mm, size of 100 mm, wall thickness of two mm adopted by seal below excessive vacuum (under 5 × 10− 4 Torr). Subsequently, the sealed quartz ampule was positioned in a two-zone furnace and heated to 700 °C for five days. Lastly, the two-zone furnace was cooled to room temperature in 8 h, and the majority FePS3 crystals have been obtained.

The FePS NSs have been synthesized from bulk FePS3 crystals by a liquid exfoliation technique. Briefly, 100 mg of FePS3 crystals have been absolutely floor after which exfoliated by probe sonication in 100 mL of NMP for 12 h in a shower at 6 °C. After sonication, the precipitate between 9000 and 14,000 rpm was collected to acquire FePS NSs. Earlier than utilizing, washing with ethanol and water 3 times every was carried out.

Functionalization of FePS NSs

1 mg of PLL-PEG or PLL-PEG-FA was combined with 200 µg of FePS NSs dispersed in 5 mL water, sonicated for 30 min adopted by stirring for 3 h. The obtained FePS@PP and FePS@PPF have been washed to take away the surplus PLL-PEG and PLL-PEG-FA. Afterwards, 0.6 nmol of anti-miR-NC or anti-miR-19a was added to 100 µg of FePS@PPF in 2 mL water, and magnetically stirred for 4 h at room temperature. In the end, functionalized anti-miRNA/FePS@PPF was collected after washing and centrifugating.

To synthesize FITC-labeled FePS@PPF, 0.1 mg of FePS@PPF and 1.0 mg of FITC dye have been dispersed in 10 mL of water, magnetically stirred for 4 h. Then the combination was washed with water to take away unreacted FITC.


JEM-3200FS (JEOL, Japan) was used to take the transmission electron microscopy (TEM) pictures at 200 kV. Measurement distribution and zeta potential have been decided utilizing Zetasizer 3000 HAS (Malvern Ltd., UK). Atomic pressure microscopy (AFM) was carried out on Bruker Multimode 8 with the drop-cast flakes on a Si/SiO2 substrate. XRD (X-ray diffraction) evaluation was carried out by the SmartLab X-ray diffractometer (Rigaku, Japan). The UV-Vis-NIR absorption have been carried out by U-3900 spectrophotometer (Hitachi, Japan). The focus of FePS NSs was measured with ICP-OES (7000DV, PerkinElmer, USA). Fourier Remodel infrared spectroscopy (FT-IR) spectra have been detected by MDTC-EQ-M13-01 (Thermo, USA).

Photothermal results

The FePS@PPF dispersed in water (0, 15, 25, 50 µg/mL) have been uncovered to 1064 nm laser for 10 min with an influence density of 1.0 W/cm2. The temperature was monitored utilizing the Ti27 infrared thermal imager (Fluke, USA). Moreover, 50 µg/mL of FePS@PPF answer was irradiated at 0.5, 1.0, and 1.5 W/cm2. The temperature adjustments through the rise and pure cooling processes have been recorded.

Photothermal conversion effectivity of FePS@PPF

The photothermal conversion effectivity (η) will be calculated by Eqs. 14.

$$eta {textual content{ = (hS(Tmax}}, – ,{textual content{Tsurr)}}, – ,{textual content{Qdis)/I(1}}, – ,{textual content{10}}, {^{-text{A}}})$$


$$hS = {textual content{ }}sum mC_{{textual content{p}}} /tau _{{textual content{S}}}$$


$$tau S{textual content{ }} = {textual content{ }} – {textual content{ }}t/lntheta$$


$$theta = {textual content{ }}left( {T – T_{{{textual content{surr}}}} } proper)/left( {T_{{{textual content{max}}}} – T_{{{textual content{surr}}}} } proper)$$


the place h is warmth switch coefficient, S is the world of container, τS is the time fixed of system warmth switch, m is mass of 1 g, Cp (4.2 Jg–1 °C–1) is particular warmth capability of water, and τS = 263.77 s is obtained from Fig. 2f. hS is obtained from Eq. 2 (hS = 1*4.2/263.77 = 15.92 mW/°C), Qdis is measured independently to be 74.84 mW, Tmax is the equilibrium temperature of FePS@PPF and Tsurr is the ambient temperature. I is 1.0 W/cm2 and A refers to absorbance of FePS@PPF at 1064 nm (A1064 = 0.568). Accordingly, η = {[15.92*(49.0-27.4)-74.84]/[1000*(1–10− 0.568)]}*100%= 47.1%.

Intracellular uptake

5 × 104 cells per dish of the HOS cells have been seeded and cultured in confocal dishes in a single day. After incubation with 25 µg/mL of FITC-labeled FePS@PPF or Cy5.5-labeled anti-miR-19a/FePS@PPF for six h, washing with PBS was carried out and fixing the cells with 4% PFA. The nuclei have been stained by DAPI. The photographs have been taken utilizing confocal microscope (Leica stellaris 5, GER).

In vitro antitumor effectivity

HOS and MG63 cells have been seeded with 1 × 104 cells per properly in 96-well plates and cultured in a single day. Completely different concentrations of FePS@PPFs (0, 6, 12, 25 and 50 µg/mL) have been added and handled cells for 48 h. Then, a CCK-8 assay was used to find out cell viabilities. For antitumor assay, the medium containing 25 µg/mL (FePS@PPF focus) of anti-miR-NC/FePS@PPF or anti-miR-19a/FePS@PPF was used to deal with cells for six h. Then, the samples have been eliminated by including contemporary medium, and uncovered to 1064 nm laser for 10 min, 1.0 W/cm2. Incubation for an additional 48 h was carried out, and CCK-8 assay was carried out to research cell viability. As well as, cells have been handled as described above and co-stained with Calcein-AM/PI (5 µg/mL) at 37 oC for 10 min. Subsequently, fluorescent pictures indicating stay/lifeless cells have been taken by IX71 (Olympus, Japan). The cell apoptosis after completely different therapies was measured by movement cytometry (BD FACSCelesta) utilizing the Annexin V-FITC Apoptosis Equipment.

Western blot

Cells have been lysed and the protein was extracted with radio immunoprecipitation lysis buffer on ice. BCA assay was used to find out the protein concentrations and Western blot was carried out utilizing 12% SDS-PAGE. Bovine serum albumin was used to dam the polyvinylidene fluoride membranes (0.45 mm) after which the membranes have been incubated with completely different main antibodies in a single day at 4 °C. After washing, the first antibodies-coated membranes have been conjugated with secondary antibody at room temperature for 1 h. Lastly, membranes have been detected by chemiluminescence imaging (Bio-Rad, Singapore) and the bands have been normalized to beta-actin degree.

Animals and building of xenograft tumor fashions

Balb/c nude mice, which have been feminine and about 4–6 weeks previous have been bought from an organization of Laboratory Animal Know-how (Charles River Co., Ltd., China) and raised in SPF laboratory. The animal experiments have been accredited by Administrative Committee of SIAT (Shenzhen Institutes of Superior Know-how, Chinese language Academy of Sciences) answerable for supervising of animal analysis.

HOS cells (1 × 108/mL) have been dispersed in PBS and the cell suspension (100 µL) was seeded into the proper again facet of mice. The system: quantity (V) = size × width2/2 was used to calculate the quantity of tumor.

In vivo biodistribution and photothermal results

Cy5.5-labeled FePS@PP or FePS@PPF was intravenously injected with 10 mg/kg FePS NSs for tumor-bearing mouse. The in vivo fluorescence pictures have been acquired by Caliper IVIS Spectrum (PerkinElmer, USA) at designed time level (3, 6, 12, 24, 48 h). The ex vivo fluorescence of coronary heart, liver, spleen, lung, kidney and tumor was detected at 24 h post-administration. All pictures have been analyzed and calculated by Dwelling Picture software program.

Mice have been anaesthetized after 24 h-injection of PBS, FePS@PP or FePS@PPF, and the tumor websites have been irradiated by 1064 nm laser for five min, 1.0 W/cm2. The temperature of tumor web site was monitored utilizing an infrared thermal imager.

In vivo synergistic anti-tumor results

When the tumor fashions have been established, the mice have been divided randomly into six teams with 5 mice in every group: (1) PBS (management), (2) anti-miR-NC/FePS@PPF, (3) anti-miR-19a/FePS@PPF, (4) PBS + NIR, (5) anti-miR-NC/FePS@PPF + NIR, (6) anti-miR-19a/FePS@PPF + NIR. On day 0, 100 µL of PBS, anti-miR-NC/FePS@PPF or anti-miR-19a/FePS@PPF was injected through the tail vein on the focus of 10 mg/kg FePS NSs as soon as every week. On day 1 and day 7, mice in group (4), (5) and (6) have been anaesthetized and uncovered to 1064 nm laser (1.0 W/cm2, 5 min). The tumor size, width and physique weight have been measured each 2 days. On day 14, mice have been sacrificed, tumor in addition to predominant organs (coronary heart, liver, spleen, lung, kidney) have been collected and stuck in 4% PFA for histopathological and immunohistochemical analyses.

In vivo clearance and biosafety analysis

At 0-, 1-, 3-, 7- and 14-days after intravenous injection of FePS@PPF (10 mg/kg), the principle organs have been eliminated, digested in HNO3 and analyzed by ICP-OES. The concentrations of parts Fe, P and S in the principle organs have been decided to evaluate the biodegradability of FePS@PPF.

On day 14, 0.6 mL of blood pattern was collected from venous plexus of eye socket into heparinized tubes. The serum samples have been obtained by centrifugation at 3000 rpm, 15 min, 4 ℃. The blood biochemistry assay which is said with liver and renal perform was detected at Wuhan Servicebio Know-how Co., Ltd. The H&E staining of sections have been carried out to watch the tissue morphology.

Statistical evaluation

All quantitative outcomes have been introduced as imply ± SD from three unbiased experiments. Statistical comparisons have been analyzed by SPSS software program (Chicago, USA) by Tukey’s post-test and one-way ANOVA evaluation. *p < 0.05, **p < 0.01.

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