A novel biomimetic nanomedicine system with anti-inflammatory and anti-osteoporosis results improves the remedy efficacy of steroid-resistant nephrotic syndrome | Journal of Nanobiotechnology

Supplies

Glycyrrhizic acid (DG0006) was manufactured by Chengdu Desite Organic Know-how Co., Ltd (Chengdu, China). Hydrocortisone (A610506) and calcium chloride (A501330) have been bought from Sangon Biotech Co., Ltd. (Shanghai, China). DMEM (11965092), RPMI 1640 (11875119), fetal bovine serum (10270106), penicillin streptomycin (15140122, 5000 U/ml), and trypsin (25200056) have been bought from Gibco (Thermo Fisher Scientific, USA). Serum-Free Cell Freezing Medium (C40100) was produced by New Cell & Molecular Biotech Co., Ltd. (Suzhou, China). The Calcein/PI Cell Viability/Cytotoxicity Assay Equipment (C2015M) was produced by Beyotime Biotechnology (Shanghai, China). Millex Syringe Filters (400 nm and 200 nm) have been bought from Millipore (USA). The dialysis membrane (MW 1000D, YA1047) and hematoxylin–eosin Contamination Equipment have been bought from SolarBio Science & Know-how Co., Ltd. (Beijing, China). Anti-phosphoolipase A2 (ab239730) and Anti-component 2 (ab231651) monoclonal antibodies have been manufactured by Abcam (USA). FITC-conjugated goat anti-mouse IgG (BA1101) and CY3-conjugated goat anti-rabbit IgG (BA1032) have been obtained from Boster Organic Know-how Co., Ltd. (Wuhan, China).

Preparation of Pm-GCH

Preparation of platelet membrane vesicles (Pm)

As talked about above, contemporary mouse entire blood was positioned in a sodium citrate anticoagulant centrifuge tube and centrifuged at 1000 rpm for 10 min, and the supernatant was collected to acquire platelet-rich plasma. Because of the presence of a certain quantity of RBCs within the obtained platelet-rich plasma, 1% ammonium oxalate was added to lyse RBCs. After centrifugation at 3500 rpm for 15 min, the supernatant was discarded, and platelets have been precipitated. Platelets have been resuspended in regular saline, positioned in a – 80 °C fridge for repeated freeze-thawing to launch the platelets contents, and centrifuged at 5000 rpm for 15 min. The supernatant was discarded, and the membrane precipitate was washed repeatedly with PBS for 3 occasions and resuspended in water. Ultrasound (42 kHz, 100 W) was carried out for 10 min. The particle dimension of Pm was detected by dynamic gentle scattering (DLS).

Building of GCH

Glycyrrhitic acid (0.8 g) and calcium chloride (CaCl₂, 0.1 g) have been dissolved in 10 ml double distilled water, respectively. Glycyrrhitic acid was added dropwise to the CaCl₂ answer and magnetically stirred till the answer turned milky-white to type GC. The answer was then centrifuged and washed with double distilled water 3 occasions, and the powder was lyophilized in a vacuum freeze dryer for later use. The morphological traits of GC have been monitored by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). PBS (2 ml) was used to dissolve GC (4 mg), and anhydrous ethanol (2 ml) was used to dissolve hydrocortisone (1.6 mg). GC and hydrocortisone (H) have been combined dropwise and stirred for twenty-four h, after which added to a dialysis bag to take away the unbound hydrocortisone to acquire GCH. The optical density (OD) of the dialysate at 235 nm was decided. The content material, encapsulation effectivity (EE) and loading effectivity (LE) of hydrocortisone within the dialysate have been calculated in keeping with the next system:

The fusion of GCH and Pm

A continuing quantity (0.5 ml) of Pm (1.25 mg/ml) and GCH suspension (hydrocortisone stage (H), 1 mg/ml) have been combined after which ultrasonicated in a water bathtub (30 min, 42 kHz, 200 W), adopted by extraction via a 200 nm pore needle filter. After centrifugation at 5000 rpm for 15 min, the surplus Pm within the supernatant was discarded, and the precipitate obtained was Pm-GCH.

Characterization of Pm-GCH

Zetasizer Nano (Malvern, UK) was used to detect the hydrodynamic dimension and zeta potential of Pm-GCH. TEM (HT7800, HITACHI, Japan) was used to detect the scale and morphology of Pm-GCH. The UV–Vis absorption of GC (0.25 mg/ml), H (1 mg/ml), Pm (2 mg/ml) and Pm-GCH (1.5 mg/ml) was detected by a UV–Vis spectrometer (2600, Shimadzu, Japan). The platelet membrane protein composition was decided by SDS-PAGE. Then, Comassie Blue staining answer (P1305, SolarBio, China) was used to stain the gel. After decolorization, the gel imaging system was used for evaluation.

Launch traits of glycyrrhizic acid and hydrocortisone in Pm-GCH in vitro

One milliliter of Pm-GCH was added to 3 dialysis luggage and positioned in PBS buffers at pH = 6.5 and pH = 7.4. Dialysate was taken at 2 h, 6 h, 12 h, 24 h, 48 h, and 72 h, and its absorbance at 235 nm (hydrocortisone attribute absorption peak) and 252 nm (glycyrrhizic acid attribute absorption peak) was detected. The absorbances of hydrocortisone and glycyrrhizic acid with completely different focus gradients at 235 nm and 252 nm have been decided, and the usual curves have been established. The hydrocortisone and glycyrrhizic acid contents within the dialysate and drug launch curve have been calculated.

Biocompatibility evaluation in vitro

First, the blood compatibility of Pm-GCH was detected by a hemolysis take a look at. Rabbit pink blood cells (5%) have been incubated with completely different concentrations of GCH and Pm-GCH in a water bathtub at 37 °C for two h. After centrifugation (1500 rpm, 10 min), the supernatant was collected, and its absorbance at 545 nm was measured utilizing a UV–Vis spectrophotometer (Enspire 2300, PerkinElmer, USA). The immune evasive capacity of Pm-GCH was assessed in a murine peritoneal macrophages (MPMs) uptake assay. The MPMs have been incubated with Cy5-labeled GCH and Pm-GCH for 30 min and photographed underneath an inverted laser microscope (Zen2, Zeiss, Germany). Cell lysates have been added to lyse the cells. The lysates have been centrifuged and the supernatant was extracted. The fluorescence depth at 664 nm was detected by a microplate detector (Enspire 2300, PerkinElmer, USA).

Protecting impact of Pm-GCH on adriamycin-injured 293T/D cells in vitro

First, the harm cell mannequin of 293T cells (293T/D) handled with doxorubicin (6 μg/ml) was established. The 293T/D cells have been divided into 4 teams, together with the GC, H, GCH and Pm-GCH teams. 293T/D cells have been handled with GC, H, GCH and Pm-GCH (H focus 10 mg/L) for twenty-four h. A CCK8 cell viability take a look at and marking of useless cells have been carried out. CCK8 experiment: 293T/D cells have been cultured in 96-well plates after which incubated with GC, H, GCH and Pm-GCH (H focus 10 mg/L) for twenty-four h. Ten microliters of CCK answer was added to every effectively for two h. The absorbance at 450 nm was detected by a UV–Vis spectrophotometer. Staining take a look at of dwelling and useless cells: 293T/D cells have been cultured in 6-well plate tradition, and incubated with GC, H, GCH, and Pm-GCH (H focus 10 mg/L) for additional tradition for twenty-four h. In keeping with the directions of Cytotoxicity Assay Equipment (C2015M, Beyotime, China), 0.5 ml staining answer (Calcein-AM 2 μM, PI 4.5 μM) was added to every effectively and incubated at 37 °C for five min. The cells have been noticed and photographed underneath an inverted fluorescence microscope.

Institution of a mouse mannequin of SRNS

Six-week-old feminine C57 mice have been obtained from Hunan SJA Laboratory Animal Co., Ltd. All animal experiment schemes have been accepted by the Animal Use and Care Committee of Central South College. A mice mannequin of SRNS was constructed in keeping with the literature. A single injection of doxorubicin (6.2 mg/kg) was given via the tail vein, and hydrocortisone (25 mg/kg/day, 7 days) was injected into the hip muscle. Twenty-four-hour urine was collected on the seventh, eighth, and ninth days after injection for quantitative detection of urine protein. When the 24 h urine protein amount was ≥ 100 mg/kg and lasted for greater than 3 days, the mannequin was thought of to achieve success.

The distribution of Pm-GCH in vivo

Initially, 100 μl GCH-cy5 and Pm-GCH-cy5 (H, 1 mg/ml) have been injected via the tail vein of SRNS mice. The SRNS mice have been anesthetized at 6, 24, and 48 h after injection and imaged with the In Vivo Imaging System (PerkinElmer, USA). In the meantime, mice have been euthanized at 6, 24 and 48 h after injection. The guts, liver, spleen, lung, kidney and mind have been collected for fluorescence imaging by an In Vivo Imaging System (PerkinElmer, USA).

The protecting impact of Pm-GCH in vivo

Then, 100 μl GC, H, GCH and Pm-GCH (H, 1 mg/ml) have been injected day by day via the tail vein of SRNS mice for 3 consecutive days. Urine was collected for 24-h urinary protein quantitation. The focus of urine protein was detected with a BCA Protein Assay Equipment (P0012S, Beyotime, China). After 12 days, all SRNS mice have been euthanized, and contemporary entire blood was taken for routine blood and kidney perform. Hematological indices (RBCs, Hb, WBCs, PLTs) have been decided by an computerized blood cell analyzer (Mindray, China). The liver perform index (ALT, AST) and renal perform index (CREA, BUN) have been detected by a Leadman Diagnostic Equipment (Leadmanbio, China). Kidney, lung, liver, spleen, coronary heart and femur samples have been fastened with 4% paraformaldehyde and embedded in paraffin. Ultrathin sections have been used for HE and Masson staining with a hematoxylin–eosin staining Equipment (G1120, Solarbio, China) and Masson’s trichrome stain equipment (G1340, Solarbio, China).

Transmission electron microscope imaging

The kidney tissues (< 1 mm³) have been fastened in 2.5% glutaraldehyde at 4 °C in a single day, after which fastened in 1% osmic acid for 1–2 h. The samples have been dehydrated with gradient concentrations of ethanol. Then, kidney samples have been handled with acetone for 20 min and embedded with an Embed 812 Embedding Equipment (GE14120, EMS, USA). The samples have been sliced with an ultra-thin slicer to acquire sections of 70–90 nm. The sections have been stained with uranyl acetate and alkaline lead citrate and noticed utilizing transmission electron microscopy (Hitachi, Japan).

Immunofluorescent staining

Paraffin sections have been dewaxed with xylene and hydrated with completely different gradients of alcohol. Sections have been ready in citrate buffer at 95 °C for antigen restore. Hydrogen peroxide (3%) was added to the sections to take away endogenous peroxidase exercise, and 5% BSA was added to dam the nonspecific binding web site. The sections have been incubated with PLA2 main antibody (1:200) at 37 °C for two h. After washing with PBS, FITC-labeled goat anti-mouse secondary antibody (1:500) was added on the sections at 37 °C for two h. After washing with PBS, the sections have been incubated with C2 main antibody (1:200) and CY3-labeled goat anti-rabbit secondary antibody (1:500) at 37 °C for two h. Lastly, kidney sections have been restained with DAPI and photographed with a fluorescence microscope.

Micro-CT evaluation

After the appliance of Pm-GCH, the femurs of mice have been taken for micro-CT scanning (SkyScan1276, Bruker, Germany). The next parameters have been obtained and analyzed: BV, bone quantity; TV, tissue quantity; BV/TV, relative bone quantity; Tb. Th, trabecular thickness; and Tb. N, trabecular quantity.

Statistical evaluation

SPSS software program 18.0 was used for statistical evaluation. Information have been offered because the imply ± normal deviation. Comparisons between teams have been analyzed with one-way evaluation of variance (ANOVA) and Tukey’s submit take a look at. One asterisk (*) represents p < 0.05, and a double asterisk (**) represents p < 0.01.