Name: Isolation and Preparation of Endosomes Containing Magnetic Nanoparticles from Cultured Cells
Uploaded: 2024-01-26T14:10:00
Description: Watch this Scientific Journal Video about Isolation and Preparation of Endosomes Containing Magnetic Nanoparticles from Cultured Cells at JoVE.com

isolation and preparation of endosomes containing magnetic nanoparticles from cultured cells

Optimalisert magnetisk høyytelsesproduksjon av endosomavledede nanovesikler

Extracellular vesicles (EVs) are small vesicles secreted by almost all cells with a size range of 30-150 nm, containing abundant bioactive substances. Depending on the cell of origin, EVs show high heterogeneity, possessing multiple components specific to parent cells1. EVs are released into body fluids and transported to distant sites where they are taken up by target cells for action2, which can be utilized to deliver a wide range of bioactive molecules and drugs for tissue repairing, tumor diagnosis and treatment, and immune modulation3,4. However, other biological nanoparticles (e.g., lipoproteins) and nanovesicles (e.g., EVs derived from non-endosomal pathways) with similar biophysical properties in body fluids inevitably affect EV isolation and purification. To date, ultracentrifugation remains the gold standard for EV isolation, and other isolation methods, including sucrose density gradient centrifugation, ultrafiltration, polyethylene glycol precipitation, chromatography, and immunomagnetic bead isolation, have been developed5. The current bottleneck limiting clinical translation and commercialization of EV therapeutics is the severe lack of isolation techniques that allow for highly scalable and reproducible isolation of EVs6,7,8. Traditional EV isolation techniques (e.g., ultracentrifugation and size exclusion chromatography) suffer from low yield (1 x 107-1 x 108/1 x 106 cells), long production cycle (24-48 h), poor reproducibility of product quality, and require expensive and energy-intensive production equipment that cannot meet the current clinical demand for EVs6.
Exosome mimics (EMs), synthetic surrogates of native EVs, have attracted important attention due to their highly similar structure, function, and scalability in production. The main source of EMs is from the direct extrusion of whole parental cells with continuous sectioning9,10, demonstrating potent biological functions as native EVs11,12. For instance, EMs derived from human umbilical cord mesenchymal stem cells (hUCMSCs) exert similar wound-healing effects as native EVs and are richer in protein composition13. Though EMs derived from whole cells have the biological complexity of EVs, their main drawback is the heterogeneity of products because they are inevitably contaminated by various cellular organelles and cell debris. Protein localization analysis further revealed that EMs derived from whole-cell extrusion contain many non-EVs-specific proteins from mitochondria and the endoplasmic reticulum13. Moreover, most methods for manufacturing EMs still require ultracentrifugation, a highly time and energy-consuming process14. Considering the fact that exosomes are exclusively derived from cellular endosomes, we hypothesized that bioengineered endosome-derived nanovesicles may better recapitulate the biological homology between exosomes and EMs in comparison with the well-established cell membrane-derived EMs produced by whole cell extrusion method14. Nevertheless, the manufacture of endosome-derived nanovesicles is difficult due to the lack of viable approaches.
Clinical studies have been carried out by utilizing EVs as a surrogate of cell-free therapy and a nanoscale drug delivery system for the treatment of various diseases. For instance, EVs derived from bone marrow mesenchymal stem cells have been used to treat severe pneumonia caused by COVID-19 and have achieved promising results. Recently, genetically engineered EVs carrying CD24 proteins have also demonstrated potent therapeutic benefits for treating COVID-19 patients15,16. However, the clinical requirement of EV therapy still cannot be met with traditional isolation methods because of the low yield and cost. This study reports the large-scale production of endosome-derived nanovesicles via a magnetic separation-assisted high-speed homogenization approach. It takes advantage of the endocytosis pathway of MNPs to isolate MNP-loaded endosomes via magnetic separation, followed by high-speed homogenization to formulate endosomes into monodisperse nanovesicles. Since the types of endosomes collected by this protocol are diverse, further in-depth research is still required to establish good manufacturing practices (GMP) in the industry. This novel EM preparation approach is more time efficient (5 min of high-speed homogenization) to obtain nanovesicles homologous to native EVs. It produces exponentially more vesicles from the same amounts of cells than ultracentrifugation, which can be generally applied to various cell types.

Forfatter Spotlight: Utvikling av en storskala, reproduserbar produksjonsmetode for eksosommimetikk ved bruk av magnetiske nanopartikler 

En magnetisk separasjonsassistert høyhastighets homogeniseringsmetode for storskala produksjon av endosomavledede vesikler

In this study, we try to address a critical unmet need in exosome research, which is developing a large-scale and reproducible production method for exosome mimetics. Due to the notion of native evades, exosome mimetics, EMS, has been produced as surrogates by methods such as real exclusion and ultracentrifugation based filtration. Certainly most exosome mimetics are from the direct exclusion of whole cells, which demonstrates minimal biologic functions, but are inevitable contaminated by cell debris and organelles.Extracellular vesicles have attracted significant attention in biomedical research, especially in disease treatment. However, traditional EV isolation techniques like ultrasensitive filtration, inside exclusion, catamental glyphic start from low-yield poor productibility of plow down quality and require expensive and engineer intensive production equipment that cannot meet the clinical demand for EVs. Our study provided a simple and no cost method for scan up production of exosomes mimetics.We take advantage of unique biological finding that magnetic nanoparticles can be only endonized within cell endosomes, not other organelles. Thus, we can formulate the endosomes into uniform nanosescose. This method effectively improve EME and reduces cost.

Watch this Scientific Journal Video about Isolation and Preparation of Endosomes Containing Magnetic Nanoparticles from Cultured Cells at JoVE.com

Isolation and Preparation of Endosomes Containing Magnetic Nanoparticles from Cultured Cells  

Isolering og fremstilling av endosomer som inneholder magnetiske nanopartikler fra dyrkede celler

For å begynne, kultur cellene i DMEM Complete Medium som inneholder 10% FBS og 5% penicillin-streptomycin i en seks-brønnplate. Inkuber kulturen over en natt ved 37 grader Celsius og 5% karbondioksid. Neste dag, samkultur cellene med 10 nanomolære polylysinmodifiserte jernoksid nanopartikler eller IONP, og inkubere ved 37 grader Celsius og 5% karbondioksid i 12 timer.Etter inkubering, tilsett 0,5 ml trypsin per brønn i tre minutter for å fordøye cellene. Deretter tilsettes en milliliter komplett medium per brønn for å stoppe fordøyelsen. Sentrifuger cellesuspensjonen ved 1 000 g i fem minutter, og kast supernatanten før pelleten suspenderes på nytt i PBS.Deretter suspenderes pelleten i åtte milliliter nytilberedt hypotonisk oppløsning i 15 minutter. Overfør cellesuspensjonen til et glassreagensrør, og bruk 20 støt ved 1.000 RPM ved hjelp av en glasshomogenisator for å frigjøre organellene. Etter homogenisering, overfør en milliliter av cellesuspensjonen til et 1,5 milliliter mikrosentrifugerør.Plasser røret i en magnetisk separator i en time for å skille IONP-belastede endosomer helt fra andre organeller og celleavfall. For å samle endosomer, kast væsken fra røret, og tilsett tre milliliter PBS for å suspendere endosomene igjen. Bruk deretter en pipettepistol til å blåse for å suspendere de brune pelletsene som finnes på kontaktflaten til røret ved siden av magnetrammen.For høyhastighets homogenisering, overfør endosomløsningen til et 15 milliliter sentrifugerør. Plasser isboksen under røret, og legg deretter røret på høyhastighetshomogenisatoren. Plasser sonden på 10 milliliter i røret uten å berøre bunnen.På homogeniseringsskjermen justerer du hastigheten til 140 g, og stiller tiden til fem minutter. Trykk på OK-knappen etterfulgt av Start-knappen. Etter høyhastighets homogenisering, overfør nanovesikelsuspensjonen til et 1,5 milliliter rør, og plasser røret i en magnetisk separator i en time.Til slutt samler du væsken som inneholder de nødvendige eksosommimikkene eller EM-ene uten å forstyrre overflaten ved siden av magnetrammen. Morfologien til BMSC-EMs analysert av NTA og TEM viste en typisk bolleformet vesikkellignende struktur, avgrenset av et lipid-dobbeltlag. Både BMSC-EM og 293T-EM hadde lignende hydrodynamisk diameter som innfødte elbiler.Vestlige blottingresultater viste at BMSC-EM inneholder de samme proteinbiomarkørene som EV, og hadde nesten ingen plasmamembranforurensning. Utbyttet av EMS var betydelig høyere enn innfødte elbiler fremstilt ved ultrasentrifugering. EM-ene hadde en lignende proteinsammensetning som innfødte elbiler.

Research

JoVE Journal

Biology

Isolation and Preparation of Endosomes Containing Magnetic Nanoparticles from Cultured Cells

A Magnetic Separation-Assisted High-Speed Homogenization Method for Large-Scale Production of Endosome-Derived Vesicles

Extracellular vesicles (EVs) have attracted significant attention in physiological and pathological research, disease diagnosis, and treatment; however, ...