PURPOSE: Subretinal (SR) injection in porcine models is a promising avenue for preclinical evaluation of cell and gene therapies. Targeting of the subretinal fluid compartment (bleb) is critical to the procedure, especially if treatment of the cone-rich area centralis is required (i.e., visual streak [VS] in pigs). To our knowledge, this study is the first to investigate the influence of injection site placement on VS involvement in the pig eye. METHODS: We performed 23-gauge pars plana vitrectomy followed by SR injection in 41 eyes of 21 animals (Sus scrofa domesticus). In 27 eyes (65.9%), the injection site was placed superior to the VS, and in 14 eyes (34.1%) it was placed inferior to it. Using intraoperative imaging, blebs were classified based on their propagation behavior relative to the VS. RESULTS: In 79% of cases, blebs from inferior injection sites developed away from the VS, exhibiting a mean ± SEM vertical anisotropy (AP) of 0.67 ± 0.11. In contrast, blebs from superior injection sites tended to develop toward the VS with an AP of 1.27 ± 0.18 (P = 0.0070). Blebs developed away from the VS in only 41% of injections (P = 0.0212). Inferior blebs were orientated close to 0° (horizontal), whereas superior blebs displayed varied orientations with a mean angle of 56° (P = 0.0008). CONCLUSIONS: Bleb propagation was anisotropic (i.e., directionally biased) and dependent on injection site placement. Superior injection sites led to superior VS detachment. Morphological analysis suggested increased adhesion forces at the VS and superior vascular arcades. This study will aid the planning of surgeries for targeted subretinal delivery in pig models.
Technologie indukované pluripotence, která umožňuje přípravu prakticky jakéhokoliv buněčného modelu, potřebného pro výzkum vybraného onemocnění, se stává významným nástrojem v boji proti pandemii koronaviru SARS‐CoV-2 a případně i jiným formám pandemií, které se mohou s velkou pravděpodobností objevit v blízké, či vzdálené budoucnosti. Je výhodné, pokud lidstvo v předstihu disponuje arzenálem vhodných modelových systémů, které je možné v případě potřeby nasadit do boje a využít i pro vývoj nových terapeutických a diagnostických strategií. S ohledem na aktuální epidemickou situaci se tak významným způsobem může zkrátit čas, nezbytný pro nalezení vhodného léčebného postupu či zavedení spolehlivého diagnostického setu. Indukované pluripotentní kmenové buňky mají zároveň potenciál použití při regeneraci tkáně, poškozené samotnou infekcí. Jejich značnou výhodou na poli regenerativní medicíny je imunologicky atraktivní možnost využití tělu vlastních, tzv. autologních buněk, bez nutnosti nasazení imunosupresivní terapie po transplantaci.
Technology of induced pluripotency allows the preparation of any cell model for research of any selected disease and becomes the important tool also in the field of SARS‐CoV-2 coronavirus pandemic and other forms of pandemics that can appear in near or far future. It is beneficial for humankind to have an arsenal of useful model systems that can be immediately used in development of novel therapeutic or diagnostic strategies whenever needed. The possible use of newly developed therapy or diagnostic set can be greatly accelerated during pandemic situation. Induced pluripotent stem cells that can be prepared by technology of induced pluripotency also have great potential in tissue regeneration for tissues damaged by coronavirus infection. Immunologically very attractive is the fact that induced pluripotent stem cells can be applied (transplanted) without the use of aggressive immunosuppressive treatment.
- MeSH
- biologické modely MeSH
- COVID-19 terapie MeSH
- indukované pluripotentní kmenové buňky * MeSH
- lidé MeSH
- organoidy MeSH
- techniky in vitro * metody MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
- přehledy MeSH
Here, we present newly derived in vitro model for modeling Duchenne muscular dystrophy. Our new cell line was derived by reprogramming of peripheral blood mononuclear cells (isolated from blood from pediatric patient) with Sendai virus encoding Yamanaka factors. Derived iPS cells are capable to differentiate in vitro into three germ layers as verified by immunocytochemistry. When differentiated in special medium, our iPSc formed spontaneously beating cardiomyocytes. As cardiomyopathy is the main clinical complication in patients with Duchenne muscular dystrophy, the cell line bearing the dystrophin gene mutation might be of interest to the research community.
One of the challenges in clinical translation of cell-replacement therapies is the definition of optimal cell generation and storage/recovery protocols which would permit a rapid preparation of cell-treatment products for patient administration. Besides, the availability of injection devices that are simple to use is critical for potential future dissemination of any spinally targeted cell-replacement therapy into general medical practice. Here, we compared the engraftment properties of established human-induced pluripotent stem cells (hiPSCs)-derived neural precursor cell (NPCs) line once cells were harvested fresh from the cell culture or previously frozen and then grafted into striata or spinal cord of the immunodeficient rat. A newly developed human spinal injection device equipped with a spinal cord pulsation-cancelation magnetic needle was also tested for its safety in an adult immunosuppressed pig. Previously frozen NPCs showed similar post-grafting survival and differentiation profile as was seen for freshly harvested cells. Testing of human injection device showed acceptable safety with no detectable surgical procedure or spinal NPCs injection-related side effects.
- MeSH
- buněčná diferenciace fyziologie MeSH
- dospělí MeSH
- genetické vektory genetika MeSH
- indukované pluripotentní kmenové buňky * fyziologie transplantace MeSH
- krysa rodu rattus MeSH
- lidé MeSH
- mícha MeSH
- mozek MeSH
- nervové kmenové buňky * fyziologie transplantace MeSH
- odběr biologického vzorku metody MeSH
- odběr tkání a orgánů metody MeSH
- prasata MeSH
- přeprogramování buněk * genetika fyziologie MeSH
- přežívání štěpu fyziologie MeSH
- spinální injekce * škodlivé účinky přístrojové vybavení metody MeSH
- transplantace kmenových buněk * škodlivé účinky přístrojové vybavení metody MeSH
- virus Sendai MeSH
- výsledek terapie MeSH
- zvířata MeSH
- Check Tag
- dospělí MeSH
- krysa rodu rattus MeSH
- lidé MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND: Nanofiber wound dressings remain the domain of in vitro studies. The purpose of our study was to verify the benefits of chitosan (CTS) and polylactide (PLA)-based nanofiber wound dressings on a porcine model of a naturally contaminated standardized wound and compare them with the conventional dressings, i.e., gauze and Inadine. MATERIAL AND METHODS: The study group included 32 pigs randomized into four homogeneous groups according to the wound dressing type. Standardized wounds were created on their backs, and wound dressings were regularly changed. We evaluated difficulty of handling individual dressing materials and macroscopic appearance of the wounds. Wound swabs were taken for bacteriological examination. Blood samples were obtained to determine blood count values and serum levels of acute phase proteins (serum amyloid A, C-reactive protein, and haptoglobin). The crucial point of the study was histological analysis. Microscopic evaluation was focused on the defect depth and tissue reactions, including formation of the fibrin exudate with neutrophil granulocytes, the layer of granulation and cellular connective tissue, and the reepithelialization. Statistical analysis was performed by using SPSS software. The analysis was based on the Kruskal-Wallis H test and Mann-Whitney U test followed by Bonferroni correction. Significance was set at P < .05. RESULTS: Macroscopic examination did not show any difference in wound healing among the groups. However, evaluation of histological findings demonstrated that PLA-based nanofiber dressing accelerated the proliferative (P = .025) and reepithelialization (P < .001) healing phases, while chitosan-based nanofiber dressing potentiated and accelerated the inflammatory phase (P = .006). No statistically significant changes were observed in the blood count or acute inflammatory phase proteins during the trial. Different dynamics were noted in serum amyloid A values in the group treated with PLA-based nanofiber dressing (P = .006). CONCLUSION: Based on the microscopic examination, we have documented a positive effect of nanofiber wound dressings on acceleration of individual phases of the healing process. Nanofiber wound dressings have a potential to become in future part of the common wound care practice.
The critical requirements in developing clinical-grade human-induced pluripotent stem cells-derived neural precursors (hiPSCs-NPCs) are defined by expandability, genetic stability, predictable in vivo post-grafting differentiation, and acceptable safety profile. Here, we report on the use of manual-selection protocol for generating expandable and stable human NPCs from induced pluripotent stem cells. The hiPSCs were generated by the reprogramming of peripheral blood mononuclear cells with Sendai-virus (SeV) vector encoding Yamanaka factors. After induction of neural rosettes, morphologically defined NPC colonies were manually harvested, re-plated, and expanded for up to 20 passages. Established NPCs showed normal karyotype, expression of typical NPCs markers at the proliferative stage, and ability to generate functional, calcium oscillating GABAergic or glutamatergic neurons after in vitro differentiation. Grafted NPCs into the striatum or spinal cord of immunodeficient rats showed progressive maturation and expression of early and late human-specific neuronal and glial markers at 2 or 6 months post-grafting. No tumor formation was seen in NPCs-grafted brain or spinal cord samples. These data demonstrate the effective use of in vitro manual-selection protocol to generate safe and expandable NPCs from hiPSCs cells. This protocol has the potential to be used to generate GMP (Good Manufacturing Practice)-grade NPCs from hiPSCs for future clinical use.
- MeSH
- buněčná diferenciace MeSH
- indukované pluripotentní kmenové buňky * MeSH
- krysa rodu rattus MeSH
- leukocyty mononukleární MeSH
- lidé MeSH
- nervové kmenové buňky * MeSH
- neurony metabolismus MeSH
- virus Sendai genetika MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- lidé MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- MeSH
- imunoterapie * MeSH
- lidé MeSH
- nádory ledvin * farmakoterapie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- dopisy MeSH
- práce podpořená grantem MeSH
We present here a new iPS cell line for modeling sporadic form of ALS. Cell line was generated by reprogramming skin fibroblasts isolated with explant culture technology from skin biopsy, donated by ALS patient. For reprogramming, polycistronic self-replicating RNA vector was used and derived iPS cells were characterized by immunocytochemistry and FACS (pluripotent factors expression), karyotyping, STR fingerprinting analysis and in vitro differentiation assay. New cell line showed normal (46, XY) karyotype and differentiated in vitro into cells from three germ layers. STR analysis proved the origin and originality of the cell line.
- MeSH
- amyotrofická laterální skleróza * patologie MeSH
- buněčná diferenciace MeSH
- buněčné linie MeSH
- fibroblasty metabolismus MeSH
- indukované pluripotentní kmenové buňky * metabolismus MeSH
- lidé MeSH
- technologie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Publikační typ
- abstrakt z konference MeSH
Second-order spinal cord excitatory neurons play a key role in spinal processing and transmission of pain signals to the brain. Exogenously induced change in developmentally imprinted excitatory neurotransmitter phenotypes of these neurons to inhibitory has not yet been achieved. Here, we use a subpial dorsal horn-targeted delivery of AAV (adeno-associated virus) vector(s) encoding GABA (gamma-aminobutyric acid) synthesizing-releasing inhibitory machinery in mice with neuropathic pain. Treated animals showed a progressive and complete reversal of neuropathic pain (tactile and brush-evoked pain behavior) that persisted for a minimum of 2.5 months post-treatment. The mechanism of this treatment effect results from the switch of excitatory to preferential inhibitory neurotransmitter phenotype in dorsal horn nociceptive neurons and a resulting increase in inhibitory activity in regional spinal circuitry after peripheral nociceptive stimulation. No detectable side effects (e.g., sedation, motor weakness, loss of normal sensation) were seen between 2 and 13 months post-treatment in naive adult mice, pigs, and non-human primates. The use of this treatment approach may represent a potent and safe treatment modality in patients suffering from spinal cord or peripheral nerve injury-induced neuropathic pain.
- MeSH
- buňky zadních rohů míšních MeSH
- mícha MeSH
- myši MeSH
- neuralgie * etiologie terapie MeSH
- nociceptory * MeSH
- prasata MeSH
- technika přenosu genů MeSH
- zadní rohy míšní MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
