in-vitro-time-lapse-live-cell-imaging-to-explore-cell-migration

In vitro Time-lapse Live-Cell Imaging to Explore Cell Migration toward the Organ of Corti

To study the effects of mesenchymal stem cells (MSCs) on cell regeneration and treatment, this method tracks MSC migration and morphological changes after ...

Yonsei University Wonju College of Medicine

Hallym University College of Medicine

Extranodal natural killer/T-cell lymphoma of the tenosynovium of the hand.

Providencia species frequently colonize urinary catheters and cause urinary tract infections (UTIs); however, bacteremia is uncommon and not well understood. We investigated the clinical features of Providencia bacteremia and the antibiotic susceptibility of Providencia species.

Clinical and microbiological features of Providencia bacteremia: experience at a tertiary care hospital.

Rheumatoid arthritis (RA) is frequently associated with various extra-joint complications. Although rare, thromboembolic complications are associated with high morbidity and mortality. We experienced a very rare case of nonbacterial thrombotic endocarditis (NBTE) and subsequent embolic stroke in a patient with RA. A 72-year-old male with a 15-year history of RA suddenly developed neurologic symptoms of vomiting and dizziness. Brain magnetic resonance imaging revealed recently developed multiple cerebellar and cerebral lacunar infarctions. Echocardiography showed a pulsating mitral valve vegetation involving the posterior cusp of the mitral valve leaflet, which was confirmed as NBTE. Immediate anti-coagulation therapy was started. The NBTE lesion disappeared in follow-up echocardiography after 4 weeks of anti-coagulation treatment. 

Non-Bacterial Thrombotic Endocarditis in a Patient with Rheumatoid Arthritis.

The technology of directing nanoparticles to specific locations in the body continues to be an area of great interest in a myriad of research fields. In the present study, we have developed nanoparticles and a method that allows the nanoparticles to move to specific sites by simultaneously utilizing the homing ability and magnetism of stem cells. Polymeric clustered SPIO (PCS) nanoparticles are composed of a superparamagnetic iron oxide nanoparticle (SPION) cluster core coated with poly lactic-co-glycolic acid (PLGA) and labeled with the fluorescent dye Cy5.5 for tracking. PCS is designed to be internalized by stem cells via endocytosis and then moved to the desired subcellular location through magnetism. Here, we investigated the interactions between SPIONs and mesenchymal stem cells (MSCs), including their absorption mechanism and subcellular localization. Exposure to the nanoparticles at 40 μg/mL for over 96 h did not affect cell survival or differentiation. We used a variety of endocytosis inhibitors and identified the potential cellular internalization pathway of SPIONs to be clathrin-mediated endocytosis. Antibodies to organelles were used to accumulate lysosomes through early and late endosomes. PCS at 40 μg/mL was internalized and stored without significant deleterious effects on stem cells, indicating that MSCs can act as an effective nanoparticle carrier. These findings also demonstrate the successful localization of the novel particles using magnetic attraction.

Endocytic trafficking of polymeric clustered superparamagnetic iron oxide nanoparticles in mesenchymal stem cells.

Early detection of inner ear cell damage can reduce the chances of permanent damage to hearing ability. However, current inner ear cell damage detection methods can detect damage only after the patient has lost hearing ability. MicroRNA expression levels in circulating systems are affected in diseases or conditions arising from the distant lesions. Therefore, detection of circulating microRNA expression levels could be one of the best ways to obtain information on inaccessible lesion sites.

Circulating microRNAs as potentially new diagnostic biomarkers of idiopathic sudden sensorineural hearing loss.

Age-related hearing loss (ARHL) is the most common sensory disorder among the elderly, associated with aging and auditory hair cell death due to oxidative-stress-induced mitochondrial dysfunction. Although transgenic mice and long-term aging induction cultures have been used to study ARHL, there are currently no ARHL animal models that can be stimulated by intermittent environmental changes. In this study, an ARHL animal model was established by inducing continuous oxidative stress to promote short-term aging of cells, determined on the basis of expression of hearing-loss-induced phenotypes and aging-related factors. The incidence of hearing loss was significantly higher in dual- and triple-exposure conditions than in intermittent hypoxic conditions, high-fat diet (HFD), or d-galactose injection alone. Continuous oxidative stress and HFD accelerated cellular aging. An increase in  usually expressed during mitochondrial dysfunction, was observed. Expression of , , , , and , which are ARHL-related factors, were modified by oxidative stress in the cells of the hearing organ. We found that intermittent hypoxia, HFD, and galactose injection accelerated cellular aging in the short term. Thus, we anticipate that the development of this hearing loss animal model, which reflects the effects of intermittent environmental changes, will benefit future research on ARHL.

Jeong-Eun Park

Department of Otorhinolaryngology,
Research Institute of Hearing Enhancement

Yonsei University Wonju College of Medicine

In vitro Time-lapse Live-Cell Imaging to Explore Cell Migration toward the Organ of Corti

Jeong-Eun Park

Department of Otorhinolaryngology,Research Institute of Hearing Enhancement

Yonsei University Wonju College of Medicine

In vitro Time-lapse Live-Cell Imaging to Explore Cell Migration toward the Organ of Corti

Department of Otorhinolaryngology,
Research Institute of Hearing Enhancement