Yongsu Choi

Abstract Mitochondria are essential organelles involved in the maintenance of cell growth and function, and have been investigated as therapeutic targets in various diseases. Recent studies have demonstrated that direct mitochondrial transfer can restore cellular functions of cells with inherited or acquired mitochondrial dysfunction. However, previous mitochondrial transfer methods are inefficient and time-consuming. Here, we developed a simple and easy mitochondrial transfer protocol using cen

Tendinopathy is a common musculoskeletal condition causing pain and dysfunction. Conventional treatment and surgical procedures for tendinopathy are insufficient; accordingly, recent research has focused on tendon-healing regenerative approaches. Tendon injuries usually occur in the hypoxic critical zone, characterized by increased oxidative stress and mitochondrial dysfunction; thus, exogenous intact mitochondria may be therapeutic. We aimed to assess whether mitochondrial transplantation could

OBJECTIVES: Although the standard video-assisted thoracoscopic surgery (VATS) approach is generally performed through two to four incisions, uniportal VATS pulmonary resection has recently been reported to be a promising, less invasive alternative. To evaluate the adequacy of uniportal VATS lobectomy as an alternative to conventional VATS lobectomy in lung cancer, we analysed and compared the outcomes of uniportal and conventional VATS lobectomies. METHODS: Retrospective observational data for p

Hypocotyl segments of Eleutherococcus senticosus cultured on Murashige and Skoog's (MS) medium with 4.5 μ m 2,4-D produced somatic embryos directly from the surface of explants without intervening callus formation. When these somatic embryos were subcultured to the same MS medium with 4.5 μ m 2,4-D, friable embryogenic calli were formed mainly from radicle tips of somatic embryos, but at a low frequency (5%). Selected embryogenic calli were maintained on MS agar or liquid medium with 4.5 μ m 2,4

Strategies designed to produce functional cells from stem cells or from mature cells hold great promise for treatment of different cell-degenerative diseases. Type 1 and type 2 diabetes are examples of such diseases. Although different in origin, both involve inadequate cell mass of insulin-producing beta cells, the most abundant cell type of pancreatic islets of Langerhans. Practical realization of such strategies is highly dependent on the elucidation of physiological mechanisms responsible fo

Immature dendritic cells (imDCs) are increasingly viewed as mediators of T-cell tolerance. We investigated factors enabling induction of regulatory T (Treg) cells through syngeneic imDC/mesenchymal stem cell (MSC) co-cultures in vitro and immunosuppressive effects of MSC-mediated imDCs (MSCs were excluded after 72 h co-culture) in vivo. In these experiments, we found that Foxp3(+) Treg cell population remarkably increased after the T cell priming phase when splenocytes were co-cultured with both

In this study, we developed a composite filler comprising cross-linked hyaluronic acid (HA) and human collagen (COL) derived from the human umbilical cord with the aim of improving its biocompatibility and longevity compared with commercially available fillers. After HA/ COL composite fillers were made in two different ratios (10:1 and 5:1), the physical properties of the fillers were evaluated. The interior morphologies and in vivo weight change of these hydrogels were also characterized at 1-1

BACKGROUND: Sepsis has a high mortality rate, but no specific drug has been proven effective, prompting the development of new drugs. Immunologically, sepsis can involve hyperinflammation, immune paralysis, or both, which might pose challenges during drug development. Recently, mitochondrial transplantation has emerged as a treatment modality for various diseases involving mitochondrial dysfunction, but it has never been tested for sepsis. METHODS: We isolated mitochondria from L6 muscle cells a