• The Korean Journal of Physiology and Pharmacology
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• 제16권6호
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• pp.463-468
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• 2012

Type 1 diabetes (T1D) is caused by dysregulation of the immune system in the pancreatic islets, which eventually leads to insulin-producing pancreatic ${\beta}$-cell death and destabilization of glucose homeostasis. One of the major characteristics of T1D pathogenesis is the production of inflammatory mediators by macrophages that result in destruction or damage of pancreatic ${\beta}$-cells. In this study the inflammatory microenvironment of T1D was simulated with RAW264.7 cells and MIN6 cells, acting as macrophages and pancreatic ${\beta}$-cells respectably. In this setting, peroxiredoxin-1, an anti-oxidant enzyme was knocked down to observe its functions in the pathogenesis of T1D. RAW264.7 cells were primed with lipopolysaccharide and co-cultured with MIN6 cells while PRX-1 was knocked down in one or both cell types. Our results suggest that hindrance of PRX-1 activity or the deficiency of this enzyme in inflammatory conditions negatively affects pancreatic ${\beta}$-cell survival. The observed decrease in viability of MIN6 cells seems to be caused by nitric oxide production. Additionally, it seems that PRX-1 affects previously reported protective activity of IL-6 in pancreatic ${\beta}$ cells as well. These results signify new, undiscovered roles for PRX-1 in inflammatory conditions and may contribute toward our understanding of autoimmunity.

• IMMUNE NETWORK
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• 제9권2호
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• pp.35-40
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• 2009

Although Rap GTPases of the Ras family remained enigmatic for years, extensive studies in this decade have revealed diverse functions of Rap signaling in the control of cell proliferation, differentiation, survival, adhesion, and movement. With the use of gene-engineered mice, we have uncovered essential roles of endogenous Rap signaling in normal lymphocyte development of both T- and B-lineage cells. Deregulation of Rap signaling, on the other hand, results in the development of characteristic leukemia in manners highly dependent on the contexts of cell lineages. These results highlight crucial roles of Rap signaling in the physiology and pathology of lymphocyte development.

• Asian-Australasian Journal of Animal Sciences
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• 제13권7호
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• pp.991-994
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• 2000

Single cell of an indigenous phototrophic bacterium, Rhodovulum sulfidophilum, was incorporated in commercial fish feed for Oreochromis niloticus. The bacterial cell was analyzed for nutritional value and tested for toxicity and acceptability as an aquaculture feed supplement. The results showed higher survival rate and significantly higher growth rate (p<0.001) in O. niloticus fed with the bacteria incorporated fish feed. It is suggested that R sulfidophilum can be utilized as an aquaculture feed supplement.

• 항공우주의학회지
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• 제31권3호
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• pp.84-85
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• 2021

Renal cell carcinoma (RCC) is common primary tumor of kidney. In the past, it had been considered a difficult tumor to manage since the detection was usually delayed until paraneoplastic syndrome and/or distant metastasis appeared due to its slow progression. However, the recent popularization of ultrasound and computed tomography has made RCC one of the easily curable cancers. Eighty percent are found early, mostly with tumor size less than 5 cm. Five-year survival rate after successful nephrectomy is exceeded 80-90 percent. Curative nephrectomy can be tried in stage 1 and 2, and some cases of stage 3. In these cases, return to flight can be considered after 6 to 12 months' observation. It should be monitored any occurrence of cancer recurrence, need for systemic treatment, metastasis, and paraneoplastic syndrome, etc. If any signs of recurrence are found or new treatment needs to be initiated, the flight should be suspended. If there is no recurrence for more than 5 to 10 years, the patient doesn't have to be followed anymore.

• IMMUNE NETWORK
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• 제3권2호
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• pp.150-155
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• 2003

Background: We investigated the effect of donor marrow T cell depletion, administration of FK506, cyclosporin A (CSA), and 3-deazaadenosine (DZA) on graft versus host disease (GVHD) after allogeneic murine hematopoietic stem cell transplantation (HSCT). Methods: We used 4 to 6 week old Balb/c ($H-2^d$, recipient), and C3H/He ($H-2^k$, donor) mice. Total body irradiated recipients received $1{\times}10^7$ bone marrow cells (BM) and $0.5{\times}10^7$ splenocytes of donor under FK506 (36 mg/kg/day), CSA (5 mg/kg/day, 20 mg/kg/day), and DZA (45 mg/kg/day), which were injected intraperitoneally from day 1 to day 14 daily and then three times a week for another 2 weeks. To prevent the GVHD, irradiated Balb/c mice were transplanted with $1{\times}10^7$ rotor-off (R/O) cells of donor BM. The severity of GVHD was assessed daily by clinical scoring method. Results: All experimental groups were well grafted after HSCT. Mice in experimental group showed higher GVHD score and more rapid progression of GVHD than the mice with R/O cells (R/O group) (p<0.01). There were relatively low GVHD scores and slow progressions in FK506 and low dose CSAgroups than high dose CSA group (p<0.01). The survival was better in FK506 group than low dose CSA group. All mice treated with CSA died within 12 days after HSCT. The GVHD score in DZA group was low and slow in comparison with control group (p<0.05), but severity and progression were similar with low dose CSA group (p=0.11). All mice without immunosuppressive treatment died within 8 days, but all survived in R/O group (p<0.01). Survival in low dose CSA group was longer than in control group (p<0.05), but in high dose CSA group, survival was similar to control group. The survival benefit in DZA group was similar with low dose CSA group. FK506 group has the best survival benefit than other groups (p<0.01), comparable with R/O group (p=0.18), although probability of survival was 60%. Conclusion: We developed lethal GVHD model after allogeneic murine HSCT. In this model, immunosuppressive agents showed survival benefits in prevention of GVHD. DZA showed similar survival benefits to low dose CSA. We propose that DZA can be used as a new immunosuppressive agent to prevent GVHD after allogeneic HSCT.

• Journal of Yeungnam Medical Science
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• 제11권1호
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• pp.72-81
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• 1994

1986년 5월 1일부터 1993년 4월 30일까지 비소세포성 폐암으로 확진된 후 수술이 불가능하거나 거부하여 4500cGy에서 6500cGy의 방사선치료를 시행한 55명을 대상으로 임상적 특징, 치료실패양상, 추적조사기간, 예후인자에 따른 생존율의 비교, 치료후 1년 및 2년의 생존율을 후향적으로 조사하여 다음의 결과를 얻었다. 1. 남자가 여자에 비해 17.3배 많았으며 50대와 60대가 가장 많았다. 2. T3가 30명(54.6%)으로 가장 많았으며 T2가 17명(30.9%)이었다. 3. 임파선전이가 없는 경우가 21명(38.2%)이었고 임파선 전이는 N2가 20명(36.4%)으로 가장 많았다. 4. 임상적 병기는 IIIA가 34명(61.8%)으로 가장 많았으며 IIIB는 13명(23.6%)이었다. 5. 병리조직학적 분포에서 편평세포암이 45명(81.8%)으로 가장 많았으며 선암은 5명(9.1%)이었다. 6. 발생부위는 좌상엽이 18명(32.7%)으로 가장 많았으며 우상엽은 13명(23.8%)이었다. 7. 편평세포암 45명중 중등도의 분화를 보인 것은 15명이었으며 분화가 불량한 경우도 10명이었다. 8. 선암 5명중 2명이 여자였으며 3명은 분화가 불량하였다. 9. 원발병소의 크기는 국소관해율에 영향을 주었으며 T4인 경우에는 원격전이에도 다소 영향을 주었다. 10. 지역 임파선의 침범정도는 국소 및 지역임파선재발에 영향을 주었으며 특히 N3인 경우에는 치료후 50%에서 원래병소부위에 재발을 보였다. 11. 국소및 지역임파선재발은 폐종양의 재성장이 가장 많았으며 상대정맥증후군 및 암성 늑막 삼출액, 쇄골상와 임파선 재발의 순이었다. 12. 원격전이는 골전이가 가장 많았으며 다음이 간, 뇌의 순이었다. 13. 편평세포암에서 선암에 비교하여 평균생존기간이 약 3~4개월 길었으며 분화도에 따라 약 3개월정도 생존기간의 차이를 보였다. 14. 발생부위에 따른 생존기간은 중앙부의 기관지에 발생한 경우가 말초부위에 발생한 경우에 비해 2개월정도 길었다. 15. 원발종양의 크기에 따른 생존율은 1년에서 T1, T2가 높았으나 큰 차이가 없었으며 2년에서는 T1, T2가 T3, T4보다 2배이상 높았다. 16. 임파선 전이에 따른 생존율은 1년과 2년에서 NO, N1이 N2, N3에 비해 약 1.5배 높았다. 이상의 결과를 종합하면 원발병소의 크기가 큰 경우, 임파선전이가 있는 경우, 분화도가 낮은 경우, 선암인 경우에는 고선량의 방사선치료와 전신적인 항암제의 투여 및 수술의 병합을 적극적으로 검토할 필요성이 있으며 다분할 조사와 총조사선량의 증대 및 다분야 병합치료를 시도하므로 국소관해율의 증가와 생존율의 향상을 위한 더욱 개선된 폐암치료의 개발에 임상 각 분야 전문가들의 집약된 노력이 요구된다.

• 생약학회지
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• 제22권4호
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• pp.233-239
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• 1991

Phellinus linteus was examined for its anticancer activity using an animal model. Water extract of Phellinus linteus was prepared from artificially cultivated mycelia. Neither toxicity nor abnormal changes of hematological parameters were observed in the rat given orally with high doses of drug extract for 15 days. ICR mice were transplanted with Sarcoma-180 tumor cells intraperitoneally and drug extract was daily given to the mice from 1 day after tumer transplantation for 3 weeks. Administration of drug extract significantly prolonged the survival duration of Sarcoma 180-transplanted mice. For the better understanding of the anticancer activity, we have examined the effect of the drug extract administration on various killer cell functions, such as natural killer(NK) cells, cytotoxic T-lymphocytes (CTL) and macrophages which have been known to be main effector cells in immune responses against tumors. The results from the 4 hr $^{51}Cr-release$ assay have shown that the drug extract augments mouse NK cell activity but neither CTL nor macrophages. It is possible, then, that the anticancer activity of the Phellinus linteus may be associated with augmentation of NK cell function in the cancerated hosts.

• IMMUNE NETWORK
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• 제22권1호
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• pp.9.1-9.23
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• 2022

In the past few decades, biological drugs and small molecule inhibitors targeting inflammatory cytokines, immune cells, and intracellular kinases have become the standard-of-care to treat autoimmune diseases. Inhibition of TNF, IL-6, IL-17, and IL-23 has revolutionized the treatment of autoimmune diseases, such as rheumatoid arthritis, ankylosing spondylitis, and psoriasis. B cell depletion therapy using anti-CD20 mAbs has shown promising results in patients with neuroinflammatory diseases, and inhibition of B cell survival factors is approved for treatment of systemic lupus erythematosus. Targeting co-stimulatory molecules expressed on Ag-presenting cells and T cells is also expected to have therapeutic potential in autoimmune diseases by modulating T cell function. Recently, small molecule kinase inhibitors targeting the JAK family, which is responsible for signal transduction from multiple receptors, have garnered great interest in the field of autoimmune and hematologic diseases. However, there are still unmet medical needs in terms of therapeutic efficacy and safety profiles. Emerging therapies aim to induce immune tolerance without compromising immune function, using advanced molecular engineering techniques.

• Biomolecules & Therapeutics
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• 제30권5호
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• pp.465-472
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• 2022

Melanoma is one of the most aggressive skin cancers. Hypoxia contributes to the aggressiveness of melanoma by promoting cancer growth and metastasis. Upregulation of cyclin D1 can promote uncontrolled cell proliferation in melanoma, whereas stimulation of cytotoxic T cell activity can inhibit it. Epithelial mesenchymal transition (EMT) plays a critical role in melanoma metastasis. Hypoxia-inducible factor-1α (HIF-1α) is a main transcriptional mediator that regulates many genes related to hypoxia. CoCl₂ is one of the most commonly used hypoxia-mimetic chemicals in cell culture. In this study, inhibitory effects of IDF-11774, an inhibitor of HIF-1α, on melanoma growth and metastasis were examined using cultured B16F10 mouse melanoma cells and nude mice transplanted with B16F10 melanoma cells in the presence or absence of CoCl₂-induced hypoxia. IDF-11774 reduced HIF-1α upregulation and cell survival, but increased cytotoxicity of cultured melanoma cells under CoCl₂-induced hypoxia. IDF-11774 also reduced tumor size and local invasion of B16F10 melanoma in nude mice along with HIF-1α downregulation. Expression levels of cyclin D1 in melanoma were increased by CoCl₂ but decreased by IDF-11774. Apoptosis of melanoma cells and infiltration of cytotoxic T cells were increased in melanoma after treatment with IDF-11774. EMT was stimulated by CoCl₂, but restored by IDF11774. Overall, IDF-11774 inhibited the growth and metastasis of B16F10 melanoma via HIF-1α downregulation. The growth of B16F10 melanoma was inhibited by cyclin D1 downregulation and cytotoxic T cell stimulation. Metastasis of B16F10 melanoma was inhibited by EMT suppression.

• 대한두경부종양학회지
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• 제10권2호
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• pp.178-184
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• 1994

저자들은 1985년부터 1992년까지 연세대학교 의과대학 영동세브란스병원에서 치료한 병기 $T_1$성문암 환자 30례를 대상으로 임상적 분석을 시행하여 다음과 같은 결과를 얻었다. 1) 병기 $T_1$성문암의 경우 남여의 비는 29:1로 남자가 대부분이었으며, 60대에 호발하였다. 2) 전례가 편평상피암이었으며 조직학적 분화도가 좋았던 경우가 13례, 중간 분화도이었던 경우가 17례이었다. 3) 초치료로 방사선치료를 한 경우 25.9%에서 재발이 있었으며, 부분후두적출술을 시행한 2례중 1례에서 재발이 있었다. 4) 재발한 경우, 전례에서, 원발부위의 재발이었고 경부재발이 동반된 경우가 1례있었으며, 1년이내 재발이 흔하였다. 5)원발부위 재발의 경우 전연합(anterior commissure)에서 재발이 빈발하였다. 6) 5년 생존율은 81.5%로 이는 병기간, 병리조직학적으로 유의한 차이는 없었다.