• BMB Reports
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• 제48권2호
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• pp.121-126
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• 2015

Here we report a new chemical inhibitor against HIV-1 with a novel structure and mode of action. The inhibitor, designated as A1836, inhibited HIV-1 replication and virus production with a 50% inhibitory concentration ($IC_{50}$) of $2.0{\mu}M$ in an MT-4 cell-based and cytopathic protection antiviral assay, while its 50% cytotoxic concentration ($CC_{50}$) was much higher than $50{\mu}M$. Examination of the effect of A1836 on in vitro HIV-1 reverse transcriptase (RT) and integrase showed that neither were molecular targets of A1836. The characterization and re-infection assay of the HIV-1 virions generated in the presence of A1836 showed that the synthesis of early RT products in the cells infected with the virions was inhibited dose-dependently, due in part to abnormal protein formation within the virions, thus resulting in an impaired infectivity. These results suggest that A1836 might be a novel candidate for the development of a new type of HIV-1 inhibitor.

• Journal of Pharmaceutical Investigation
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• 제32권2호
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• pp.113-117
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• 2002

Cyto-toxic effect of silver sulfadiazine (Ag-SD) on keratinocytes and its implication on wound healing process were investigated in $2^{nd}$ degree bum hairless mouse model. As a dermal model, HaCat (immortalized keratinocytes) monolayer culture in DMEM with 10% FBS was used. Cyto-toxicity of Ag-SD was estimated by measuring the cell viability using neutral red assay after adding the drug. The $2^{nd}$ degree bum was prepared on hairless mouse back skin (1 cm diameter) and dressings with Ag-SD were applied for 96 hr. The process of re-epithelialization and the presence of inflammatory cells were investigated and histology with Hematoxylin-Eosin staining was performed. Ag-SD displayed highly cyto-toxic effect on cultured HaCat cells in a concentration dependent manner $(1-100\;{\mu}g/mL)$. Topical application of Ag-SD (2%) could control the infection: no inflammatory cells were observed in histology. However the cyto-toxic effect of Ag-SD on skin cells induced the impairment in epidermal regeneration.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제22권2호
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• pp.249-253
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• 2000

Oral and Maxillofacial defects is produced by trauma or cancer surgery. This defects have been shown functional loss such as mastication, swallowing, speech and psychosocial esthetic problem. Oral and Maxillofacial defects is reconstructed by the use of many flaps. However although previous flap surgery was done, additional soft tissue defects can be still remained. In this case, Walk-Up flap that is introduced by Marx RE in 1990 is recommended for successful reconstruction. We report Walk-Up flap for reconstruction of remained soft tissue defects of tongue S.C.C. After induction chemotherapy, tongue S.C.C. is excised surgically and reconstructed by use of PMMC flap. Post-op infection results in surrounding soft tissue defect with oro-facial fistula. We have experienced a case of Walk-up flap by use of PMMC flap for reconstruction with satisfactory result, so we report it with literature reviews.

• Advances in pediatric surgery
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• 제7권1호
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• pp.42-45
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• 2001

The major complications of Meckel's diverticulum (MD) are bleeding, intestinal obstruction, infection, umbilical fistula and perforation. Although the relative incidences vary between authors, bleeding is the most common complication in children. The aim of our study is to show the symptomatic guideline for the diagnosis of the bleeding MD. Eight cases with bleeding MD which were operated upon at the department of Pediatric Surgery, Yeungnam University Hospital from April 1985 to April 2001 were reviewed. Half of the patients were under 2 years of age and all patient s we re male. All patients were preoperatively diagnosed by previous history of intestinal bleeding (melena, hematochezia) and 99mTc pertechnetate MD scan. Segmental resection and end-to-end anastomosis was performed in 6 patients and diverticulectomy in 2 patients. Heterotropic gastric mucosa was found in 6 patients. Postoperative complication was not observed in any cases. In conclusion, in any male children with obscure intestinal bleeding, especially less than 2 years of age, bleeding MD must be suspected. It seems to us that 99mTc pertechnetate MD scan is a useful tool to diagnose bleeding MD.

• Parasites, Hosts and Diseases
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• 제39권4호
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• pp.267-283
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• 2001

In endemic areas of Taenia tapeworms in Korea, most of the reports showed that T. saginata was dominant over T. solium, but eating pigs is the dominant habit over eating cattle. Why do they have more T saginata despite lower consumption of beef This problem actually has long been recognized but until recently there has been no intensive trial to give a scientific explanation on this epidemiological enigma. By summing up the data published between the years 1963 and 1999, the ratio of armed versus unarmed tapeworms in humans was estimated at approximately 1 :5. The ratio of pig-eaters versus cattle-eaters, however, was approximately 5: 1. This inconsistency could be explained with the recently described T. asiatica, which infects humans through the eating of pig's viscera. We re-evaluate the importance of the consumption of visceral organ of pigs, leading us to an improved epidemiological understanding of the T. asiatica infection together with co-existing T. saginata and T. solium in Korea.

• 대한두개안면성형외과학회지
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• 제12권1호
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• pp.37-42
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• 2011

Purpose: Cancer arising from the external auditory canal is a rare disease. A lesion that seems harmless in someway, can be lethal when inadequately excised, the tumor may infiltrate nerves, the parotid and auditory tissues before re-invading the skin. Wide resection of the lesion surrounding the structure and reconstruction with an adequate plan is crucial for the treatment of this disease. Methods: Two patients with external auditory canal cancer were treated with muscle flaps and skin grafts. Lateral temporal bone resection (LTBR) was performed for complete resection of the cancer. The defect cavity was obliterated with highly vascularized tissue using pedicled sternocleidomastoid muscle, and temporalis muscle individually, combined with full thickness skin graft for covering the skin defect of the ear. Results: Clear resection margin was obtained, and both patients showed disease free survival during the follow up. There was no complications of hematoma, infection, flap loss, or wound problem in both patients. Both patient received radiation therapy, there was no osteoradionecrosis or any other complication related to radiation therapy. Conclusion: Utilizing pedicled muscle flaps for managing defects after wide resection of the external auditory canal cancer is an effective method for managing this difficult disease.

• Parasites, Hosts and Diseases
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• 제58권5호
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• pp.527-535
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• 2020

To clarify the reinfection profile associated with risk factors of opisthorchiasis, we conducted an epidemiological study on the chemotherapeutic effects on reinfection with O. viverrini in the endemic areas of Northeastern Thailand for 3 years. A total of 3,674 fecal samples were collected from participants in villages of 5 provinces. They were examined microscopically using a modified technique of formalin ethyl-acetate concentration. Egg-positive residents were reexamined year (2018) by year (2019) after treatment with a single dose (40 mg/kg) of praziquantel. Health education was provided to the participants yearly. The egg-positive rate of O. viverrini was 14.3%, and was highest (22.2%) in the 20-30 year-old group in 2017. The egg positive rate was 15.3% in dogs and 11.4% cats. Human reinfection rate was 15.5% and 6.3% in next 2 years, and was highest (23.2%) among the fishermen. Relative risk factors of reinfection were significantly higher for males, over 40-year-old age, or working as fishermen or farmers, and eating uncooked fish within the preceding year. A significant difference resulting from a health education program was observed in the third year. Therefore, health education and sustainable surveillance for opisthorchiasis should be maintained to decrease the risk of reinfection.

• 한국동물위생학회지
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• 제47권2호
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• pp.89-94
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• 2024

A 5-year-old spayed female mixed-breed dog, previously receiving 7 months of immunosuppressive therapy for pemphigus foliaceus, presented to our referral hospital with a history of dog bites on the right forelimb, chest, and flank 4 days prior to presentation. Physical examination revealed a rectal temperature of 38.6℃; heart rate of 130 beats per minute; panting; systolic blood pressure of 60 mmHg; and swelling, purulent discharge, warmth, pain, and lameness in the right forelimb. The laboratory investigation revealed neutropenia and elevated C-reactive protein levels. Suppurative neutrophilic infiltration with bacterial infection was detected by impression cytology of the pus on the right forelimb. Based on the results of the clinical examinations and laboratory tests, the dog was diagnosed with dog bite-induced sepsis with pemphigus. Meropenem and metronidazole were prescribed. Clinical signs, neutropenia, and C-reactive protein levels markedly improved after 5 days. Subsequently, pemphigus foliaceus relapsed in the dog, and it is currently undergoing re-administration of immunosuppressive medications. To the best of our knowledge, this is the first case report of successful management of dog bite-induced sepsis in a dog undergoing long-term immunosuppressive therapy.

• Journal of Yeungnam Medical Science
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• 제16권2호
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• pp.347-356
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• 1999

복막 투석은 혈액 투석 및 신 이식과 함께 말기 신 질환의 중요한 치료 방법의 하나로 성공적인 복막 투석을 위해서는 복막 투석에 따른 여러 합병증을 줄이는 것이 필수적이다. 그러나 도관 출구 감염이나 복막염 등 투석 관련 감염은 여전히 도관 제거로 인한 복막 투석의 중단을 유발하는 중요한 원인이 되고 있다. 영남대학 의과대학 부속병원에서 1993년 10월부터 1999년 2월까지 복막 투석을 시행 후 추적 가능한 139명의 환자를 대상으로 도관 출구 감염과 복막염의 발생 빈도 및 원인 균주, 도관 제거의 빈도 및 원인 균주, 도관 전환술의 성적, 그리고 mupirocin ointment 사용 전과 사용 후의 도관 출구 감염의 빈도 차이 등을 후향 분석하였다. 복막 투석을 시행한 총 환자-투석기간은 2,401개월이었고 도관 출구 감염은 36명의 환자에서 105례 발생하여 발생 빈도는 1/22.8 환자-개월이었고 복막염은 67명의 환자에서 112례 발생하여 그 빈도는 1/21.4 환자-개윌로 나타났다. 대다수 출구 감염의 경우 일반적인 투약에 잘 반응하였으나 치료에 불응하여 도관 전환술을 시행한 7명 중 5명은 메티실린 저항성 포도상 구균(Methicillin Resistant, Staphylococcus aureus, MRSA), 2명은 Pseudomonas aeruginosa에 의한 감염이었다. revision후 3명에서 감염이 재발하였으나 한 명은 항생제에 바로 치유되었고 또 한 명은 second revision으로 치료하였으며 나머지 한 명은 MRSA에 의한 반복 감염이 지속되어 결국 도관 제거와 동시에 도관 재삽입을 시행하였다. 재발에 대한 치료 후 평균 추적기간 14.0개월 동안 더 이상의 출구 감염은 없었다. 1998년 10월부터 1999년 2월까지 mupirocin을 국소 도포 한 34명의 환자를 살펴보면, pre-mupirocin 기간의 총 투석기간은 687개월이었고 그 기간동안 도관 출구 감염이 54례 발생하여 발생 빈도는 1/12.7 환자-개월로 나타났으나 mupirocin 기간의 경우 총 투석기간 136개월 동안 4례 발생하여 그 빈도가 1/34.0 환자-개월로 유의하게(P<0.01) 감소하였다. 도관 출구 감염의 72.2%가 SA에 의한 것으로 조기에 적절한 항생제 치료를 함으로써 대부분 완치되었고 일부 약제에 잘 반응하지 않고 반복 감염되어 도관 탈락의 위험이 있는 경우에도 도관 전환술을 통하여 비교적 안전하고 효과적으로 난치성 출구 감염을 치유할 수 있었다. 그리고 도관 출구 부위에 mupirocin을 간헐적으로 국소 도포 함으로써 포도상 구균(Staphylococcus aureus)에 의한 출구 감염을 예방할 수 있었다. 그러나 이러한 도관 전환술과 mupirocin의 장기적인 효과 및 부작용에 대해서는 보다 많은 환자군을 대상으로 하는 전향적 연구가 있어야 할 것으로 생각된다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제41권
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• pp.27.1-27.9
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• 2019

Background: Implants are becoming the first choice of rehabilitation for tooth loss. Even though they have a high success rate, failures still occur for many reasons. The objective of this study is to analyze the reasons for recurring failure at the same site and the results of re-implantation. Methods: Thirteen patients (11 males and 2 females, mean age 60 ± 9.9 years) who experienced implant surgery failure at the same site (same tooth extraction area) two or more times in the Department of Oral and Maxillofacial Surgery, Seoul National University Bundang Hospital, between 2004 and 2017 were selected. The medical records on a type, sites, diameter, and length of implants; time and estimated cause of failure; and radiographs were reviewed. Data were collected and analyzed retrospectively, and the current statuses were evaluated. Results: A total of 14 implants experienced failure in the same site more than two times. Twelve implants were placed in the maxilla, while 2 implants were placed in the mandible. The maxillary molar area was the most common site of failure (57.1%), followed by the mandibular molar, anterior maxilla, and premolar areas (14.3% each). The first failure occurred most commonly after prosthetic treatment (35.7%) with an average period of failure of 3.8 months after loading. Ten cases were treated as immediate re-implantation, while the other 4 were delayed reimplantation after an average of 3.9 months. The second failure occurred most commonly after prosthetic treatment (42.9%), with an average of 31 months after loading; during the healing period (42.9%); and during the ongoing prosthetic period (14.3%). In 3 cases (21.4%), the treatment plan was altered to an implant bridge, while the other 11 cases underwent another implant placement procedure (78.6%). Finally, a total of 9 implants (64.3%) survived, with an average functioning period of 60 months. Conclusions: Implants can fail repeatedly at the same site due to overloading, infection, and other unspecified reasons. The age and sex of the patient and the location of implant placement seem to be associated with recurring failure. Type of implant, bone augmentation, and bone materials used are less relevant.