• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제45권5호
• /
• pp.267-275
• /
• 2019

Objectives: Metastasis in oral squamous cell carcinoma (OSCC) can occur in a variety of ways, and draining lymphatics and lymph nodes serve as a common route. Prior to metastasis, lymph nodes elicit an immune response to either wall off or create a favorable environment for homing of tumor cells. This immune response to tumor stimuli is visualized by recognizing various immunoreactive patterns exhibited by the lymph node. The present study aims to evaluate the role of immuno-morphologic patterns of the lymph node in neck dissection for cases of OSCC. Materials and Methods: Our retrospective study included 50 neck dissection cases of OSCC and a total of 1,078 lymph nodes. The grades of primary tumors with eight different immunoreactive patterns were compared. Vascularity and metastasis in lymph nodes were also evaluated. Results: The lymphocyte predominant pattern was the most common immunoreactive pattern found in 396 of 1,078 lymph nodes. Patterns of lymphocyte predominant (P=0.0005), sinus histiocytosis (P=0.0500), paracortical hyperplasia (P=0.0001), cortical hyperplasia (P=0.0001), and increased vascularity (P=0.0190) were significantly associated with tumor grade. Conclusion: The present study adds to the understanding of lymph node immunoreactivity patterns and their correlation with tumor grade. We recommend further study of lymph node patterns for all sentinel lymph node biopsies and routine neck dissections for OSCCs.

• 대한치주과학회:학술대회논문집
• /
• 대한치주과학회 2000년도 제40회 종합학술대회 연제초록
• /
• pp.158-158
• /
• 2000

• 한국영양학회:학술대회논문집
• /
• 한국영양학회 2003년도 연합학술대회
• /
• pp.269.2-269.2
• /
• 2003

• Journal of Microbiology and Biotechnology
• /
• 제25권3호
• /
• pp.393-398
• /
• 2015

Aptamers are composed of single-stranded oilgonucleotides that can selectively bind desired molecules. It has been reported that RNA or DNA could act as not only a genetic messenger but also a catalyst in metabolic pathways. RNA aptamers (average sizes 40-50 bp) are smaller than antibodies and have strong binding capacities to target molecules, similar to antigenantibody interactions. Once an aptamer was selected, it can be readily produced in large quantities at low cost. The objectives of this study are to screen and develop aptamers specific to oral pathogens such as Porphyromonas gingivalis, Treponema denticola, and Streptococcus mutans. The bacterial cell pellet was fixed with formaldehyde as a target molecule for the screening of aptamers. The SELEX method was used for the screening of aptamers and a modified western blot analysis was used to verify their specificities. Through SELEX, 40 kinds of aptamers were selected and the specificity of the aptamers to the bacterial cells was confirmed by modified western blot analysis. Through the SELEX method, 40 aptamers that specifically bind to oral pathogens were screened and isolated. The aptamers showed possibility as effective candidates for the detection agents of oral infections.

• 한국미생물·생명공학회지
• /
• 제48권4호
• /
• pp.574-581
• /
• 2020

Next generation sequencing is commonly used to characterize the microbiome structure. MiSeq is commonly used to analyze the microbiome due to its relatively long read length. However, recently, Illumina introduced the 250x2 chip for HiSeq 2500. The purpose of this study was to compare the performance of MiSeq and HiSeq in the context of oral microbiome samples. The MiSeq Reagent Kit V3 and the HiSeq Rapid SBS Kit V2 were used for MiSeq and HiSeq 2500 analyses, respectively. Total read count, read quality score, relative bacterial abundance, community diversity, and relative abundance correlation were analyzed. HiSeq produced significantly more read sequences and assigned taxa compared to MiSeq. Conversely, community diversity was similar in the context of MiSeq and HiSeq. However, depending on the relative abundance, the correlation between the two platforms differed. The correlation between HiSeq and MiSeq sequencing data for highly abundant taxa (> 2%), low abundant taxa (2-0.2%), and rare taxa (0.2% >) was 0.994, 0.860, and 0.416, respectively. Therefore, HiSeq 2500 may also be compatible for microbiome studies. Importantly, the HiSeq platform may allow a high-resolution massive parallel sequencing for the detection of rare taxa.

• International Journal of Oral Biology
• /
• 제38권4호
• /
• pp.181-188
• /
• 2013

The presence of distinct bacterial species is found to be dependent on age, diet, and disease. We compared the detection rate of several oral bacterial strains in a cohort of 36 subjects including healthy volunteers, periodontal patients, and oral cancer patients. Gargling samples were obtained from these subjects from which DNA was then extracted. Specific primers for 29 bacterial species were used for PCR detection. In the oral cancer patients, Capnocytophaga ochracea, Gemella morbillorum, and Streptococcus salivarius were detected more frequently compared with the healthy volunteers and periodontitis patients. Fusobacterium nucleatum/ polymorphym and Prevotella nigrescens were significantly less prevalent in oral cancer patients than the other groups. In periodontitis patients, Porphyromonas gingivalis and Treponema denticola were more frequently found compared with the healthy volunteers. In the healthy volunteer group, Peptostreptococcus anaerobius was more frequently found than the other groups. The detection rate of several oral bacterial species was thus found to differ between healthy volunteers, periodontitis patients and oral cancer patients.

• 대한병리학회지
• /
• 제52권6호
• /
• pp.411-415
• /
• 2018

Pleomorphic adenoma (PA) is the most common benign salivary gland tumor. Histologically, squamous metaplasia has been reported in PA, but has rarely been documented as being extensive enough to cause significant misdiagnosis. Here, we present an unusual case of PA in a 50-year-old female patient presenting with swelling on the postero-lateral aspect of the palate for a week. Histopathologically, the tumor exhibited the features of conventional PA with extensive squamous metaplasia and giant keratotic lamellae in cyst-like areas. Such exuberant squamous metaplasia and keratin can be a diagnostic and prognostic pitfall and lead to overtreatment of the patient.

• 미생물학회지
• /
• 제53권2호
• /
• pp.129-130
• /
• 2017

Streptococcus gordonii는 그람 양성이면서, 통성 혐기성, 및 비운동성 구균이다. S. gordonii는 사람의 구강 내 정상세균 총의 하나이고, 치면 생체막 형성의 선구적 세균 종이다. S. gordonii는 감염성 심내막염과 패혈성관절염 뿐만 아니라 유치의 치수염에 연관이 있다. S. gordonii KCOM 1506 (= ChDC B679) 균주가 사람 급성치수염 병소에서 분리되었으며 그 유전체 염기서열을 해독하여 보고한다.

• 미생물학회지
• /
• 제53권2호
• /
• pp.123-125
• /
• 2017

Parvimonas micra는 그람 양성이면서, 절대 혐기성, 비포자형성 및 비운동성 구균이다. P. micra는 사람의 구강 내 정상 세균총의 하나이고, 구강, 호흡기 및 위장관계 감염과 연관이 있다. P. micra KCOM 1535 (=ChDC B708) 균주가 사람 치근단 농양 병소에서 분리되었으며 그 유전체 염기서열을 해독하여 보고한다.

• 미생물학회지
• /
• 제55권2호
• /
• pp.149-151
• /
• 2019

Parvimonas micra는 그람 양성, 절대 혐기성, 비운동성 및 아포를 생성하지 않는 구균이다. 이 세균 종은 구강의 정상 세균 총 하나이며, 구강 감염성질환 및 전신질환고도 연관이 있다. P. micra KCOM 1037 (= ChDC B276) 균주가 수술후상악낭종 병소에서 분리되었다. 여기에서 P. micra KCOM 1037 균주의 유전체 염기서열을 완전 해독하여 보고한다.