Ameloblastic carcinoma is an ameloblastoma wi th histological malignant transformation with 01' without metastatic di sease_ We report an ameloblastic carcinoma ex ameloblastoma of right mandibular body in 7 -year-old girl with a heterogeneo us hi stologic components_ The tumor s howed so lid s heets composed of atypical kerati nized squamous cells. small ovoid cell s. and s pind le cells in addi tion to a bit of beni gn ameloblastoma component_ Immunohis tochemically, the squ amous cells were strongly cytokemtin posi ti ve/vimentin negati ve and the small ovoid and spindle ce lls were weakJy cytokeratin positi ve/v imentin pos it ive_

Dentin is a mineralized tissue formed by odontoblasts that are differentiated from ectomesenchymal cells , The molecul ar mech anism of odontoblast diffe rentiation remains unclear, Amino acid transporters play an important role in s up plying nutri tion to normal a nd ca ncer cells including odntoblasts, and for cell proliferation , Amino acid transport system L is a maj or nutrient t ransport system responsible for the Na+' -independent transport o[ neutral amino acids incJuding several essentiaJ amino acids , The system L is divided into two major subgroups, the L-type amino acid transporter 1 (LAT1) and the L-type amino acid transporter 2 (LAT2) , In this study, the expression pattern and role of amino acid transport system L were, therefore, investigated in the differentiation of MDPC-23 cells derived from mouse dental papilla celJs , To determi ne the expression Jevel o[ amino acid transport system L participating in intracelJ ular transport of amino acids in the differentiat ion 0 1' MDPC-23 cells, it was examined by RT-PCR, observation of cell morphoJogy‘ A1izaline red-S staining ancl uptake analysis after inclucing experimental differentiation in MDPC-23 cells The res ults were as follows , The LAT1 mRNA was expressed in the early stage of MDPC-23 cell differentiation , The expression leveJ was gradually increased by time course and it was decreased after the late stage, The LAT2 mRNA was not observed in the earJy stage of MDPC-23 cell differentiation, The LAT2 mRNA was expressed at the 11 days 0 1' MDPC-23 cell differentiation and the expression level was gradually decreased by time course, There was no changes in the expression level of 4F2hc mRNA, the cofactor of LAT1 and LAT2, during the differentiation of MDPC-23 cells , The expression of ON mRNA was graduaJJy decreased but the expression of ALP mRNA was increased during differentiation of MDPC-23 cells , The L-Ieucine uptake was increased by time cour se from the early stage to the 9 days in MDPC-23 cell differentiation , The amount of L-Ieucine uptake was maintained to the 11 and 14 days of MDPC-23 cell differentiation As the resul ts‘ it is considered that among neutral amino acid transport system L in differentiation of MDPC-23 cells , the LATl has a key role in cell proliferation in the early stage and middle stage of cell differentiation and the LAT2 has an important roJe in ceJJ differenti ation and mineralization in the Jate stage of cell differentiation for providing cells with neutral a mino acids incJuding several essentiaJ amino acids

Chromosomal abnormality s uch as aneuploidy is one of the main factors to cause cancers This abnormality is caused by defects in centrosomal duplication‘ and most cancer cells have extra copies of centrosomes, r esulting in t he formation of multipolar spindles. Several kinases playing in mitotic phase have been implicated in regulating the centrosomal cycle‘ spindle checkpoint‘ and chromosome co ndensation and segregation. They also have Lhe ability to act as oncogenes. FOl studying the relationship between rnitotic kinase and oral cancers, the kinase activity of polo-like kinase-1, which is one of mitosis-specific kinases, is analyzed in oral carcinoma cells originated differently. Kinase activity was increased in these cancer cells compared to normal human gingival fibroblast primary cultured cells Moreover. the mitotic cell populations were a lso increased in these cell lines. Whereas the inhibition of Polo-like kinase-1 by C-terrninal domain in human gingival fibroblast cells induced multiploidy‘ the apoptotic cell population was increased in oral cancer cells overexpressed C-terminal domain 0 1' Polo- Ii ke kinase-1. These data suggested that polo-like kinase-1 might be involved in the on cogenic effect in oral cancer like other solid human carcinomas, and be target molecules for anti-cancer drug.

PDT is an establi shed cancer treatment modali ty , This can be attributed to the attractive basic concept of PDT; the combina ti on 0[' two ther a peut ic agents, a photosensitizing drug and light, which are r elatively harmless by themselves but combined ultimately ca use more 0 1' less selective tumor destruction, The bacteriochlorophyll - derivatived photosensitizers are known to be s ta ble and hi ghly efficient‘ In this s tudy, we conducted a series of experiments to develope the ligh t induced anticancer drugs against oral cancer cell ‘ We tested the cytotoxicity of the hydroxybact eriochlorine by MTT a ssay and observed the cell death pattern (apoptosis or necrosis) after PDT by hoechst 33342 and propidium iodide s taining methods , IC50 value of the hydroxybacteriochlorine was 31,3ngjm.Q, At higher doses of hydroxybacteriochlorine () 60 ng/ 뼈) ， cancer cells died exc lus ively by nec rosis after PDT By contrast, at IC50 value, h ydroxybacteri ochlorine in duced ca ncel' cell to undergo a poptotic cell death The induction begins approximately 6 hours after PDT We investigates int racellu la r localizati on of hydroxybact eri ochl orine by ora l cancer cell via confocal laser scanning microscopy, Oral can cer cells dual-stained with hydroxybactel' iochlorine and organelle-specific fluoresc ence probes (Mi totracker, Lysotracker , ER- Trac ker) revealed an int l'acellula l' flu orescence distribution restrict ed to cytoplasmic compartments with no detectable fl uoresce nce in the nucleus Confocal images of cells containing hydroxybacteriochlorine were never overlap to mi tochondria, lysosome, endoplasmic l'eticulum when digitally overlapped with the organelle-specific flu orescence probe images of the same cells , These resul ts demonstrat ed that the hydroxybacteriochlorine may have a function as a photosens it izer and cytotoxicity hydroxybactel' ioc hlorine for oral ca ncer cell is more sensitive than head & neck cancer cell or cervical cance l' cell Ther efore PDT using hydroxybact eriochlorine is suitable treatment for oral cavity car cinoma patients.

Indirubin is the active ingredient 0 1' a traditional Chinese herbal medicine, Danggui Longhui Wan, used for the t reatment of chronic myelocytic leu kelma The author reports that novel indirubin derivative, 5'-nitro-indirubinox ime (5'-NIO) , has potent a nti -proliferative activity on human o1'al cancer cells , Treatment of KB cells with 5’ NIO s howed a s t rong cell growth inhibit ion during indicated time point , A typical apoptosis pattern was obtained with DNA fragmenta tion and i mmunofl uorescence analysis of annelxn-v-f!ous Western blot data revealed that p53 and p21CIP1/Waf- l level increased strongJy upon 5'-NIO treatment , The a uthor next tested whether 5'-NIO could activate apoptos is related proteins s uch as caspase-3/-7/-9, [n cells exposed to 5‘-NIO, activation of caspase-3 and -7 was observed, Interesti ngly‘ caspase-9 and cytochrome c cou ld s li ghtly activate in response to 5’-NIO. These results indicate that 5’-NIO strongly induces oral cancer cells apoptosis via a Mi tochondria-mediated cas pase cascade pathway, These observations together s uggest that 5’ NTO may have a possible therapeutic potentia[ to oral cancer

본 연구는 체외 성숙된 난자와 동결 융해 정자를 이용한 돼지의 체외 수정 과정에서 난구 세포의 존재가 정자 침투율, 웅성전핵 형성률 그리고 후기배로의 체외 발육에 미치는 영향을 알아보기 위하여 수행되었다. 돼지 난소로부터 난자-난구세포 복합체를 채취하여 eCG/hCG, 10% 돼지 난포액, epidermal growth factor 등이 첨가된 TCM 199 배양액에서 44시간 배양하여 체외 성숙을 유도하였다. 성숙 배양 후 난구 세포를 제거한 난자와

식용꽃인 꽃베고니아(Begonia semperflorens ‘Superolympia White’), 토레니아(Torenia fournieri ‘Crown Pink’), 팬지(Viola tricolor ‘Solvetsunny Royal’) 및 펠라고니움(Pelargonium grandiflorum ‘Jessie Jarrett’) 추출물의 총페놀 함량, 전자공여능 및 세포독성에 미치 는 영향을 조사하였다. 에탄올 추출물의 총 페놀함량은 펠라고니움의 경우 531.57mg/100g으로 높게 나타났으 나 토레니아는 30.98mg/100g, 팬지는 14.62mg/100g, 꽃베고니아는 5.77mg/100g으로 낮게 나타났다. 전자공 여능은 꽃베고니아, 토레니아, 팬지의 열수 및 에탄올 추출물은 500g·mL-1에서는 모두 69.4% 이하를 나타 냈으나 펠라고니움의 열수 및 에탄올 추출물은 125g·mL-1에서도 각각 94% 내외를 나타내었다. 세포 생존율은 토레니아와 팬지의 열수 및 에탄올 추출물 처리구에서는 95% 이하를 나타내어 세포사가 일어난 것으로 추정되었다. 히스타민 억제효과는 펠라고니움 추출물의 경우 91% 이상을 나타냈으나 토레니아 추출 물은 51-66%, 팬지 추출물은 14-24%, 꽃베고니아 추 출물은 1~2%의 억제 효과만 나타났다.

본 연구는 소 체외수정란과 체세포 복제란의 초자화 동결 및 융해 후 생존능을 검토하였다. 배반포로 발육된 체외수정란 및 체세포 복제란을 초자화 동결법에 의해 동결하였다가 융해하여 생존율 및 배양 후 부화율을 검사하였다. 체외수정란 배반포를 초자화 동결 융해한 결과, 확장배반포가 배반포기 난자에 비하여 생존율(82.1%, 96/117)과 부화율(64.1%, 75/117)에서 모두 유의적으로 높았다(p<0.05). 핵이식 배반포 복제란을 초자화 동결 융해한 경우도 체외수정란과 비슷한 경향을 보여 확장 및 부화배의 생존율과 부화율이 각각 81.1%(30/37)와 78.3%(29/37)로, 배반포(각각 71.8 및 53.8%)에 비하여 다소 높게 나타났다. 본 연구의 결과는 초자화 동결 방법에 의해서 소 체외수정란과 체세포 복제란을 성공적으로 동결할 수 있으며, 특히 후기 배반포기 단계에서 초자화 동결 시 높은 생존율과 부화배 형성율을 얻을 수 있음을 보여준다.

NOD/SCID 마우스는 선천성 면역결핍을 지닌 마우스로서 이종 세포 및 조직 이식을 위한 실험동물로서 가장 많이 활용되고 있다. 본 연구는 돼지의 골수조직에서 채취한 조혈줄기세포를 면역결핍마우스의 정맥 주입을 통하여 생체 내 주입을 실시한 결과, 마우스의 조혈조직에서 대단히 높은 돼지 T 면역세포의 증식이 관찰되었다. 유세포 분석기를 이용해 돼지 골수 조혈세포 생체 이식 6주의 마우스에서의 돼지 T 면역세포의 증식과 분화 특성을 분석한 결과, 마우스 조혈조직인 골수(5.4±1.9%), 비장(15.4±7.3%), 간(21.3±1.4%), 림프절(33.5±32.8%)에서 돼지 조혈줄기세포 유래 T 세포의 증식과 분화가 관찰되었고, 돼지 helper T 세포와 cytotoxic T 세포의 발달도 확인되었다. 또한 조직 면역염색을 통하여 마우스의 비장조직에 이식한 돼지 면역세포의 증식을 관찰하였다. 본 연구는 NOD/SCID 마우스를 이용해 돼지 조혈줄기세포로부터 T 면역세포로의 분화 및 발달과정을 생체 내에서 분석할 수 있는 유용한 동물모델로서 이용할 수 있음을 보여준다.

This is a case reporL of a ra re mi xed odontogenic tumo r, amelob lastic fibro-odontoma in the poste1'ior of r ight ma nd tlbe A 2-year - olcl ma le pa ti enL was referred to our department ['or large tumorous lesion 011 ri ght mandible Radiograph ic examination s howed la rge radi opaque and rad iolu cent lesion with impacted and unerupted tooth, #44‘ #45 , #46 #85 , AJ'Ler s urgi cal enuclea Li on & cu rettage of t he mass , the tumor was confirmed to ameloblastic fibro-odontoma. lt was composed with c1 enta l orga ns a ncl is la nd of odontogeni c epithelium embedded in a cell - ri ch mesenchymal s troma, AIso‘ we ca rri ed out an immunohi stochemical study. The resul ts s howed positive CK7 staining. and showed weekly positi ve for Bcl - 2‘ Ki - 67 s Laining, while CEA, CK8‘ CKl2, CKl6 showed l1egative, Follow-up studies have shown no tumot recurrence for 2 yea rs ,

Previous ly we have s hown that fï brob last• growth factor-2 (FGF-2) and dexamethasone (Dex) in combination strongly stimulate both p l 이 i fe rati o n a nd differe nt iation of mesenchymal stem cells (MSCs) into osteoblasts and adipocytes, In the present s tudy we invesL igaLed whether inhibition 01' FGF-2 and Dex-induced adipogenic differentiation of bone marrow derived s Lem cells (BMSCs) by GW9662, an antagoni s t of proxisome proliferators-activated receptol γ (PPARy) which plays a key role in ad ipogenic differentiation , enhances proliferation and osteoblastic differentiation of BMSCs Proliferation 01' BMSCs t reated wi 네 FGF-2 a nd Dex was further increased by GW9662 up to 9,7, 10,6, and 7,2% at 3, 5, and 7 days of cul Lu re , Expansion of BMSCs with FGF-2, Dex and GW9662 followed by osteoblastic different iation showed that osteoblas tic differentiation 01' BMSCs was in creased by 37 % (p=O, 01) compared to those expanded with FGF-2 and Dex, ln contrast , ad i pogenic di fferenti a tion of FGF-2 and Dex-expanded BMSCs was substantially reduced to 14% (p=O, 036) by GW9662, Taken toget her , these resul ts demonstrate that FGF-2 and Dex in combination with GW9662 f ur t her stimu late proliferation 01' BMSCs and those cells expanded with these factors acquire enhanced potentiaIs to be dif ferentiated i n to osteoblas ts

Matrix metalloproLeases(MMPs) a re a family of zinc dependent enzymes with the capacity to degrade extracellular matrix prote ins. MMPs express ion correlates with cancer cell invasiveness and metas taslS The purpose of our sωdy was t。 determine the role 0 1' stroma l fïbrob lasts in ca ncer cell invasi on by examining the expression and activity of MMP-2 and -9 We used a YD- lOB squalllous ca rcinoma cell line that was est a blished in Yonsei Univer s ity ‘ College 0 1' Dentistry. We then appli ed two types of s lrolllal fibroblastsdel‘ ived from normal gingival tissue and cancer supporting ti ss ue Morphologic examination of fïbroblas ls was carried out by rnicroscopy and doubling time was measured by MTI assay . YD-lOB cells were cultured by lh ree-d imensional culture using collagen gel with two types of flbroblasts To examine the stromal - mesenchyma l inleraclion. we used a direct co-cul tu re system between YD-IOB cells and fibroblasts. Gelatin zymography was performed to exa llline MMP-2 a ncl 9 activit ies. We found that cancer-derived fibroblasts di splay stel late-shaped cells wi th many cyLopl asmic processes. whereas normal gingi val fibroblasts were spindle shaped. The c1oubling time of bOLh lïbroblasLs was not statistically different. Three-dimensional co-culture 0 1' ca ncer cells with ca n cer- c1erived fïbroblasts induced the formation 0 1' multi - Iayered atypical cells, as compared to culturing with normal gin gival f lbrobl asts Both three-c1 imens ional culture ti ss ues inclucecl the invasive gro￦th of cancer cells into the dermal eq uival enLs . Gelatin zymography s howecl that gelatinolytic activity of MMP-2 was activaterl in both co-culture models. However , MMP-9 ac li vity was not a lterecl in YD-lOB carcinoma cells In conclusion. enhanced MMP-2 activity was inc1 uced by boLh cance r- c1eri vecl a ncl norlllal gingival fibroblasts. suggesting that the potential to invacle by stromal fibroblasts was noL l imilecl to ca ncer- c1 eri ved lïbroblasts

Extensive oral mucosa loss from a variety of conditions is associated with significant functional morbidity and mortality. Although it is known that keratinocytes are a rich source of wound healing promoting factors such as transforming growth factor-β1(TGF-β1), it is not clear whether differentiated keratinocytes in a multi-layer form release this multi-functional growth factor. This study examined the hypothesis that keratinocytes in mono- and multi-layer forms expressed different levels of TGF-β1. When NHOK reached confluency in serum free medium(KBM), in test medium containing 1.2 mM Ca++ KBM NHOK were allowed to form multi-layers and differentiate. The purpose of this study were to investigate the mRNA level of TGF-β1, FGF-2, and TIMP-1 by RT-PCR analysis and also to evaluate the expression of TGF-β1 and involucrin in keratinocytes at different times of the onset of differentiation. The numbers and sizes of these nodules were increased as the process of keratinocyte differentiation proceed. Cultured NHOK in preconfluency under KBM medium expressed a significantly higher level of TGF-β1 relative to those grown in multi-layer forms, while the level of TGF-β1 mRNA gradually reduced to its lowest level at 7 days of growing cells in test medium. Cultured NHOK in preconfluency of KBM medium expressed a lower level of FGF-2 and TIMP-1 relative to those grown in multi-layer forms, while the level of FGF-2 and TIMP-1 mRNA showed the highest level at 3 days at gradually reduced to its lowest level at 7 days of growing cells in test medium. As a differentiation marker for keratinocytes at different time points, the highest level of involucrin mRNA expression was found at the later stage of cell differentiation. It suggested that the expression of TGF-β1 mRNA be consistent with the expression of FGF-2 and TIMP-1 mRNA in NHOK grown in high calcium medium during the terminal differentiation. But differentiated NHOK expressing higher involucrin mRNA could show constant espression of TGF-β1, FGF-2 and TIMP-1.

본 연구는 소 난관 상피 세포를 채취 체외 배양을 실시하고, 이에 착상과 관련이 있은 IL-4를 첨가하여 배양액내의 임신에 관련된 호르몬들(P4, E2, TGF-)의 변화를 관찰함으로써, 소 난관 상피 세포와 착상과의 관계를 구명하고자 실시하였으며, 그에 따른 결과는 다음과 같다. 소 난관 상피 세포의 체외 배양시 IL-4 첨가에 의한 배양액내의 P4의 생산은 0.001 ng/ml의 IL-4를 첨가한 배양액의 P4의 농도는 배양 시간이 경과할수록 증가하