• The Plant Pathology Journal
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• 제15권2호
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• pp.127-130
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• 1999

Cytological changes of cowpea root at the early stage of root nodule formation (within 5 days after inoculation) were viewed by light and electron microscopy. The root region affected by the rhizobial infection, which was composed of a redial array of cortical cells, had prominent cell divisions, mostly anticlinal in the inner cortical cells and in addition oblique and periclinal in the outer cells. An infected root hair cell (or root hair-producing epidermal cell) had numerous infection threads and degenerated cytoplasm. Module meristem was formed adjacent to the infected root hair cell, and characterized by dense cytoplasm, prominent nucleus, numerous small vacuoles, and increased plastids, containing infection threads as well. Bacterial cells were dividing inside the infection thread, the wall materials of which appeared to be dissolved ad accumulated in small vacuoles. inner cortical cells contiguous to the nodule meristem appeared to be actively dividing and dedifferentiating; however, they were not infected by the rhizobia. These structural characteristics are similar to those in the Bradyrhizobium-soybean association previously reported, and may reflect the similar cytological process in cowpea in the early nodule formation.

• 식물조직배양학회지
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• 제27권3호
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• pp.233-238
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• 2000

야생 흰제비꽃의 엽병 유래 callus를 장기 계대배양하는 과정 중에 발생하는 순화된 friable callus와 분화능이 높은 compact callus를 비교 관찰한 바, friable callus는 연초록색으로 부서지기 쉬운 부드러운 callus이고, compact callus는 진녹색으로 단단한 callus였다. 동결처리 한 시료를 주사전자 현미경에서 동일하게 200배로 관찰하여 보면, friable callus 는 작은 세포집단으로 이루어진 세포군의 주변부에 고도로 액포화된 세포가 광범위하게 분포되어 있는 반면, compact callus는 거의 균일한 세포들로 구성되어 세포구성이 치밀한 것으로 관찰되었다. 또한 friable callus와 compact callus로 부터의 체세포배형성은 배양세포에서 배가 발생하여 배양기간이 지남에 따라 식물체로 분화하였다. 이와 같은 과정은 배양세포의 세포질이 보다 충만한 부위에서 배유사체 (embryo like body)의 발생이 이루어지는 것으로 관찰되었다.

• Journal of Microbiology and Biotechnology
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• 제33권5호
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• pp.582-590
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• 2023

Stress granules (SGs) are cytoplasmic aggregates of RNA-protein complexes that form in response to various cellular stresses and are known to restrict viral access to host translational machinery. However, the underlying molecular mechanisms of SGs during viral infections require further exploration. In this study, we evaluated the effect of SG formation on cellular responses to coxsackievirus B3 (CVB3) infection. Sodium arsenite (AS)-mediated SG formation suppressed cell death induced by tumor necrosis factor-alpha (TNF-a)/cycloheximide (CHX) treatment in HeLa cells, during which G3BP1, an essential SG component, contributed to the modulation of apoptosis pathways. SG formation in response to AS treatment blocked CVB3-mediated cell death, possibly via the reduction of mitochondrial reactive oxygen species. Furthermore, we examined whether AS treatment would affect small extracellular vesicle (sEV) formation and secretion during CVB3 infection and modulate human monocytic cell (THP-1) response. CVB3-enriched sEVs isolated from HeLa cells were able to infect and replicate THP-1 cells without causing cytotoxicity. Interestingly, sEVs from AS-treated HeLa cells inhibited CVB3 replication in THP-1 cells. These findings suggest that SG formation during CVB3 infection modulates cellular response by inhibiting the release of CVB3-enriched sEVs.

• Animal cells and systems
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• 제2권3호
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• pp.395-401
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• 1998

The regional distribution and relative frequency of endocrine cells were studied immunohistochemically in the gastrointestinal tract (GIT) of the Manchurian chipmunk, Tamias sibiricus asiaticus. Six kinds of endocrine cells were identified in this study. 5-hydroxytryptamine (5-HT)-immunoreactive cells were detected throughout the GIT. These cells were observed in moderate numbers in the pylorus, duodenum, jejunum, ileum, fundus, colon, and rectum. Somatostatin- and bovine pancreatic polypeptide (BPP)-immunoreactive cells were also identified throughout the GIT. The former were abundant in the pylorus region while the latter were scattered In ileum and colon. Motilin-immunoreactive cells were rarely detected in the small intestine. A few neurotensin-immunoreactive cells were detected in jejunum, ileum and colon. Also, a few substance P-immunoreactive cells were observed to be restricted to duodenum and jejunum.

• 대한수의학회지
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• 제38권1호
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• pp.1-8
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• 1998

The relative frequency and distribution of bovine chromogranin(BCG)-, serotonin-, somatostatin(SOM)- and S-100 protein-immunoreactive cells in the intestinal tract of the duck (Anas platyrhynchos platyrhyncos, Linne) with ages were studied using immunohistochemical methods. BCG-immunoreactive cells were detected in duodenum on 23 days of incubation. Thereafter these cells were occurred throughout the intestine. SOM-immunoreactive cells were detected in the small intestine from hatching to 9 weeks. Thereafter they were also observed in colon. Serotonin-immunoreactive cells were detected throughout the intestinal tracts after hatching. These immunoreactive cells were increased with ages except that BCG-immunoreactive cells were decreased with ages from 6 weeks after hatching. BCG- and serotonin-immunoreactive cells were most frequently detected in colon regions and SOM-immunoreactive cells in duodenum regions, but no S-100 protein-immunoreactive cells were detected in this study.

• 대한수의학회지
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• 제38권2호
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• pp.386-393
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• 1998

The study was performed to investigate the histological findings and the appearances of positive cells by immunohistochemical methods using proliferating cell nuclear antigen (PCNA) antibody and apoptotic kit in diethylnitrosamine (DEN) -induced rat liver cancer model. Forty four male rats (Sprague Dawley), initially 5 to 6 weeks of age and 120 to 150gm in body weight were continuously were given with water containing 0.01% DEN for 13 weeks and 3~6 rats per week were randomly sacrified at intervals of a week from 8 weeks to 17 weeks. The interlobular connective tissues in the rat livers were proliferated at early 8 weeks. The vaccuolated or fatty degenerated liver cells were focally distributed and then widely distributed with the passage of weeks and the liver cells with large vacuoles tended to be crowded in focal areas, and the liver cells in some lobules were transformed into small or eosinophilic polyhedral large cells. The hepatocellular carcinoma and the cholangiocarcinoma were simultaneously developed in same liver and tended to be markedly developed after 12 weeks but the development of carcinoma in some livers at same week were less or more advanced as 3~5 week intervals. The regions with more number of positive cells by PCNA antibody or apoptotic kits in livers were ranked as following order ; small hepatocellular carcinoma regions, cholangiocarcinoma regions, trabecular or acinar type carcinoma regions, and large liver cell regions. The numbers of the positive cells by PCNA antibody were more numerous than those by apoptotic kit. So these findings suggested that the volumes and weights of the livers were increasing by more many proliferating of carcinoma cells on the above ordered regions.

• 한국콘텐츠학회논문지
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• 제10권7호
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• pp.297-304
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• 2010

소장 흡수상피 세포는 점액 다당류가 풍부하고 림프구와 사립체가 많아 방사선에너지에 민감하다. 따라서 세포 손상은 영양분 결핍 및 전해질 대사의 불균형을 가져와 장관사의 주 원인이 된다. 본 연구는 소장 흡수상피 세포들의 방사선 손상기전과 방어기작을 밝히고자 프로폴리스를 복강에 투여한 후 초 미세구조를 관찰하였다. 관찰 결과, 5Gy 조사 후 20일된 조직에서 소장이 유착되고, 표면이 검게 변해 있었으며 탄력성이 줄어든 것을 볼 수 있었다. 광학현미경(LM) 관찰 결과, 배상세포의 크기 및 수가 줄어들었으며 파네트과립세포는 위축되고 일부에서는 공포가 관찰되었다. 전자현미경(TEM) 관찰 결과, 미세융모와 용해소체는 정상적으로 관찰되었으나 사립체 막이 손상되고 림프구 가장자리에서 요철면이 형성되었다. 회장에서는 흡수상피조직이 비후되고 공포가 관찰되었다. 하지만 프로폴리스 복강 투여 후 관찰에서는 사립체의 이중막이 정상적으로 관찰되었고, 미세융모의 당질층도 손상되지 않았으며, M세포도 많이 관찰되어 자기소화와 흡수 기능이 원활하였다. 따라서 세균 바이러스 등의 면역기능과 세포 손상에 방어효과를 확인하였다.

• 한국미생물·생명공학회지
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• 제45권1호
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• pp.19-26
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• 2017

레스베라트롤의 면역제어 성질과 대식세포의 생존능력과 관련하여 당화된 레스베라트롤의 효과를 확인하기 위해 대식세포 RAW 264.7에서 연구하였다. 인비토로에서 대식세포에서 총 4개의 레스베라트롤 및 당화된 유도체 (E)-resveratrol, (E)-resveratrol 3-O-${\beta}$-${\small{D}}$-glucoside (R-3-G), 및 (E)-resveratrol 4'-O-${\beta}$-${\small{D}}$-glucoside (R-4'-G)를 여러 가지 농도로 처리한 후 일산화질소 (NO)와 인터루킨 6 (IL-6) 발현을 연구하였다. 앞서 언급한 물질로 처리한 후 인비토로에서 RAW 264.7 세포의 생존능력도 연구하였다. 대식세포 생존능력 평가분석 결과를 보면, 두 개의 레스베라트롤 모노글루코사이드인 R-3-G와 R-4'-G은 (E)-resveratrol와 비교하여 A549 and HepG2 세포에서 50-80% 감소된 독성을 보여준다. 당이 없는 레스베라트롤과 비교하면, 당화된 레스베라트 유도체는 긍정적으로 전사적으로 IL-6 및 iNOS 발현이 높아지는 방향으로 NO 및 대식세포에서 IL-6의 생산이 조절된다. 레스베라트롤의 당의 역할은 RAW 264.7 세포의 생존능력과 레스베라트롤의 면역제어 활성을 증가시켜 주는 것으로 보여주고 있다.

• Journal of Nutrition and Health
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• 제36권1호
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• pp.24-31
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• 2003

The present study was attempted to investigate the antioxidant capacity of popular yellow-green vegetable juices (kale, Angelica keishei, carrot, small water dropwort) and to investigate the effect of vegetable juices on protecting oxidative damage to DNA in cultured Chinese hamster lung (CHL) cells. Antioxidant capacity was analyzed by TRAP assay (Total radical-trapping antioxidant potential). Cellular DNA dmamage was measured by SCGE (single-cell gel electrophoresis, also known as comet assay. Cells incubated in medium with PBS (negative control) or with various concentration of the freeze dried green juices (25, 50, 100, 250 $\mu\textrm{g}$/$m\ell$) resuspended in PBS were treated with $H_2O_2$ (200 ${\mu}{\textrm}{m}$) as an oxidative stimulus for 5 min at 4$^{\circ}C$. The physiological function of each vegetable juice on oxidative DNA damage was analyzed and expressed as tail moment (tail length X percentage migrated DNA in tail) . Kale juice had the highest TRAP value suggesting that kale has the highest antioxidant capacity followed by Angelica keishei, small water dropwort and carrot. Cells treated with $H_2O_2$ had extensive DNA damage compared with cells treated with PBS or pre-treated with vegetable juice extracts. All green juices inhibited $H_2O_2$-induced DNA damage with kale being the most effective juice among the tested juices. These results indicate that green juice supplementation to CHL cells followed by oxidative stimulus inhibited damage to cellular DNA, supporting a protective effect against oxidative damage induced by reactive oxygen species. (Korean J Nutrition 36(1) : 24-31, 2003)

• 대한약침학회지
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• 제16권1호
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• pp.43-49
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• 2013

Objective: Pyungwi-san (PWS) plays a role in a number of physiologic and pharmacologic functions in many organs. Interstitial cells of Cajal (ICCs) are pacemaker cells that generate slow waves in the gastrointestinal (GI) tract. We aimed to investigate the beneficial effects of PWS in mouse small-intestinal ICCs. Methods: Enzymatic digestion was used to dissociate ICCs from the small intestine of a mouse. The whole-cell patch-clamp configuration was used to record membrane potentials from the cultured ICCs. Results: ICCs generated pacemaker potentials in the GI tract. PWS produced membrane depolarization in the current clamp mode. Pretreatment with a $Ca^{2+}$-free solution and a thapsigargin, a $Ca^{2+}$-ATPase, inhibitor in the endoplasmic reticulum, eliminated the generation of pacemaker potentials. However, only when the thapsigargin was applied in a bath solution, the membrane depolarization was not produced by PWS. Furthermore, the membrane depolarizations due to PWS were inhibited not by U-73122, an active phospholipase C inhibitor, but by chelerythrine and calphostin C, protein kinase C inhibitors. Conclusions: These results suggest that PWS might affect GI motility by modulating the pacemaker activity in the ICCs.