• Journal of Plant Biotechnology
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• 제42권4호
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• pp.277-283
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• 2015

Plant genome analyses, including Arabidopsis thaliana showed a large gene family of plant receptor kinases with various extracellular ligand-binding domain. Now intensively studies to understand physiological and cellular functions for higher plant receptor kinases in diverse and complex biological processes including plant growth, development, ligands perception including steroid hormone and plant-microbe interactions. Brassinosteroids (BRs) as a one of well know steroid hormone are plant growth hormones that control biomass accumulation and also tolerance to many biotic and abiotic stress conditions and hence are of relevance to agriculture. BRI1 receptor kinase, which is localized in plasma membrane in the cell sense BRs and it bind to a receptor protein known as BRASSINOSTEROID INSENSITIVE 1 (BRI1). Recently, we reported that BRI1 and its co-receptor, BRI1-ASSOCIATED KINASE (BAK1) autophosphorylated on tyrosine residue (s) in vitro and in vivo and thus are dual-specificity kinases. Other plant receptor kinases are also phosphorylated on tyrosine residue (s). Post-translational modifications (PTMs) can be studied by altering the residue modified by directed mutagenesis to mimic the modified state or to prevent the modification. These approaches are useful to not only characterize the regulatory role of a given modification, but may also provide opportunities for plant improvement.

• 한국식물병리학회지
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• 제14권3호
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• pp.240-246
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• 1998

A cDNA encoding desiccation-related protein was isolated from a flower bud cDNA library of Chinese cabbage (C-DH) and its nucleotide sequence was characterized. It contains 679 bp nucleotides with 501 bp open reading frame. The amino acid sequence of the putative protein showed the highest amino acid sequence homology (79 % identity) to dehydrin protein in Gossypium hirsutum. Also, the C-DH shares 48-52% amino acid sequence identity with the other typical dehydrin proteins in plant cells. When the amino acid sequence of their proteins were aligned, several peptide motifs were well conserved, of which function has to be solved. Particularly the C-DH contains 15 additional amino acids at its N-terminus. Genomic Southern blot analysis using the coding region of C-DH showed that the C-DH consists of a single copy gene in Chinese cabbage genome. The C-DH mRNA, whose transcript size is 0.7 kb, was expressed with a tissue-specific manner. It was highly expressed in seed, flower buds and low expression as detected in root, stem or leaf tissues of Chinese cabbage. And the transcript level of C-DH was significantly induced by the treatment of plant hormone, abscisic acid and water-deficit conditions.

• 생명과학회지
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• 제14권4호
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• pp.573-576
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• 2004

The purpose of the present study is to investigate the lipid peroxidation, creatine kinase activity and cortisol hormone levels following the training intensity in elite judo players. Six elite Judo players participated in the experiments (3h repetition judo program), which include stretching, judo skill practice and cool down without recess. Blood sampling were taken at the judo gymnasium at the time of resting, 1h training, 2h training, 3h training, 2h recovery, and 24h recovery time and this were analyzed for CK, MDA and Cortisol levels. The results obtained were analyzed via repeated measures of ANOVA using SPSS package program (ver.10.0) and a value of p<.05 was considered statistically significant. The results from this study were as follows. In the CK levels, which reflect the contribution of creatine phosphate and muscle damage degree, there was a significant difference (p<.05) after judo training in every period. Recovery 24h showed the highest level. In the MDA levels, which reflect lipid peroxidation, there was a significant difference (p<.05) after judo training. Recovery 2h showed the lowest level. In the cortisol hormone levels, which reflect stress status, there was a significant difference (p<.05). In this study, we can conclude that For the trained athletes, MDA level was lower at the time of exercise compare to the other period, this is caused by the increased antioxidant defence mechanism.

• 대한한방내과학회지
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• 제32권1호
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• pp.100-112
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• 2011

목적 : 본 연구는 결박 스트레스를 시행한 백서의 기억력, 우울, 스트레스 호르몬의 혈중 농도에 대한 전기침의 효과를 관찰하였다. 재료와 방법 : 결박 그룹은 10일 동안 2시간의 결박 스트레스를 받았다. 결박 스트레스 및 고주파수 전침 그룹은 2시간의 결박 스트레스를 받는 동시에 100Hz의 전침을 우측 족삼리 (ST-36)에 시행하였다. 기억력과 우울에 미치는 결박 스트레스와 침의 효과를 비교하기 위하여 억제성 회피 과제와 강제 수영 검사를 실시하였다. 결박 스트레스 및 전기침으로 유도된 코르티코스테론과 멜라토닌, 부신피질자극호르몬, 노르아드레날린의 농도를 측정하기 위하여 결박 스트레스 및 전기침 자극이 시작된 30분, 60분, 90분, 120분 후에 백서의 꼬리에서 혈액 샘플을 채취하였다. 결과 : 억제성 회피 과제에서 전기침을 시행한 그룹은 시행하지 않은 그룹에 대해서 장기 기억의 증진에 유의한 변화가 있었다. 강제 수영 검사 결과에서는 우울에 유의한 변화가 없었으며, 스트레스 호르몬 반응 결과에서도 유의한 변화가 없었다. 결론 : 1. 고주파수 전기침 (100Hz)은 억제성 회피 과제 결과 결박 스트레스에 기억력을 상승시켰다. 2. 고주파수 전기침 (100Hz)은 강제 수영 시험 결과 결박 스트레스로 유도된 우울을 감소시키지 않았다. 3. 고주파수 전기침 (100Hz)은 혈액 채취 결과 스트레스 호르몬을 감소시키지 않았다.

• IMMUNE NETWORK
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• 제16권4호
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• pp.242-248
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• 2016

Thymic atrophy is a complication that results from exposure to many environmental stressors, disease treatments, and microbial challenges. Such acute stress-associated thymic loss can have a dramatic impact on the host's ability to replenish the necessary naïve T cell output to reconstitute the peripheral T cell numbers and repertoire to respond to new antigenic challenges. We have previously reported that treatment with the orexigenic hormone ghrelin results in an increase in the number and proliferation of thymocytes after dexamethasone challenge, suggesting a role for ghrelin in restraint stress-induced thymic involution and cell apoptosis and its potential use as a thymostimulatory agent. In an effort to understand how ghrelin suppresses thymic T cell apoptosis, we have examined the various signaling pathways induced by receptor-specific ghrelin stimulation using a restraint stress mouse model. In this model, stress-induced apoptosis in thymocytes was effectively blocked by ghrelin. Western blot analysis demonstrated that ghrelin prevents the cleavage of pro-apoptotic proteins such as Bim, Caspase-3, and PARP. In addition, ghrelin stimulation activates the Akt and Mitogen-activated protein kinases (MAPK) signaling pathways in a time/dose-dependent manner. Moreover, we also revealed the involvement of the FoxO3a pathway in the phosphorylation of Akt and ERK1/2. Together, these findings suggest that ghrelin inhibits apoptosis by modulating the stress-induced apoptotic signal pathway in the restraint-induced thymic apoptosis.

• Journal of Applied Biological Chemistry
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• 제50권4호
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• pp.227-233
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• 2007

We characterized a full-length cDNA of CaCOP1 from pepper. Phylogenetic analysis based on the deduced amino acid sequence of CaCOP1 cDNA revealed high sequence similarity to the COP1 gene in Oryza sativa (84% identity). CaCOP1 shares high sequence identity with regulatory protein in Arabidopsis (84%), constitutively photomorphogenic 1 protein in Pisum sativum (81%) and COP1 homolog in Lycopersicon esculentum (79%). CaCOP1 gene exists single copy in the chili pepper genome. Expression of CaCOP1 was reduced in response to inoculation of non-host pathogens. The expression of this gene under abiotic and oxidative stresses was investigated, including 200 mM NaCl, 200 mM mannitol, cold ($4^{\circ}C$), 100 ${\mu}M$ abscisic acid (ABA), and 10 mM hydrogen peroxide ($H_2O_2$). CaCOP1 was induced significantly 3 h after low temperature treatment but not by dehydration or high salinity. Moreover, CaCOP1 was not induced by plant hormone ABA. These observations suggest that CaCOP1 gene plays a role in abiotic stress and may be belong to ABA-independent regulation system.

• 생명과학회지
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• 제11권5호
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• pp.415-422
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• 2001

Many secreted proteins have disulfide bonds that are important for their structure and function. Protein disulfide isomerase (PDI, EC 5.3.1.4.), an enzyme that catalyzes the formation and rearrangement of thiol/disulfide exchange reactions, is a resident of the endoplasmic reticulum (ER). The subcellular localization and its function as catalyst of disulfide bond formation in the biosynthesis of secretory and cell membrane proteins suggest that PDI plays a key role in the secretory pathway. We have isolated a cDNA encoding protein disulfide isomerase from Bombyx mori(bPDI). It has been characterized under ER stress conditions (dominantly induced by calcium ionophore A23187, tunicamycin and DTT), which is known to cause an accumulation of unfolded proteins in the ER. Furthermore, It has also been examined for tissue distribution(pronounced at the fat body), hormonal regulation (juvenile hormone, insulin and juvenile +transferrin; however, it is not effected by transferrin alone), and the effect of exogenous bacteria (peak at 16 h after infection) on the bPDI mRNA expression. The results suggest that bPDI is a member of the ER stress protein group, and it may play an important role in exogenous bacterial infection in fat body, and that homones regulate its expression.

• 한국수산과학회지
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• 제54권5호
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• pp.676-684
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• 2021

Euryhaline teleost have extraordinary ability to deal with a wide range of salinity changes. To study the seawater adaptability of rainbow trout Oncorhynchus mykiss (body weight 638±54 g, length 38.6±2 cm) to salinity increase fish were transferred from freshwater to 7, 14, 21, 28 and 32 psu and checked for mortality over 5 days. No mortality was observed in 0-32 psu. In fish transferred to 0-32 psu, blood osmolality was maintained within physiological range. The changes of serum enzyme activities (aspartate transaminase, AST and alanine transaminase, ALT) showed no significant level during experimental period. To explore the underlying molecular physiology of gill and kidney responsible for body fluid regulation, we measured mRNA expression of five genes, Na⁺/K⁺/2Cl^- cotransporter1 (NKCC1), aquaporin3 (AQP3), cystic fibrosis transmembrane conductance regulator (CFTR), glucocorticoid receptor (GR) and growth hormone receptor (GHR) in response to salt stress. Based on our result, rainbow trout could tolerate gradual transfer up to 32 psu for 5 days without mortality under physiological stress. This study suggests to alleviate osmotic stress to fish, a gradually acclimation to increasing salinity is recommended.

• 한국작물학회지
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• 제62권4호
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• pp.325-332
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• 2017

국내에서 논에서 콩 재배시 토양특성과 기후적인 영향으로 인해 발생할 수 있는 침수스트레스를 경감할 수 있는 재배적 방법을 모색하기 위해 연구를 진행했다. 연구결과를 요약하면 아래와 같다. 1. 침수처리 후 경장은 $GA_4$처리에서 제일 컸으며 ABA처리에서는 콩 식물체가 죽는 것으로 조사됐다. 침수처리와 $GA_4$를 제외한 식물생장조절물질(IAA, KT, ETP, SA, MeJA) 처리 사이에는 큰 차이가 없는 것으로 조사됐다. 2. 침수처리 후 엽록소 함량과 Fv/Fm은 IAA, KT, ETP과 같이 식물의 조직과 기관의 발달에 관련된 식물생장조절물질 처리에서 침수처리보다 개선된 결과를 보였다. 이와는 반대로 식물의 스트레스 반응을 조절하는 것으로 알려진 식물생장조절물질 SA와 MeJA처리에서는 침수처리보다 엽록소 함량과 Fv/Fm값이 감소하였다. 3. 위 모든 결과를 종합해 볼 때 콩에서 침수스트레스 저항을 유도에는 식물생장조절물질 KT와 ETP 처리가 효과적이다.

• 대한화장품학회지
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• 제46권1호
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• pp.73-80
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• 2020

심리적 스트레스는 피부의 생리적 상태에 영향을 미치고 다양한 피부 질환을 일으킬 수 있다. 스트레스 호르몬인 코티솔은 섬유질, 케라틴세포, 멜라노사이트와 같은 다양한 피부세포에 의해 분비된다. 밀착연접(tight junction, TJ) 은 포유류 피부의 과립증에서 장벽을 형성하는 세포 접합부위이다. TJ은 다른 피부 장벽기능에도 영향을 미칠 수 있으며 화학, 미생물 또는 면역학적 피부장벽에게 영향을 받는다. 스트레스로 인한 피부 장벽 손상에 관한 보고는 있지만 사람피부에서 코티솔이 TJ을 조절한다는 보고는 없다. 스트레스 호르몬 코티솔이 TJ을 조절하는 기능을 확인하기 위해 각질형성세포에 코티솔을 처리하였다. 코티솔은 TJ 구성 성분의 유전자 발현과 구조를 조절하여 피부 장벽 기능을 손상시켰다. 또한 코티솔은 인공피부 모델에서 과립층 형성을 억제하였다. 이러한 실험결과를 통해 스트레스 호르몬 코티솔이 TJ를 조절함으로써 피부 장벽 기능에 손상을 일으키는 것을 확인할 수 있었다.