• Preventive Nutrition and Food Science
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• 제12권3호
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• pp.141-147
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• 2007

Cordycepin (3'-deoxyadenosine), which comes from Cordyceps militaris, the Chinese medicinal fungal genus Cordyceps, is used in the treatment of various diseases such as cancer and chronic inflammation. We recently reported that cordycepin has a novel antiplatelet effect through the down regulation of $[Ca^{2+}]_{i}$ and the elevation of cGMP/cAMP production. In this study, we further investigated the effect of cordycepin on collagen-induced platelet aggregation in the presence of cGMP-dependent protein kinase (PKG)- or cAMP-dependent protein kinase (PKA)-inhibitor. PKG inhibitor Rp-8-pCPT-cGMPS potentiated the collagen-induced platelet aggregation, but PKA inhibitor Rp-8-Br-cAMPS did not. However, both Rp-8-pCPT-cGMPS and Rp-8-Br-cAMPS reduced inhibition by cordycepin of collagen-induced platelet aggregation. Moreover, cordycepin inhibited $Ca^{2+}-dependent$ phosphorylation of both 47 kDa- and 20 kDa-protein in the presence of both PKG inhibitor and PKA inhibitor. Taken altogether, these results suggest that the inhibitory effect of cordycepin on collagen-induced platelet aggregation is associated with cGMP/PKG- and cAMP/PKA-pathways, and thus cordycepin may be an efficacious intervention against platelet aggregation-mediated thrombotic disease.

• 식물조직배양학회지
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• 제28권3호
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• pp.165-171
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• 2001

Adenosine deaminase 유전자를 연초의 형질전환용 표지유전자로 활용할 때 형질전환체 여부를 매우 빠르고 눈으로 직접 색깔을 확인할 수 있는 새로운 방법이 개발되었다. ADA 효소는 독성인 adenosine 유도체를 비독성인 inosine 유도체와 암모니아로 변환시키는데, 이때 형성된 암모니아를 phenol-nitoprusside와 alkaline-hypochlorite 용액을 이용하여 청색으로 변환시켜 96 well plate상에서 1시간 내에 형질전환체 여부를 쉽게 확인할 수 있게 되었다. ADA효소의 substrate로서 9-D-arabinofuranosyl adenine, cordycepin, 2'-deoxyadenosine, adenosine and xylofuranosyl adenine이 모두 가능하였으며, substrate 용액의 최적조건은 adenosine 10 mM과 pH 7.5이었다. 특히 형질전환체는 ADA효소의 inhibitor인 deoxycoformycin이 함유되어 있는 용액 속에서는 adenosine을 inosine과 암모니아로 변환시키지 못해 색깔의 변화가 없었는데, 이는 형질전환체에서 색깔의 변화는 ADA효소의 작용 때문에 일어나는 것을 의미한다. 따라서 본 연구결과는 ADA 표지유전자가 도입된 형질전환체의 확인에 있어서 GUS gene system과 같이 눈으로 직접 확인할 수 있을 뿐만 아니라 매우 작은 크기의 형질전환체 절편으로 쉽고, 빠르면, 값싸게 확인할 수 있게 되었다.

• Natural Product Sciences
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• 제20권2호
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• pp.86-90
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• 2014

Phytochemical investigation of the 80% MeOH extract from the leaves of Hosta longipes resulted in the isolation of sixteen compounds (1 - 16). The structures of the compounds were elucidated by spectroscopic methods to be methyl 10,10-dimethoxydecanoate (1), methyl 10-hydroxy-8E,12Z-octadecadienoate (2), methyl coriolate (3), trans-phytol (4), phytene-1,2-diol (5), phyton (6), (3S,5R,6S,7E,9R)-7-megastigmene-3,6,9-triol (7), (3S,5R,6S,9R)-3,6,9-trihydroxymegastigman-7-ene (8), shikimic acid (9), p-coumaramide (10), trans-N-p-coumaroyltyramine (11), cis-N-coumaroyltyramine (12), tryptophan (13), thymidine (14), adenosine (15), and deoxyadenosine (16). Compound 1 was synthesized, but not yet isolated from natural source, and compounds 2-16 were isolated for the first time from this plant source.

• Natural Product Sciences
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• 제13권3호
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• pp.229-233
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• 2007

Chemical investigation of the crude extract of the Egyptian marine tunicate Eudistoma laysani led to the isolation of a new nucleoside; 3-deazainosine and four known ones; inosine, 2'-deoxyuridine, adenosine and 2'-deoxyadenosine. Structural elucidation of the isolated compounds was based on intensive studies of their spectral data including 1D ($^{1}H$ and $^{13}C$) and 2D ($^{1}H-^{1}H$ COSY, HMQC, HMBC) NMR together with mass spectra. The antioxidant effects of the isolated compounds were determined using DPPH, where they exhibited significant activities.

• 약학회지
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• 제56권2호
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• pp.71-73
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• 2012

Cordyceps militaris, a caterpillar-grown traditional medicinal mushroom, produces important bioactive compounds, cordycepin (3'-deoxyadenosine) and militarin. Militarin is reported to possess anticancer activities against several tumor cells. An efficient synthetic method of militarin was developed to prepare muti-gram scale sample for bioassay. Militarin was successfully synthesized from commercial starting materials in 5 steps and 29.3% overall yields.

• Journal of Life Science
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• 제9권1호
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• pp.64-68
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• 1999

The properties of purified intracellular adenosine deaminase (adenosine aminohydrolase, EC 3.5.4.4) of Nocardioides sp. J-326TK isolated from soil have been studied. The enzyme deaminated adenosine and 2`-deoxyadenosine and the respective {TEX}$K_{M}${/TEX} values were 4.0×{TEX}$10^{-4}${/TEX} M and 5.0× {TEX}$10^{-4}${/TEX} M, but the enzyme was not active on 8-bromoadenosine, 6-methylaminopurine riboside, ATP, ADP, 2`-AMP, 3`-AMP, 5`-AMP, dAMP, cAMP, NAD, FAD, NADP and adenine. The enzyme activity was strongly inhibited by the addition of {TEX}$Hg^{2+}${/TEX} and {TEX}$Ag^{+}${/TEX}, {TEX}$Cu^{2+}${/TEX}, {TEX}$Co^{2+}${/TEX} and {TEX}$Mn^{2+}${/TEX} also inhibited the activity but much less extent. The effect of alkyl reagents, metal chelating reagents and certain other compounds on the enzyme activity were also examined. No reagent activated the enzyme. On the contrary, the enzyme reaction was slightly inhibited by o-phenanthroline and 6-benzyladenosine.

• 한국미생물·생명공학회지
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• 제24권6호
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• pp.693-698
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• 1996

Optimal cultural conditions were investigated for the maximal productivity of nucleoside oxidase and peroxidase from Flavobacterium meningosepticum. Sucrose and Polypepton were the best as a carbon source and a nitrogen source. Fe$^{2+}$, Fe$^{3+}$ and Cu$^{2+}$ increased the activities of the two enzymes and were essential in medium containing peptone as a nitrogen source. Nucleoside derivatives such as 2'-deoxyguanosine, 2'-deoxyadenosine, N$^{6}$ -methyladenosine and 1-methyladenosine were effective for the production of the two enzymes. Especially, the addition of N$^{6}$ -methyladenosine and 1-methyladenosine decreased cell growth, but increased the two enzyme activities. High level of oxygen also was an essential factor for formation and/or induction of these enzymes. From the summary of this study about optimal medium and environmental conditions, nucleoside oxidase was biosynthesized in proportion to peroxidase. These results suggested that the role of peroxidase should be degradation of H$_{2}$O$_{2}$ generated by nucleoside oxidase in the cell of Flavobacterium meningosepticum.

• Natural Product Sciences
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• 제18권4호
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• pp.233-238
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• 2012

Nine compounds (1 - 9), ${\alpha}$-linolenic acid (1), cis-5,8,11,14,17-elcosapentaenoic acid (2), phytol (3), loliolide (4), uridine (5), thymidine (6), deoxyadenosine (7), adenine (8), and adenosine (9), were isolated from the n-hexane, methylene chloride, ethyl acetate and n-butanol fractions of Capsosiphon fulvescens. The structures of these compounds were elucidated on the basis of spectroscopic evidence. Compounds 1 - 9 exhibited acetylcholinesterase (AChE) inhibitory activities with $IC_{50}$ values ranging from 114.91 to $252.40{\mu}M$, whereas 2 - 4 showed butyrylcholinesterase (BChE) inhibitory activities with $IC_{50}$ values ranging from 251.18 to $499.16{\mu}M$.

• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.52-55
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• 1993

A procedure is described for the synthesis of the title compound via phosphotriester intermediates. The preparation of $R_p\;and\;S_p$ diastereomeric dinucleotide of d[Ap(S)A] was performed by the condensation of protected deoxyadenosine, 2,5-dichlorophenylphosphorodichloridothioate and 1-hydroxybenzotriazole in THF. Their designation of configuration at phosphorus as $R_p\;and\;S_p$ follows from analysis of $^{31}P$-NMR spectroscopy and reversed-phase HPLC and the stereospecificity in the hydrolysis catalyzed by nuclease Pl.

• Journal of Microbiology and Biotechnology
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• 제23권2호
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• pp.156-160
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• 2013

Culture supernatants of splenocytes from C57BL/6 mice were exposed to 0.3, 1.0, and 3.0 ${\mu}g/ml$ cordycepin plus 3.0 ${\mu}g/ml$ lipopolysaccharide (LPS) to investigate the effects of cordycepin (3'-deoxyadenosine) on the production of inflammatory cytokines. Coadministration of 3.0 ${\mu}g/ml$ cordycepin with LPS in cultured murine spleen cells significantly diminished expression of the inflammatory cytokines tumor necrosis factor-${\alpha}$ and interleukin-6 (IL-6) in a time-dependent manner. Expression of the inflammatory cytokine IL-17A was substantially downregulated in a timeand concentration-dependent manner at all cordycepin concentrations. These findings suggest that cordycepin downregulates the immediate hypersensitivity reaction stimulated by LPS.