Relation between Mössbauer spectroscopy and geometrical frustration factors in MCr1.9857Fe0.02O4 (M = Co, Zn)

Choi, Kang Ryong; Kouh, Taejoon; Kim, Sam Jin; Kim, Chul Sung

doi:10.1002/pssb.200777210

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Similar to the results of this study, activation of ERK was found to be required for the induction of HO-1 in several cells treated with diallyl sulfide, arsenite and brazilin. [26][27][28] In our previous study, we have demonstrated that HO-1 induction via ERK pathways appear to play key roles in the cyto-protection of HT22 cells. 18) This may be due to the diverse, assortment and intensity of the complex signaling pathways activated by different inducers in diverse cell types.…”

Section: Discussionmentioning

confidence: 97%

Sauchinone Suppresses Pro-inflammatory Mediators by Inducing Heme Oxygenase-1 in RAW264.7 Macrophages

Lee

Choi

et al. 2011

Biological & Pharmaceutical Bulletin

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Heme oxygenase-1 (HO-1) is a rate-limiting enzyme in heme catabolism responsible for catalyzing the split of free heme into carbon monoxide (CO), free iron and biliverdin/bilirubin. 1) Recent studies have shown that HO-1 has proven involvment in the resolution of inflammatory responses.2) HO-1 and its enzymatic by-products are the critical regulators of inflammation predominantly targeted against macrophages.3) Studies have shown that the anti-inflammatory action of HO-1 is mediated by inhibition of the production of pro-inflammatory cytokines and chemokines such as tumor necrosis factor-a (TNF-a), interleukin-1b (IL-1b) and interleukin (IL)-6 in activated macrophages. 4,5) Studies indicate that HO-1 and its product carbon monoxide (CO) can suppress the expression of the pro-inflammatory cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS), thereby reducing COX-2-drived prostaglandin E 2 (PGE 2 ) and iNOS-derived nitric oxide (NO) production.6,7) Mitogen-activated protein kinases (MAPKs) is one of the most common signaling pathways that serve to coordinate the cellular response to a variety of extracellular stimuli. MAPKs have an important role in cellular processes, such as proliferation, stress responses, apoptosis and immune defense.8) The MAPK activation also modulates several gene and protein expression including the activation of HO-1. 9,10) Saururus chinensis (LOUR.) BAILL. (Saururaceae) has been traditionally used for the treatment of various diseases such as beriberi, pneumonia, urinary disorders, jaundice and gonorrhea. In Korea this plant is a known folk medicine, used for the treatment of edema.11) Sauchinone, a biologically active lignan isolated from the roots of S. chinensis, exibits various pharmacological activities, including hepatoprotective, antiinflammatory, cytoprotective and immunosuppressive effects.12-16) Moreover, several published studies demonstrate the inhibitory effect of sauchinone on LPS-induced expression of iNOS, iNOS-derived nitric oxide, TNF-a and COX-2 in murine macrophages.12,17) As a part of our ongoing research to identify phytochemicals isolated from natural sources that can induce HO-1 in vitro, 18,19) sauchinone was shown significantly induce the levels of HO-1 in RAW264.7 macrophages. In this study, we demonstrate that the effects of sauchinone on lipopolyscharride (LPS)-induced PGE 2 , NO, TNF-a and IL-1b production were partially reversed by the HO-1 inhibitor tin protoporphyrin. We further provided evidence to support the role of HO-1 in mediation of the antiinflammatory effects of sauchinone. Further this study provided evidence that HO-1 is a critical mechanism by which sauchinone exerts anti-inflammatory effects. Korea. Received April 7, 2011; accepted July 8, 2011; published online July 14, 2011 Sauchinone, a biologically active lignan isolated from the roots of Saururus chinensis (LOUR.) BAILL. (Saururaceae), is reported to exert a variety of biological activities, such as hepatoprotective, anti-inflammatory actions and inhibitory effects on...

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Section: Discussionmentioning

confidence: 97%

Sauchinone Suppresses Pro-inflammatory Mediators by Inducing Heme Oxygenase-1 in RAW264.7 Macrophages

Lee

Choi

et al. 2011

Biological & Pharmaceutical Bulletin

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“…2A). The isomer shift (d = 0.35 mm s À1 ), and the quadrupole splitting (D = 0.70 mm s À1 ) are characteristic of high spin Fe(III) in a distorted octahedral geometry [41].…”

Section: Mössbauer and Electron Paramagnetic Resonance Spectroscopiesmentioning

confidence: 99%

Synthesis, physicochemical characterization, DFT calculation and biological activities of Fe(III) and Co(II)–omeprazole complexes. Potential application in the Helicobacter pylori eradication

Russo

Hissi

Rizzi

et al. 2014

Journal of Molecular Structure

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“…Among the works on the cation substitution of the CoCr 2 O 4 system 17–20, there are few reports concerning the magnetic properties when the Cr 3+ ions are substituted by Fe 18. Considering that Fe 3+ ions have a stronger spin moment than Cr 3+ , introducing of Fe 3+ on B sites may cause the enhancement of magnetization and affect the multiferroic properties in CoCr 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Compensation effect and magnetostriction in CoCr_2−xFe_xO₄

Zhang¹,

Wang²,

Liu³

et al. 2012

Physica Status Solidi (b)

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The magnetic compensation and magnetostriction properties in Fe-doped CoCr 2 O 4 samples have been investigated. Structural and magnetic measurements imply that the doped Fe 3þ ions initially occupy the B1 (Cr) sites when x < 0.1, and then mainly take the A (Co) sites. This behaviour results in a role conversion of magnetic contributors and a composition compensation between two competitively magnetic sublattices at x ¼ 0.1. Temperature-dependent compensation has also been found in the samples with x ¼ 0.1-0.22, with the compensation temperature in the range of 40 -104 K. The Fe 3þ doping also modulates the exchange interaction of the system and prevents the formation of long-range conical order of spins. The magnetoelectric transition temperature at 23 K in CoCr 2 O 4 is shifted to lower temperature by increasing the dopants. The magnetostriction effect in this system has been observed for the first time. The strain has a maximum value of about 280 ppm at x ¼ 0.4. The magnetostriction is consistent with the behaviour of the two magnetic compensations.

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Relation between Mössbauer spectroscopy and geometrical frustration factors in MCr_1.98⁵⁷Fe_0.02O₄ (M = Co, Zn)

Cited by 4 publications

References 11 publications

Sauchinone Suppresses Pro-inflammatory Mediators by Inducing Heme Oxygenase-1 in RAW264.7 Macrophages

Sauchinone Suppresses Pro-inflammatory Mediators by Inducing Heme Oxygenase-1 in RAW264.7 Macrophages

Synthesis, physicochemical characterization, DFT calculation and biological activities of Fe(III) and Co(II)–omeprazole complexes. Potential application in the Helicobacter pylori eradication

Compensation effect and magnetostriction in CoCr_2−xFe_xO₄

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Relation between Mössbauer spectroscopy and geometrical frustration factors in MCr1.9857Fe0.02O4 (M = Co, Zn)

Cited by 4 publications

References 11 publications

Sauchinone Suppresses Pro-inflammatory Mediators by Inducing Heme Oxygenase-1 in RAW264.7 Macrophages

Sauchinone Suppresses Pro-inflammatory Mediators by Inducing Heme Oxygenase-1 in RAW264.7 Macrophages

Synthesis, physicochemical characterization, DFT calculation and biological activities of Fe(III) and Co(II)–omeprazole complexes. Potential application in the Helicobacter pylori eradication

Compensation effect and magnetostriction in CoCr2−xFexO4

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Relation between Mössbauer spectroscopy and geometrical frustration factors in MCr_1.98⁵⁷Fe_0.02O₄ (M = Co, Zn)

Compensation effect and magnetostriction in CoCr_2−xFe_xO₄