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Wang R, Moon SK, Kim WJ, Dhandapani S, Kim H, Kim YJ. Biologically Synthesized Rosa rugosa-Based Gold Nanoparticles Suppress Skin Inflammatory Responses via MAPK and NF-κB Signaling Pathway in TNF-α/IFN-γ-Induced HaCaT Keratinocytes. ACS OMEGA 2022; 7:35951-35960. [PMID: 36249362 PMCID: PMC9558598 DOI: 10.1021/acsomega.2c04832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
Nanotechnology-applied materials and related therapeutics have gained attention for treating inflammatory skin diseases. The beach rose (Rosa rugosa), belonging to the family Rosaceae, is a perennial, deciduous woody shrub endemic to northeastern Asia. In this study, R. rugosa-based gold nanoparticles (RR-AuNPs) were biologically synthesized under optimal conditions to explore their potential as anti-inflammatory agents for treating skin inflammation. The synthesized RR-AuNPs were analyzed using field emission-transmission electron microscopy, energy-dispersive X-ray spectrometry, selected-area electron diffraction, and X-ray diffraction. The uniformly well-structured AuNPs showed near-spherical and polygonal shapes. Cell viability evaluation and optical observation results showed that the RR-AuNPs were absorbed by human keratinocytes without causing cytotoxic effects. The effects of RR-AuNPs on the skin inflammatory response were investigated in human keratinocytes treated with tumor necrosis factor-α/interferon-γ (T + I). The results showed that T + I-stimulated increases in inflammatory mediators, including chemokines, interleukins, and reactive oxygen species, were significantly suppressed by RR-AuNP treatment in a concentration-dependent manner. The western blotting results indicated that the RR-AuNP-mediated anti-inflammatory effects were highly associated with the suppression of inflammatory signaling, mitogen-activated protein kinase, and nuclear factor-κB. These results demonstrate that plant extract-based AuNPs are novel anti-inflammatory candidates for topical application to treat skin inflammation.
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Affiliation(s)
- Rongbo Wang
- Graduate
School of Biotechnology, and College of Life Science, Kyung Hee University, Deogyeong-daero 1732, Giheung-gu, Yongin 17104, Republic of Korea
| | - Sung-Kwon Moon
- Department
of Food and Nutrition, Chung Ang University, Seodong-daero 4726, Daedeok-myeon, Anseong 17546, Republic of Korea
| | - Woo-Jung Kim
- Biocenter, Gyeonggido
Business and Science Accelerator, Gwanggyo-ro 147, Yeongtong-gu, Suwon 16229, Republic
of Korea
| | - Sanjeevram Dhandapani
- Graduate
School of Biotechnology, and College of Life Science, Kyung Hee University, Deogyeong-daero 1732, Giheung-gu, Yongin 17104, Republic of Korea
| | - Hoon Kim
- Department
of Food and Nutrition, Chung Ang University, Seodong-daero 4726, Daedeok-myeon, Anseong 17546, Republic of Korea
| | - Yeon-Ju Kim
- Graduate
School of Biotechnology, and College of Life Science, Kyung Hee University, Deogyeong-daero 1732, Giheung-gu, Yongin 17104, Republic of Korea
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Huber KL, Fernández JR, Webb C, Rouzard K, Healy J, Tamura M, Stock JB, Stock M, Pérez E. AGSE: A Novel Grape Seed Extract Enriched for PP2A Activating Flavonoids That Combats Oxidative Stress and Promotes Skin Health. Molecules 2021; 26:molecules26216351. [PMID: 34770760 PMCID: PMC8587015 DOI: 10.3390/molecules26216351] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/13/2021] [Accepted: 10/16/2021] [Indexed: 12/01/2022] Open
Abstract
Environmental stimuli attack the skin daily resulting in the generation of reactive oxygen species (ROS) and inflammation. One pathway that regulates oxidative stress in skin involves Protein Phosphatase 2A (PP2A), a phosphatase which has been previously linked to Alzheimer’s Disease and aging. Oxidative stress decreases PP2A methylation in normal human dermal fibroblasts (NHDFs). Thus, we hypothesize agents that increase PP2A methylation and activity will promote skin health and combat aging. To discover novel inhibitors of PP2A demethylation activity, we screened a library of 32 natural botanical extracts. We discovered Grape Seed Extract (GSE), which has previously been reported to have several benefits for skin, to be the most potent PP2A demethylating extract. Via several fractionation and extraction steps we developed a novel grape seed extract called Activated Grape Seed Extract (AGSE), which is enriched for PP2A activating flavonoids that increase potency in preventing PP2A demethylation when compared to commercial GSE. We then determined that 1% AGSE and 1% commercial GSE exhibit distinct gene expression profiles when topically applied to a 3D human skin model. To begin to characterize AGSE’s activity, we investigated its antioxidant potential and demonstrate it reduces ROS levels in NHDFs and cell-free assays equal to or better than Vitamin C and E. Moreover, AGSE shows anti-inflammatory properties, dose-dependently inhibiting UVA, UVB and chemical-induced inflammation. These results demonstrate AGSE is a novel, multi-functional extract that modulates methylation levels of PP2A and supports the hypothesis of PP2A as a master regulator for oxidative stress signaling and aging in skin.
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Affiliation(s)
- Kristen L. Huber
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - José R. Fernández
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - Corey Webb
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - Karl Rouzard
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - Jason Healy
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - Masanori Tamura
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - Jeffry B. Stock
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
- Department of Molecular Biology, Princeton University, Princeton, NJ 08852, USA
| | - Maxwell Stock
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
| | - Eduardo Pérez
- Research and Development Department, Signum Biosciences, 11 Deer Park Drive Suite 202, Monmouth Junction, NJ 08852, USA; (K.L.H.); (J.R.F.); (C.W.); (K.R.); (J.H.); (M.T.); (J.B.S.); (M.S.)
- Correspondence: ; Tel.: +1-732-329-6344; Fax: +1-732-329-8344
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Yoon JH, Pham TH, Lee J, Lee J, Ryu HW, Oh SR, Oh JW, Yoon DY. Methyl Linderone Suppresses TPA-Stimulated IL-8 and MMP-9 Expression Via the ERK/STAT3 Pathway in MCF-7 Breast Cancer Cells. J Microbiol Biotechnol 2020; 30:325-332. [PMID: 31893611 PMCID: PMC9728293 DOI: 10.4014/jmb.1911.11068] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Methyl linderone (ML), a cyclo-pentenedione, was isolated from the fruit of Lindera erythrocarpa Makino (family Lauraceae). This plant has well-known anti-inflammatory effects; however, the anti-cancer effects of ML have not yet been reported. Thus, in the present study we investigated the effects of ML on the metastasis of human breast cancer cells. We used 12-O-tetradecanoyl phorbol-13-acetate (TPA)-stimulated MCF-7 cells as the cell model to study the effects of ML on invasion and migration. ML was found to reduce the invasion and migration rate of TPA-stimulated MCF-7 cells. Moreover, it inhibited two metastasis-related factors, matrix metalloproteinase-9 (MMP-9) and interleukin-8 (IL-8), at the mRNA and protein expression levels, in TPA-treated MCF-7 cells. The mechanism by which ML exerted these effects was through the inhibition of translocation of activator protein-1 (AP-1) and signal transducer and activator of transcription-3 (STAT3), mediated via phosphorylation of extracellular signal-regulated kinase (ERK). Taken together, our findings indicated that ML attenuated the TPA-stimulated invasion and migration of MCF-7 cells by suppressing the phosphorylation of ERK and its downstream factors, AP-1 and STAT3. Therefore, ML is a potential agent for the treatment of breast cancer metastasis.
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Affiliation(s)
- Jae-Hwan Yoon
- Department of Bioscience and Biotechnology, Research Institute of Bioactive-Metabolome Network, Konkuk University, Seoul 05029, Republic of Korea
| | - Thu-Huyen Pham
- Department of Bioscience and Biotechnology, Research Institute of Bioactive-Metabolome Network, Konkuk University, Seoul 05029, Republic of Korea
| | - Jintak Lee
- Department of Bioscience and Biotechnology, Research Institute of Bioactive-Metabolome Network, Konkuk University, Seoul 05029, Republic of Korea
| | - Jiyon Lee
- Department of Bioscience and Biotechnology, Research Institute of Bioactive-Metabolome Network, Konkuk University, Seoul 05029, Republic of Korea
| | - Hyung-Won Ryu
- Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju 8116, Republic of Korea
| | - Sei-Ryang Oh
- Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju 8116, Republic of Korea
| | - Jae-Wook Oh
- Department of Stem Cell and Regenerative Biotechnology, Konkuk University, Seoul 05029, Republic of Korea,J.W.O. E-mail:
| | - Do-Young Yoon
- Department of Bioscience and Biotechnology, Research Institute of Bioactive-Metabolome Network, Konkuk University, Seoul 05029, Republic of Korea,Corresponding authors D.Y.Y. Phone: +82-2-450-4119 Fax: +82-2-444-4218 E-mail:
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Yin J, Hwang IH, Lee MW. Anti-acne vulgaris effect including skin barrier improvement and 5α-reductase inhibition by tellimagrandin I from Carpinus tschonoskii. Altern Ther Health Med 2019; 19:323. [PMID: 31752827 PMCID: PMC6869165 DOI: 10.1186/s12906-019-2734-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 10/31/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND Carpinus tschonoskii (CT) has been previously studied for various activities in the improvement of skin diseases. In the present study, we examined the in vitro anti-acne vulgaris (AV) effect of CT leaves (CTL) and tellimagrandin I (TI), one of the main ellagitannins from CT, including skin barrier improvement and 5α-reductase inhibitory activity. METHODS To test the anti-AV activities of CTL and TI, firstly, anti-oxidative and anti-inflammatory activities including DPPH radical scavenging activity, nitric oxide (NO) inhibitory activity, and cytokines [interleukin (IL)-6 and IL-8] were tested. Skin barrier improvement experiments were tested using developing cornified envelope (CE) formation, and filaggrin mRNA expression level was determined by RT-PCR. The 5α-reductase inhibitory activity was determined by measuring the testosterone levels in rat liver microsomes. RESULTS CTL and TI showed potent anti-oxidative activity and anti-inflammatory activities. Especially, the cytokine production inhibitory activities of TI were found to be similar to the positive control, epigallocatechin gallate (EGCG). CTL and TI enhanced the CE formation and filaggrin mRNA expression levels and showed potent activities compared to that in the positive control, 1.5 mM Ca2+. In additionally, CTL and TI showed 5α-reductase inhibitory activities in a dose-dependent manner. CONCLUSION The results showed that CTL and TI inhibit AV endogenous factors such as 5α-reductase and inflammatory cytokines and affect exogenous factors such as developing skin barrier function (CE and filaggrin levels). Therefore, CTL and TI may be plant-derived agent, promising in the treatment of acne vulgaris.
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Yin J, Kim HH, Hwang IH, Kim DH, Lee MW. Anti-Inflammatory Effects of Phenolic Compounds Isolated from Quercus Mongolica Fisch. ex Ledeb. on UVB-Irradiated Human Skin Cells. Molecules 2019; 24:molecules24173094. [PMID: 31454971 PMCID: PMC6749265 DOI: 10.3390/molecules24173094] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 08/23/2019] [Accepted: 08/23/2019] [Indexed: 12/21/2022] Open
Abstract
Quercus mongolica Fisch. ex Ledeb. (QM) has been used as an oriental traditional medicine to relieve hemorrhoids, fever, and enteritis. We screened the inhibitory activities of the extracts and compounds (1–6) isolated from QM on the production of inflammatory cytokines and chemokines to evaluate their anti-inflammatory activities. Further, we evaluated the expression levels of cytokines, chemokines, and immune factors on pedunculagin (PC, 1), which was selected from isolated compounds (1–6) because of its potential anti-inflammation effect. Additionally, we evaluated whether the inflammation mitigation effects of PC (1) following UVB exposure in keratinocytes occurred because of nuclear factor (NF)-κB and signal transducer and activator of transcription (STAT)/Janus kinase (JAK) activation. PC (1) remarkably suppressed interleukin (IL)-6, IL-10, IL-13, and monocyte chemoattractant protein-1 (MCP-1) mRNA expression and reduced the mRNA expression level of Cyclooxygenase-2 (COX-2) and also reduced the phosphorylation of p38 mitogen-activated protein kinases (p38), c-Jun N-terminal kinase (JNK), and extracellular signal-regulated kinase (ERK) in a concentration-dependent manner.
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Affiliation(s)
- Jun Yin
- Department of Pharmacognosy and Natural product-derived Medicine, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea
| | - Han Hyuk Kim
- Department of Pharmacognosy and Natural product-derived Medicine, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea
| | - In Hyeok Hwang
- Department of Pharmacognosy and Natural product-derived Medicine, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea
| | - Dong Hee Kim
- R&D Department Applied Product Development Team, Traditional Korean Medicine Technology Division, 94, Hwarang-ro(Gapje-dong), Gyeongsan-si, Gyeongsangbuk-do 38540, Korea
| | - Min Won Lee
- Department of Pharmacognosy and Natural product-derived Medicine, College of Pharmacy, Chung-Ang University, Seoul 156-756, Korea.
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Kim YA, Kim DH, Park CB, Park TS, Park BJ. Anti-Inflammatory and Skin-Moisturizing Effects of a Flavonoid Glycoside Extracted from the Aquatic Plant Nymphoides indica in Human Keratinocytes. Molecules 2018; 23:molecules23092342. [PMID: 30216992 PMCID: PMC6225133 DOI: 10.3390/molecules23092342] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 09/07/2018] [Accepted: 09/11/2018] [Indexed: 01/12/2023] Open
Abstract
Nymphoides indica, an aquatic plant, is used as folk medicine in some countries. Our previous study demonstrated that the methanol extract of N. indica inhibited the activity of tyrosinases, tyrosine related protein (TRP)1 and TRP2, and microphthalmia-associated transcription factor, as well as the activity of protein kinase A, by effectively inhibiting cyclic adenosine monophosphate. Although the biological activities of N. indica extract have been reported, there are no reports on the skin bioactivity of the main compound(s) on human keratinocytes. This study investigated the anti-inflammatory and moisturizing effects of quercetin 3,7-dimethyl ether 4′-glucoside (QDG) isolated from N. indica. In brief, ultraviolet B irradiated keratinocytes were pretreated with different concentrations of QDG, and the effects of QDG on various inflammatory markers were determined. QDG significantly inhibited inflammation-related cytokines and chemokines and enhanced the activation of skin barrier factors. Additionally, QDG also attenuated phosphorylation inhibition of the upstream cytokines and nuclear factor-κB expression. These results suggest that QDG isolated from N. indica may serve as a potential source of bioactive substances for chronic inflammatory skin diseases.
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Affiliation(s)
- You Ah Kim
- Skin Science Research Institute, Kolmar Korea Co., Ltd., Chungcheongbukdo 28116, Korea.
| | - Dong Hee Kim
- Traditional Korean Medicine Technology Division, National Development Institute of Korean Medicine, Gyeongsangbuk-do 38540, Korea.
| | - Chae Bin Park
- Skin Science Research Institute, Kolmar Korea Co., Ltd., Chungcheongbukdo 28116, Korea.
| | - Tae Soon Park
- Traditional Korean Medicine Technology Division, National Development Institute of Korean Medicine, Gyeongsangbuk-do 38540, Korea.
| | - Byoung Jun Park
- Skin Science Research Institute, Kolmar Korea Co., Ltd., Chungcheongbukdo 28116, Korea.
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Growth Hormone Releasing Peptide-2 Attenuation of Protein Kinase C-Induced Inflammation in Human Ovarian Granulosa Cells. Int J Mol Sci 2016; 17:ijms17081359. [PMID: 27548147 PMCID: PMC5000754 DOI: 10.3390/ijms17081359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 08/15/2016] [Accepted: 08/16/2016] [Indexed: 12/17/2022] Open
Abstract
Cyclooxygenase-2 (COX-2) and interleukin-8 (IL-8) are two important inflammatory mediators in ovulation. Ghrelin may modulate inflammatory signaling via growth hormone secretagogue receptors. We investigated the role of ghrelin in KGN human ovarian granulosa cells using protein kinase C (PKC) activator phorbol 12, 13-didecanoate (PDD) and synthetic ghrelin analog growth hormone releasing peptide-2 (GHRP-2). GHRP-2 attenuated PDD-induced expression of protein and mRNA, the promoter activity of COX-2 and IL-8 genes, and the secretion of prostaglandin E2 (PGE₂) and IL-8. GHRP-2 promoted the degradation of PDD-induced COX-2 and IL-8 proteins with the involvement of proteasomal and lysosomal pathways. PDD-mediated COX-2 production acts via the p38, c-Jun N-terminal kinase (JNK), extracellular signal-regulated kinase (ERK) and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathways; PDD-mediated IL-8 production acts via the p38, JNK and ERK pathways. GHRP-2 reduced the PDD-induced phosphorylation of p38 and JNK and activator protein 1 (AP-1) reporter activation and PDD-induced NF-κB nuclear translocation and reporter activation. The inhibitors of mitogen-activated protein kinase phosphatase-1 (MKP-1) and protein phosphatase 2 (PP2A) reduced the inhibitory effect of GHRP-2 on PDD-induced COX-2 and IL-8 expression. Our findings demonstrate an anti-inflammatory role for ghrelin (GHRP-2) in PKC-mediated inflammation of granulosa cells, at least in part, due to its inhibitory effect on PKC-induced activation of p38, JNK and NF-κB, possibly by targeting to MKP-1 and PP2A.
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Lowrie AG, Salter DM, Ross JA. Latent effects of fibronectin, alpha5beta1 integrin, alphaVbeta5 integrin and the cytoskeleton regulate pancreatic carcinoma cell IL-8 secretion. Br J Cancer 2004; 91:1327-34. [PMID: 15354211 PMCID: PMC2409896 DOI: 10.1038/sj.bjc.6602132] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Interactions between tumour cells and the microenvironment are increasingly recognised to have an influence on cancer progression. In pancreatic carcinoma, a highly desmoplastic stroma with abnormal extracellular matrix (ECM) protein and interleukin-8 (IL-8) expression is seen. To investigate whether the ECM may further contribute to abnormalities in the microenvironment by influencing IL-8 secretion, we cultured the Mia PaCa2 pancreatic carcinoma cell line on fibronectin. This resulted in a dose-dependent increase in IL-8 secretion, which was RGD dependent and accompanied by cell spreading and proliferation. The role of spreading was assessed by disruption of the cytoskeleton with cytochalasin D, resulting in a large increase in IL-8 secretion, which was reduced from 31- to 24-fold by fibronectin. This remarkable response was associated with inhibition of spreading and proliferation and represents a novel cytoskeletal function. To investigate whether it could be accounted for by the loss of integrin-mediated signalling, the expressed α5β1, αVβ5 and α3β1 integrins were inhibited. α5β1 inhibition prevented spreading and proliferation but produced a much smaller rise in IL-8 secretion than cytochalasin D. αVβ5 inhibition alone had only minor effects but when inhibited in combination with α5β1 completely abolished the response to fibronectin. These results reveal latent stimulatory effects of the αVβ5 integrin on IL-8 secretion and suggest that integrin crosstalk may limit the induction of IL-8 secretion by fibronectin. However, the magnitude of IL-8 secretion induced by cytochalasin cannot be accounted for by integrin signalling and may reflect the influence of another signalling pathway or a novel, intrinsic cytoskeletal function.
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Affiliation(s)
- A G Lowrie
- Tissue Injury and Repair Group, 6th Floor, Centre for Inflammation Research, University of Edinburgh Medical School, Teviot Place, Edinburgh EH8 9AG, UK
| | - D M Salter
- Department of Pathology, University of Edinburgh, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH16 4SA, UK
| | - J A Ross
- Tissue Injury and Repair Group, 6th Floor, Centre for Inflammation Research, University of Edinburgh Medical School, Teviot Place, Edinburgh EH8 9AG, UK
- Tissue Injury and Repair Group, 6th Floor, Centre for Inflammation Research, University of Edinburgh Medical School, Teviot Place, Edinburgh EH8 9AG, UK. E-mail:
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