1
|
Karrasch T, Höpfinger A, Schäffler A, Schmid A. The adipokine C1q/TNF-related protein-3 (CTRP-3) inhibits Toll-like receptor (TLR)-induced expression of Cathelicidin antimicrobial peptide (CAMP) in adipocytes. Cytokine 2021; 148:155663. [PMID: 34388476 DOI: 10.1016/j.cyto.2021.155663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/23/2021] [Accepted: 07/26/2021] [Indexed: 01/22/2023]
Abstract
BACKGROUND AND AIM CAMP (Cathelicidin antimicrobial peptide) expression in adipocytes is regulated by Toll-like receptor (TLR) agonists. Secreted adipokines such as CTRP-3 have been suggested to participate in innate immune signaling in adipose tissue (AT). This study investigates whether TLR-induced CAMP expression in adipocytes is antagonized by CTRP-3. METHODS 3T3-L1 adipocytes were co-stimulated with TLR agonists (LPS, MALP-2, Pam3CSK4, pI:C) and recombinant CTRP-3. In a SIRS model, C57BL/6 wild-type mice were intraperitoneally (ip) injected with recombinant CTRP-3 prior to LPS. CAMP expression was analyzed by real-time PCR in AT of wild-type mice and in AT and primary adipocytes from transgenic mice lacking adipocyte CTRP-3 expression. Comparative transcriptome analysis by RNA seq. was applied in CTRP-3 KO adipocytes. RESULTS In vitro, CTRP-3 antagonized TLR4- and TLR1/2-induced CAMP expression in adipocytes whereas TLR3- and TLR2/6-mediated induction of CAMP was not affected. in vivo, application of exogenous CTRP-3 dose-dependently antagonized LPS-induced CAMP expression in intra-abdominal AT. CAMP expression in total AT and in primary adipocytes of subcutaneous and intra-abdominal AT did not differ between wild-type mice and transgenic mice lacking adipocyte CTRP-3 expression. CONCLUSIONS The study suggests a hypothetical role of CAMP in host defense not only against Gram-positive bacteria sensed by TLR1/2 and TLR2/6 but also against Gram-negative bacteria sensed by TLR4 and potentially against viruses sensed by TLR3. The machinery of TLR-mediated pro-inflammatory activation of the CAMP gene in adipocytes seems to be partly modulated by secreted adipokines belonging to the growing family of C1q/TNF-related proteins such as CTRP-3.
Collapse
Affiliation(s)
- Thomas Karrasch
- Department of Internal Medicine III, University of Giessen, Germany
| | | | | | - Andreas Schmid
- Department of Internal Medicine III, University of Giessen, Germany.
| |
Collapse
|
2
|
Jeong SK, Kim YI, Shin KO, Kim BW, Lee SH, Jeon JE, Kim HJ, Lee YM, Mauro TM, Elias PM, Uchida Y, Park K. Sphingosine kinase 1 activation enhances epidermal innate immunity through sphingosine-1-phosphate stimulation of cathelicidin production. J Dermatol Sci 2015; 79:229-34. [PMID: 26113114 DOI: 10.1016/j.jdermsci.2015.06.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 05/06/2015] [Accepted: 06/16/2015] [Indexed: 12/30/2022]
Abstract
BACKGROUND The ceramide metabolite, sphingosine-1-phosphate (S1P), regulates multiple cellular functions in keratinocytes (KC). We recently discovered that production of a key innate immune element, cathelicidin antimicrobial peptide (CAMP), is stimulated via a NF-κB-dependent mechanism that is activated by S1P when S1P is generated by sphingosine kinase (SPHK) 1. OBJECTIVE We investigated whether pharmacological modulation of SPHK1 activity, using a novel synthetic SPHK1 activator, (S)-methyl 2-(hexanamide)-3-(4-hydroxyphenyl) propanoate (MHP), stimulates CAMP expression. METHODS MHP-mediated changes in both S1P and CAMP downstream mediators were analyzed in normal cultured human KC by qRT-PCR, Western immunoblot, ELISA, confocal microscopy for immunohistochemistry, HPLC and ESI-LC/MS/MS, and microbial pathogen invasion/colonization in a human epidermal organotypic model. RESULTS Treatment with MHP directly activated SPHK1 and increased cellular S1P content in normal cultured human KC. Because MHP did not inhibit S1P lyase activity, which hydrolyses S1P, augumented S1P levels could be attributed to increased synthesis rather than blockade of S1P degradation. Next, we found that exogenous MHP significantly stimulated CAMP mRNA and protein production in KC, increases that were significantly suppressed by siRNA directed against SPHK1, but not by a scrambled control siRNA. NF-κB activation, assessed by nuclear translocation of NF-κB, occurred in cells following incubation with MHP. Conversely, pretreatment with a specific inhibitor of SPHK1 decreased MHP-induced nuclear translocation of NF-κB, and significantly attenuated the MHP-mediated increase in CAMP production. Finally, topical MHP significantly suppressed invasion of the virulent Staphylococcus aureus into murine skin explants. CONCLUSION MHP activation of SPHK1, a target enzyme of CAMP production, can stimulate innate immunity.
Collapse
|
3
|
Park K, Lee S, Lee YM. Sphingolipids and antimicrobial peptides: function and roles in atopic dermatitis. Biomol Ther (Seoul) 2014; 21:251-7. [PMID: 24244808 PMCID: PMC3819896 DOI: 10.4062/biomolther.2013.058] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 07/24/2013] [Accepted: 07/25/2013] [Indexed: 12/14/2022] Open
Abstract
Inflammatory skin diseases such as atopic dermatitis (AD) and rosacea were complicated by barrier abrogation and deficiency in innate immunity. The first defender of epidermal innate immune response is the antimicrobial peptides (AMPs) that exhibit a broad-spectrum antimicrobial activity against multiple pathogens, including Gram-positive and Gram-negative bacteria, viruses, and fungi. The deficiency of these AMPs in the skin of AD fails to protect our body against virulent pathogen infections. In contrast to AD where there is a suppression of AMPs, rosacea is characterized by overexpression of cathelicidin antimicrobial peptide (CAMP), the products of which result in chronic epidermal inflammation. In this regard, AMP generation that is controlled by a key ceramide metabolite S1P-dependent mechanism could be considered as alternate therapeutic approaches to treat these skin disorders, i.e., Increased S1P levels strongly stimulated the CAMP expression which elevated the antimicrobial activity against multiple pathogens resulting the improved AD patient skin.
Collapse
Affiliation(s)
- Kyungho Park
- Department of Dermatology, School of Medicine, University of California, San Francisco, California CA94115, USA
| | | | | |
Collapse
|
4
|
Park K, Kim YI, Shin KO, Seo HS, Kim JY, Mann T, Oda Y, Lee YM, Holleran WM, Elias PM, Uchida Y. The dietary ingredient, genistein, stimulates cathelicidin antimicrobial peptide expression through a novel S1P-dependent mechanism. J Nutr Biochem 2014; 25:734-40. [PMID: 24768661 DOI: 10.1016/j.jnutbio.2014.03.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 02/17/2014] [Accepted: 03/04/2014] [Indexed: 02/07/2023]
Abstract
We recently discovered that a signaling lipid, sphingosine-1-phosphate (S1P), generated by sphingosine kinase 1, regulates a major epidermal antimicrobial peptide's [cathelicidin antimicrobial peptide (CAMP)] expression via an NF-κB→C/EBPα-dependent pathway, independent of vitamin D receptor (VDR) in epithelial cells. Activation of estrogen receptors (ERs) by either estrogens or phytoestrogens also is known to stimulate S1P production, but it is unknown whether ER activation increases CAMP production. We investigated whether a phytoestrogen, genistein, simulates CAMP expression in keratinocytes, a model of epithelial cells, by either a S1P-dependent mechanism(s) or the alternate VDR-regulated pathway. Exogenous genistein, as well as an ER-β ligand, WAY-200070, increased CAMP mRNA and protein expression in cultured human keratinocytes, while ER-β antagonist, ICI182780, attenuated the expected genistein- and WAY-200070-induced increase in CAMP mRNA/protein expression. Genistein treatment increased acidic and alkaline ceramidase expression and cellular S1P levels in parallel with increased S1P lyase inhibition, accounting for increased CAMP production. In contrast, siRNA against VDR did not alter genistein-mediated up-regulation of CAMP. Taken together, genistein induces CAMP production via an ER-β→S1P→NF-κB→C/EBPα- rather than a VDR-dependent mechanism, illuminating a new role for estrogens in the regulation of epithelial innate immunity and pointing to potential additional benefits of dietary genistein in enhancing cutaneous antimicrobial defense.
Collapse
Affiliation(s)
- Kyungho Park
- Department of Dermatology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA; Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Young-Il Kim
- Department of Dermatology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA; Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Kyong-Oh Shin
- College of Pharmacy, Chungbuk National University, Cheongju 361-763, South Korea
| | - Ho Seong Seo
- Radiation Research Division, Korea Atomic Energy Research Institute, Jeongeup 580-185, South Korea
| | - Jong Youl Kim
- Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA; Department of Medicine and Endocrinology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA
| | - Taj Mann
- Department of Dermatology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA; Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Yuko Oda
- Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA; Department of Medicine and Endocrinology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA
| | - Yong-Moon Lee
- College of Pharmacy, Chungbuk National University, Cheongju 361-763, South Korea
| | - Walter M Holleran
- Department of Dermatology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA; Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Peter M Elias
- Department of Dermatology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA; Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Yoshikazu Uchida
- Department of Dermatology, School of Medicine, University of California, San Francisco, San Francisco, CA 94121, USA; Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA; Northern California Institute for Research and Education, San Francisco, CA 94121, USA.
| |
Collapse
|
5
|
Guo C, Sinnott B, Niu B, Lowry MB, Fantacone ML, Gombart AF. Synergistic induction of human cathelicidin antimicrobial peptide gene expression by vitamin D and stilbenoids. Mol Nutr Food Res 2013; 58:528-536. [PMID: 24039193 DOI: 10.1002/mnfr.201300266] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 07/25/2013] [Accepted: 07/26/2013] [Indexed: 11/07/2022]
Abstract
SCOPE The cathelicidin antimicrobial peptide (CAMP) gene is induced by 1α,25-dihydroxyvitamin D3 (1α,25(OH)2 D3), lithocholic acid, curcumin, nicotinamide, and butyrate. Discovering additional small molecules that regulate its expression will identify new molecular mechanisms involved in CAMP regulation and increase understanding of how diet and nutrition can improve immune function. METHODS AND RESULTS We discovered that two stilbenoids, resveratrol and pterostilbene, induced CAMP promoter-luciferase expression. Synergistic activation was observed when either stilbenoid was combined with 1α,25(OH)2 D3. Both stilbenoids increased CAMP mRNA and protein levels in the monocyte cell line U937 and synergy was observed in both U937 and the keratinocyte cell line, HaCaT. Inhibition of resveratrol targets sirtuin-1, cyclic AMP production and the c-Jun N-terminal, phosphoinositide 3 and AMP-activated kinases did not block induction of CAMP by resveratrol or synergy with 1α,25(OH)2 D3. Nevertheless, inhibition of the extracellular signal regulated 1/2 and p38 mitogen-activated protein kinases, increased CAMP gene expression in combination with 1α,25(OH)2 D3 suggesting that inhibition of these kinases by resveratrol may explain, in part, its synergy with vitamin D. CONCLUSION Our findings demonstrate for the first time that stilbenoid compounds may have the potential to boost the innate immune response by increasing CAMP gene expression, particularly in combination with 1α,25(OH)2 D3.
Collapse
Affiliation(s)
- Chunxiao Guo
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97331.,Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331
| | - Brian Sinnott
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97331.,Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331
| | - Brenda Niu
- School of Medicine, Oregon Health Sciences University, Portland, Oregon 97239
| | - Malcolm B Lowry
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97331.,Department of Microbiology, Oregon State University, Corvallis, Oregon 97331
| | - Mary L Fantacone
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97331.,Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331
| | - Adrian F Gombart
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97331.,Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331
| |
Collapse
|