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Gray JM, Major K, Castillo-Ruiz A, Shipley M, Gangappa S, Forger NG. The inflammatory response to birth requires MyD88 and is driven by both mother and offspring. Brain Behav Immun 2024; 115:617-630. [PMID: 37967662 DOI: 10.1016/j.bbi.2023.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 10/15/2023] [Accepted: 11/11/2023] [Indexed: 11/17/2023] Open
Abstract
Birth is an inflammatory event for the newborn, characterized by elevations in interleukin (IL)-6, IL-10, and tumor necrosis factor (TNF)-α peripherally and/or centrally, as well as changes in brain microglia. However, the mechanism(s) underlying these responses is unknown. Toll-like receptors (TLRs) play crucial roles in innate immunity and initiate inflammatory cascades upon recognition of endogenous or exogenous antigens. Most TLR signaling depends on the adaptor molecule myeloid differentiation primary response 88 (MyD88). We independently varied MyD88 gene status in mouse dams and their offspring to determine whether the inflammatory response to birth depends on MyD88 signaling and, if so, whether that signaling occurs in the offspring, the mother, or both. We find that the perinatal surges in plasma IL-6 and brain expression of TNF-α depend solely on MyD88 gene status of the offspring, whereas postnatal increases in plasma IL-10 and TNF-α depend on MyD88 in both the pup and dam. Interestingly, MyD88 genotype of the dam primarily drives differences in offspring brain microglial density and has robust effects on developmental neuronal cell death. Milk cytokines were evaluated as a possible source of postnatal maternal influence; although we found high levels of CXCL1/GROα and several other cytokines in ingested post-partum milk, their presence did not require MyD88. Thus, the inflammatory response previously described in the late-term fetus and newborn depends on MyD88 (and, by extension, TLRs), with signaling in both the dam and offspring contributing. Unexpectedly, naturally-occuring neuronal cell death in the newborn is modulated primarily by maternal MyD88 gene status.
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Affiliation(s)
- Jennifer M Gray
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | - Kharli Major
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA
| | | | - Michael Shipley
- Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Shivaprakash Gangappa
- Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Nancy G Forger
- Neuroscience Institute, Georgia State University, Atlanta, GA 30303, USA.
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Anders G, Hassiepen U, Theisgen S, Heymann S, Muller L, Panigada T, Huster D, Samsonov SA. The Intrinsic Pepsin Resistance of Interleukin-8 Can Be Explained from a Combined Bioinformatical and Experimental Approach. IEEE/ACM TRANSACTIONS ON COMPUTATIONAL BIOLOGY AND BIOINFORMATICS 2018; 15:300-308. [PMID: 28113517 DOI: 10.1109/tcbb.2016.2614821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Interleukin-8 (IL-8, CXCL8) is a neutrophil chemotactic factor belonging to the family of chemokines. IL-8 was shown to resist pepsin cleavage displaying its high resistance to this protease. However, the molecular mechanisms underlying this resistance are not fully understood. Using our in-house database containing the data on three-dimensional arrangements of secondary structure elements from the whole Protein Data Bank, we found a striking structural similarity between IL-8 and pepsin inhibitor-3. Such similarity could play a key role in understanding IL-8 resistance to the protease pepsin. To support this hypothesis, we applied pepsin assays confirming that intact IL-8 is not degraded by pepsin in comparison to IL-8 in a denaturated state. Applying 1H-15N Heteronuclear Single Quantum Coherence NMR measurements, we determined the putative regions at IL-8 that are potentially responsible for interactions with the pepsin. The results obtained in this work contribute to the understanding of the resistance of IL-8 to pepsin proteolysis in terms of its structural properties.
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Lee YJ, Lim T, Han MS, Lee SH, Baek SH, Nan HY, Lee C. Anticancer effect of luteolin is mediated by downregulation of TAM receptor tyrosine kinases, but not interleukin-8, in non-small cell lung cancer cells. Oncol Rep 2017; 37:1219-1226. [PMID: 28035396 DOI: 10.3892/or.2016.5336] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 10/10/2016] [Indexed: 12/14/2022] Open
Abstract
TAM receptor tyrosine kinases (RTKs), Tyro3, Axl and MerTK, transduce diverse signals responsible for cell survival, growth, proliferation and anti-apoptosis. In the present study, we demonstrated the effect of luteolin, a flavonoid with antioxidant, anti-inflammatory and anticancer activities, on the expression and activation of TAM RTKs and the association with its cytotoxicity in non-small cell lung cancer (NSCLC) cells. We observed the cytotoxic effect of luteolin in parental A549 and H460 cells as well as in cisplatin-resistant A549/CisR and H460/CisR cells. Exposure of these cells to luteolin also resulted in a dose‑dependent decrease in clonogenic ability. Next, luteolin was found to decrease the protein levels of all three TAM RTKs in the A549 and A549/CisR cells in a dose‑dependent manner. In a similar manner, in H460 and H460/CisR cells, the protein levels of Axl and Tyro3 were decreased following luteolin treatment. In addition, Axl promoter activity was decreased by luteolin, indicating that luteolin suppresses Axl expression at the transcriptional level. We next found that luteolin abrogated Axl phosphorylation in response to growth arrest-specific 6 (Gas6), its ligand, implying the inhibitory effect of luteolin on Gas6-induced Axl activation. Ectopic expression of Axl was observed to attenuate the antiproliferative effect of luteolin, while knockdown of the Axl protein level using a gold nanoparticle-assisted gene delivery system increased its cytotoxicity. In contrast to the inhibitory effect of luteolin on the expression of TAM RTKs, interleukin-8 (IL-8) production was not decreased by luteolin in H460 and H460/CisR cells, while IL-8 production/cell was increased. Collectively, our data suggest that TAM RTKs, but not IL-8, are promising therapeutic targets of luteolin to abrogate cell proliferation and to overcome chemoresistance in NSCLC cells.
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Affiliation(s)
- Youn Ju Lee
- Department of Pharmacology, College of Medicine, Catholic University of Daegu, Daegu 47472, Republic of Korea
| | - Taeho Lim
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Min Su Han
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Sun-Hwa Lee
- New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 40161, Republic of Korea
| | - Suk-Hwan Baek
- Department of Biochemistry and Molecular Biology, School of Medicine, Yeungnam University, Daegu 42415, Republic of Korea
| | - Hong-Yan Nan
- Department of Biochemistry and Molecular Biology, School of Medicine, Yeungnam University, Daegu 42415, Republic of Korea
| | - Chuhee Lee
- Department of Biochemistry and Molecular Biology, School of Medicine, Yeungnam University, Daegu 42415, Republic of Korea
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Nguyen DN, Sangild PT, Ostergaard MV, Bering SB, Chatterton DEW. Transforming growth factor-β2 and endotoxin interact to regulate homeostasis via interleukin-8 levels in the immature intestine. Am J Physiol Gastrointest Liver Physiol 2014; 307:G689-99. [PMID: 25147235 DOI: 10.1152/ajpgi.00193.2014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A balance between pro- and anti-inflammatory signals from milk and microbiota controls intestinal homeostasis just after birth, and an optimal balance is particularly important for preterm neonates that are sensitive to necrotizing enterocolitis (NEC). We suggest that the intestinal cytokine IL-8 plays an important role and hypothesize that transforming growth factor-β2 (TGF-β2) acts in synergy with bacterial lipopolysaccharide (LPS) to control IL-8 levels, thereby supporting intestinal homeostasis. Preterm pigs were fed colostrum (containing TGF-β2) or infant formula (IF) with or without antibiotics (COLOS, n = 27; ANTI, n = 11; IF, n = 40). Intestinal IL-8 levels and NEC incidence were much higher in IF than in COLOS and ANTI pigs (P < 0.001), but IL-8 levels did not correlate with NEC severity. Intestinal TGF-β2 levels were high in COLOS but low in IF and ANTI pigs. Based on these observations, the interplay among IL-8, TGF-β2, and LPS was investigated in a porcine intestinal epithelial cell line. TGF-β2 attenuated LPS-induced IL-6, IL-1β, and TNF-α release by reducing early ERK activation, whereas IL-8 secretion was synergistically induced by LPS and TGF-β2 via NF-κB. The TGF-β2/LPS-induced IL-8 levels stimulated cell proliferation and migration following epithelial injury, without continuous NF-κB activation and cyclooxygenase-2 expression. We suggest that a combined TGF-β2-LPS induction of IL-8 stimulates epithelial repair just after birth when the intestine is first exposed to colonizing bacteria and TGF-β2-containing milk. Moderate IL-8 levels may act to control intestinal inflammation, whereas excessive IL-8 production may enhance the damaging proinflammatory cascade leading to NEC.
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Affiliation(s)
- Duc Ninh Nguyen
- Faculty of Science, Department of Food Science, University of Copenhagen, Copenhagen, Denmark; and
| | - Per T Sangild
- Faculty of Science, Department of Nutrition, Exercise, and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Mette V Ostergaard
- Faculty of Science, Department of Nutrition, Exercise, and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Stine B Bering
- Faculty of Science, Department of Nutrition, Exercise, and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Dereck E W Chatterton
- Faculty of Science, Department of Food Science, University of Copenhagen, Copenhagen, Denmark; and Faculty of Science, Department of Nutrition, Exercise, and Sports, University of Copenhagen, Copenhagen, Denmark
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Amoudruz P, Holmlund U, Schollin J, Sverremark-Ekström E, Montgomery SM. Maternal country of birth and previous pregnancies are associated with breast milk characteristics. Pediatr Allergy Immunol 2009; 20:19-29. [PMID: 18484963 DOI: 10.1111/j.1399-3038.2008.00754.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Populations in high infectious exposure countries are at low risk of some immune-mediated diseases such as Crohn's disease and allergy. This low risk is maintained upon immigration to an industrialized country, but the offspring of such immigrants have a higher immune-mediated disease risk than the indigenous population. We hypothesize that early life exposures in a developing country shape the maternal immune system, which could have implications for the offspring born in a developed country with a low infectious load. The aim of this study was to investigate if exposures in childhood (indicated by country of origin) and subsequent exposures influence immunologic characteristics relevant to stimulation of offspring. Breast milk components among 64 mothers resident in Sweden, 32 of whom immigrated from a developing country, were examined using the ELISA and Cytometric Bead Array methods. Immigrants from a developing country had statistically significantly higher levels of breast milk interleukin-6 (IL-6), IL-8 and transforming growth factor-beta1. A larger number of previous pregnancies were associated with down-regulation of several substances, statistically significant for soluble CD14 and IL-8. The results suggest that maternal country of birth may influence adult immune characteristics, potentially relevant to disease risk in offspring. Such a mechanism may explain the higher immune-mediated disease risk among children of migrants from a developing to developed country. Older siblings may influence disease risk through the action of previous pregnancies on maternal immune characteristics.
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Affiliation(s)
- Petra Amoudruz
- Department of Immunology, Wenner-Gren Institute, Stockholm University, Sweden.
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Shaik SS, Soltau TD, Chaturvedi G, Totapally B, Hagood JS, Andrews WW, Athar M, Voitenok NN, Killingsworth CR, Patel RP, Fallon MB, Maheshwari A. Low intensity shear stress increases endothelial ELR+ CXC chemokine production via a focal adhesion kinase-p38{beta} MAPK-NF-{kappa}B pathway. J Biol Chem 2008; 284:5945-55. [PMID: 19117939 DOI: 10.1074/jbc.m807205200] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
CXC chemokines with a glutamate-leucine-arginine (ELR) tripeptide motif (ELR(+) CXC chemokines) play an important role in leukocyte trafficking into the tissues. For reasons that are not well elucidated, circulating leukocytes are recruited into the tissues mainly in small vessels such as capillaries and venules. Because ELR(+) CXC chemokines are important mediators of endothelial-leukocyte interaction, we compared chemokine expression by microvascular and aortic endothelium to investigate whether differences in chemokine expression by various endothelial types could, at least partially, explain the microvascular localization of endothelial-leukocyte interaction. Both in vitro and in vivo models indicate that ELR(+) CXC chemokine expression is higher in microvascular endothelium than in aortic endothelial cells. These differences can be explained on the basis of the preferential activation of endothelial chemokine production by low intensity shear stress. Low shear activated endothelial ELR(+) CXC chemokine production via cell surface heparan sulfates, beta(3)-integrins, focal adhesion kinase, the mitogen-activated protein kinase p38beta, mitogen- and stress-associated protein kinase-1, and the transcription factor.
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Affiliation(s)
- Sadiq S Shaik
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama 35233, USA
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McPherson RJ, Juul SE. High-dose erythropoietin inhibits apoptosis and stimulates proliferation in neonatal rat intestine. Growth Horm IGF Res 2007; 17:424-430. [PMID: 17632025 DOI: 10.1016/j.ghir.2007.05.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2007] [Revised: 05/30/2007] [Accepted: 05/31/2007] [Indexed: 11/18/2022]
Abstract
BACKGROUND Erythropoietin (Epo) receptors are widely expressed in the small bowel of neonatal rats and evidence suggests Epo has important trophic effects in developing bowel. OBJECTIVE To compliment in vitro data, we directly examine in vivo the hypotheses that systemic Epo treatment can promote cell division and enterocyte migration, and arrest apoptosis in the ileum of neonatal rats. DESIGN Epo (5000 U/kg s.c.) or vehicle treatments were given to one week old Sprague-Dawley rats (n = 86) along with timed injections of the thymidine analog 5-bromo-2-deoxyuridine (BrdU, 50mg/kg s.c.) to label DNA synthesis and track newly proliferating cells. To characterize the time course of effects, animals were killed at scheduled times from 30 min to 24 h after treatment. BrdU-containing cells were immunostained and counted in intestinal crypts, villi, and muscle wall of ileum. Effects of Epo on apoptosis were analyzed by TUNEL staining. Calibrated measurements were made to determine the density or relative proportion of BrdU- and TUNEL-positive cells. RESULTS Systemic high-dose Epo promoted cell division in intestinal smooth muscle and enterocytes, stimulated migration of intestinal epithelial cells, and arrested apoptosis of enterocytes at the villous tips. CONCLUSION These data provide in vivo evidence that Epo functions trophically in developing intestine tissues.
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