251
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Pighetti GM, Elliott AA. Gene polymorphisms: the keys for marker assisted selection and unraveling core regulatory pathways for mastitis resistance. J Mammary Gland Biol Neoplasia 2011; 16:421-32. [PMID: 21997401 DOI: 10.1007/s10911-011-9238-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Accepted: 09/23/2011] [Indexed: 12/11/2022] Open
Abstract
One of the most frequent mammary diseases impacting lactating animals is mastitis, an inflammation of the mammary gland most commonly caused by bacterial infection. The severity of mastitis is greatly influenced by the invading organism and the subsequent immune response which must recognize the foreign organism, recruit immune cells, eliminate the invading pathogen, and resolve the inflammatory response. The speed, strength, and duration of this response and subsequent disease susceptibility are critically tied to the genetic background of an animal. However, the genetic contribution has been difficult to identify due to the complex interactions that must occur for effective disease resistance. Recent studies have utilized polymorphisms to better define the genes and chromosomal regions that contribute to mastitis resistance. This review will examine these studies with primary emphasis in bovine systems, as the most work regarding mastitis has been conducted in this species.
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Affiliation(s)
- Gina M Pighetti
- Department of Animal Science, The University of Tennessee, Knoxville, TN 37996, USA.
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252
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Aran A, Lin L, Finn LA, Weiner K, Peppard P, Young T, Mignot E. Post-streptococcal antibodies are associated with metabolic syndrome in a population-based cohort. PLoS One 2011; 6:e25017. [PMID: 21949836 PMCID: PMC3176794 DOI: 10.1371/journal.pone.0025017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Accepted: 08/22/2011] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Streptococcal infections are known to trigger autoimmune disorders, affecting millions worldwide. Recently, we found an association between post-streptococcal autoantibodies against Protein Disulphide Isomerase (PDI), an enzyme involved in insulin degradation and insulin resistance. This led us to evaluate associations between post-streptococcal antibodies and metabolic syndrome, as defined by the updated National Cholesterol Education Program definition, 2005. METHODS AND FINDINGS Metabolic data (HDL, triglycerides, fasting glucose, blood pressure, waist circumference, BMI, smoking), post-streptococcal antibodies (anti-Streptolysin O (ASO) and anti-PDI), and C-reactive protein (CRP, as a general inflammatory marker), were assessed in 1156 participants of the Wisconsin Sleep Cohort Study. Anti-PDI antibodies were found in 308 participants (26.6%), ASO≥100 in 258 (22.3%), and 482 (41.7%) met diagnostic criteria for metabolic syndrome. Anti-PDI antibodies but not ASO were significantly associated with metabolic syndrome [n = 1156, OR 1.463 (95% CI 1.114, 1.920), p = 0.0062; adjusted for age, gender, education, smoking]. Importantly, the anti-PDI-metabolic syndrome association remained significant after adjusting for CRP and fasting insulin. CONCLUSIONS Post-streptococcal anti-PDI antibodies are associated with metabolic syndrome regardless of fasting insulin and CRP levels. Whereas these data are in line with a growing body of evidence linking infections, immunity and metabolism, additional studies are necessary to establish the post-streptococcal-metabolic syndrome association.
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Affiliation(s)
- Adi Aran
- Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, United States of America
- Shaare Zedek Medical Center, Jerusalem, Israel
| | - Ling Lin
- Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, United States of America
| | - Laurel Ann Finn
- Department of Population Health Sciences, University of Wisconsin, Madison, Wisconsin, United State of America
| | - Karin Weiner
- Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, United States of America
| | - Paul Peppard
- Department of Population Health Sciences, University of Wisconsin, Madison, Wisconsin, United State of America
| | - Terry Young
- Department of Population Health Sciences, University of Wisconsin, Madison, Wisconsin, United State of America
| | - Emmanuel Mignot
- Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, United States of America
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253
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Molvarec A, Szarka A, Walentin S, Bekő G, Karádi I, Prohászka Z, Rigó Jr J. Serum leptin levels in relation to circulating cytokines, chemokines, adhesion molecules and angiogenic factors in normal pregnancy and preeclampsia. Reprod Biol Endocrinol 2011; 9:124. [PMID: 21906313 PMCID: PMC3184629 DOI: 10.1186/1477-7827-9-124] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Accepted: 09/09/2011] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVE In this study, we determined circulating levels of C-reactive protein, several cytokines, chemokines, adhesion molecules and angiogenic factors along with those of leptin in healthy non-pregnant and pregnant women and preeclamptic patients, and investigated whether serum leptin levels were related to the clinical characteristics and measured laboratory parameters of the study participants. METHODS Sixty preeclamptic patients, 60 healthy pregnant women and 59 healthy non-pregnant women were involved in this case-control study. Levels of leptin and transforming growth factor (TGF)-beta1 in maternal sera were assessed by ELISA. Serum levels of interleukin (IL)-1beta, IL-1 receptor antagonist (IL-1ra), IL-2, IL-4, IL-6, IL-8, IL-10, IL-12p40, IL-12p70, IL-18, interferon (IFN)-gamma, tumor necrosis factor (TNF)-alpha, interferon-gamma-inducible protein (IP)-10, monocyte chemotactic protein (MCP)-1, intercellular adhesion molecule (ICAM)-1 and vascular cell adhesion molecule (VCAM)-1 were determined by multiplex suspension array. Serum C-reactive protein (CRP) concentrations were measured by an autoanalyzer. Serum total soluble fms-like tyrosine kinase-1 (sFlt-1) and biologically active placental growth factor (PlGF) levels were determined by electrochemiluminescence immunoassay. For statistical analyses, non-parametric methods were applied. RESULTS There were significant differences in most of the measured laboratory parameters among the three study groups except for serum IL-1beta and TGF-beta1 levels. Serum leptin levels were significantly higher in preeclamptic patients and healthy pregnant women than in healthy non-pregnant women. Additionally, preeclamptic patients had significantly higher leptin levels as compared to healthy pregnant women. Serum leptin levels were independently associated with BMI in healthy non-pregnant women. In healthy pregnant women, both BMI and serum CRP concentrations showed significant positive linear association with leptin levels. There were significant positive correlations between serum leptin concentrations of healthy pregnant women and systolic blood pressure, as well as serum levels of IP-10, while their serum leptin levels correlated inversely with fetal birth weight. In preeclamptic patients, a significant positive correlation was observed between serum concentrations of leptin and IP-10. Furthermore, elevated serum leptin level and sFlt-1/PlGF ratio had an additive (joint) effect in the risk of preeclampsia, as shown by the substantially higher odds ratios of their combination than of either alone. CONCLUSIONS Simultaneous measurement of leptin with several inflammatory molecules and angiogenic factors in this study enabled us to investigate their relationship, which can help to understand the role of circulating leptin in normal pregnancy and preeclampsia.
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Affiliation(s)
- Attila Molvarec
- First Department of Obstetrics and Gynecology, Semmelweis University, Budapest, Hungary
| | - András Szarka
- First Department of Obstetrics and Gynecology, Semmelweis University, Budapest, Hungary
| | - Szilvia Walentin
- Central Laboratory, Kútvölgyi Clinical Center, Semmelweis University, Budapest, Hungary
| | - Gabriella Bekő
- Department of Laboratory Medicine, Semmelweis University, Budapest, Hungary
| | - István Karádi
- Third Department of Internal Medicine, Semmelweis University, Budapest, Hungary
| | - Zoltán Prohászka
- Third Department of Internal Medicine, Semmelweis University, Budapest, Hungary
- Research Group of Inflammation Biology and Immunogenomics, Hungarian Academy of Sciences, Budapest, Hungary
| | - János Rigó Jr
- First Department of Obstetrics and Gynecology, Semmelweis University, Budapest, Hungary
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254
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Fonfara S, Hetzel U, Tew SR, Dukes-McEwan J, Cripps P, Clegg PD. Leptin expression in dogs with cardiac disease and congestive heart failure. J Vet Intern Med 2011; 25:1017-24. [PMID: 21985137 DOI: 10.1111/j.1939-1676.2011.00782.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 06/04/2011] [Accepted: 07/06/2011] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Leptin belongs to the group of adipokines and has recently attracted attention because of its effects on the cardiovascular system. Increased leptin concentrations are reported in obese dogs but its role in cardiac disease (CD) is not known. Therefore, we investigated leptin expression in blood samples from dogs with congestive heart failure (CHF), and from myocardial samples of dogs with CDs. METHODS Leptin mRNA was analyzed from blood samples of 8 dogs presented for cardiac screening in which no abnormalities were detected and 8 dogs in CHF. In addition, myocardial samples (interventricular septum, right and left atria, and ventricles) of 10 dogs with no cardiac abnormalities (controls), 7 dogs with acquired and 3 dogs with congenital CDs were investigated using real-time polymerase chain reaction (PCR). RESULTS Dogs with CHF had significantly higher blood concentrations of leptin mRNA than dogs without CD (P = .013). Myocardial leptin expression was significantly increased in acquired (P = .035) and decreased in congenital CD (P = .016) in comparison to controls. Dogs in heart failure stage D showed higher myocardial leptin concentrations than dogs in stage C3 and B (P = .031). Differences according to myocardial region (P < .05) were detected and higher leptin concentrations were present in the atria in comparison to the ventricles in dogs with CD (P = .005). Comparing male and female dogs with CD revealed higher leptin concentrations in female dogs (P = .001). CONCLUSIONS These results indicate leptin mRNA concentrations vary with CD, severity of CD, myocardial region, and possibly sex. Therefore, leptin might play a role in canine CD.
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Affiliation(s)
- S Fonfara
- University of Liverpool, School of Veterinary Science, Neston, UK.
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255
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Oh EG, Bang SY, Kim SH, Hyun SS, Chu SH, Jeon JY, Im JA, Lee JE, Lee MK. Therapeutic lifestyle modification program reduces plasma levels of the chemokines CRP and MCP-1 in subjects with metabolic syndrome. Biol Res Nurs 2011; 15:48-55. [PMID: 21859748 DOI: 10.1177/1099800411416637] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE The purpose of this study was to examine the effects of a 6-month therapeutic lifestyle modification (TLM) program on chemokines related to oxidative stress, inflammation, endothelial dysfunction, and arterial stiffness in subjects with metabolic syndrome (MetS). METHODS The authors performed a randomized controlled trial, assigning 52 women (mean age 62.7 ± 9.0 years) with MetS to a TLM intervention group (n = 31) or a control group (n = 21). The authors provided the TLM intervention group with health screening, exercise, low-calorie diet, and health education and counseling for 6 months and instructed the control group to maintain their usual lifestyle behaviors. Outcome variables included levels of myeloperoxidase (MPO), oxidized low-density lipoprotein (LDL), adiponectin, leptin, resistin, high-sensitivity C-reactive protein (hs-CRP), interleukin-1β, interleukin-6, tumor necrosis factor-alpha (TNF-α), CD40L, monocyte chemotactic protein-1 (MCP-1), retinol-binding protein 4 (RBP-4), endothelin-1, and brachial-ankle pulse wave velocity. The authors used generalized estimating equation (GEE) analyses to estimate the effects of the TLM program. RESULTS After the 6-month TLM program, hs-CRP levels decreased significantly, and MCP-1 levels increased at a significantly slower rate in the TLM group than they did in the control group (all p < .05). CONCLUSION These results indicate that a TLM program could be effective for improving patient inflammatory states and may also be effective in preventing cardiovascular complications in subjects with MetS.
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Affiliation(s)
- Eui Geum Oh
- College of Nursing, Nursing Policy and Research Institution, Yonsei University, Seoul, Korea.
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256
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Moss M, Standiford TJ. Leptin in fibroproliferative acute respiratory distress syndrome: not just a satiety factor. Am J Respir Crit Care Med 2011; 183:1443-4. [PMID: 21642251 DOI: 10.1164/rccm.201102-0286ed] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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257
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Unravelling the effects of the environment and host genotype on the gut microbiome. Nat Rev Microbiol 2011; 9:279-90. [PMID: 21407244 DOI: 10.1038/nrmicro2540] [Citation(s) in RCA: 989] [Impact Index Per Article: 76.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
To what extent do host genetics control the composition of the gut microbiome? Studies comparing the gut microbiota in human twins and across inbred mouse lines have yielded inconsistent answers to this question. However, candidate gene approaches, in which one gene is deleted or added to a model host organism, show that a single host gene can have a tremendous effect on the diversity and population structure of the gut microbiota. Now, quantitative genetics is emerging as a highly promising approach that can be used to better understand the overall architecture of host genetic influence on the microbiota, and to discover additional host genes controlling microbial diversity in the gut. In this Review, we describe how host genetics and the environment shape the microbiota, and how these three factors may interact in the context of chronic disease.
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258
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Vadacca M, Margiotta DPE, Navarini L, Afeltra A. Leptin in immuno-rheumatological diseases. Cell Mol Immunol 2011; 8:203-12. [PMID: 21399656 PMCID: PMC4012876 DOI: 10.1038/cmi.2010.75] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 12/16/2010] [Indexed: 01/29/2023] Open
Abstract
Leptin is one of the most important hormones secreted by adipocytes, with a variety of physiological roles related to the control of metabolism and energy homeostasis. Since its discovery in 1994, leptin has attracted increasing interest in the scientific community for its pleiotropic actions. One of these functions is the relationship between nutritional status and immune competence. It structurally resembles proinflammatory cytokines, such as IL-6 and IL-12. The cytokine-like structural characteristic of leptin is implicative of its function in regulating immune responses. The role of leptin in regulating immune responses has been assessed in vitro as well as in clinical studies. It has been shown that disease conditions of reduced leptin production are associated with increased infection susceptibility. Conversely, immune-mediated disorders, such as autoimmune diseases, are associated with the increased secretion of leptin and the production of proinflammatory pathogenic cytokines. In this paper, we review the most recent advances of the role of leptin in immune-rheumatological diseases, and we discuss whether strategies aimed at modifying leptin levels could represent innovative and therapeutic tools for autoimmune disorders.
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Affiliation(s)
- Marta Vadacca
- Department of Rheumatology and Clinical Medicine, University Campus Bio-Medico, Rome, Italy
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259
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Robker RL, Wu LLY, Yang X. Inflammatory pathways linking obesity and ovarian dysfunction. J Reprod Immunol 2011; 88:142-8. [PMID: 21333359 DOI: 10.1016/j.jri.2011.01.008] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 12/20/2010] [Accepted: 01/16/2011] [Indexed: 01/03/2023]
Abstract
This review summarizes some of the recent advances in obesity research and describes how we and others have built upon these findings to better understand the impact of obesity on granulosa cells, cumulus cells and oocytes within the ovaries of obese females. Obesity is associated with lipid accumulation in non-adipose tissue cells and the induction of oxidative stress and endoplasmic reticulum stress responses that are tightly linked with systemic inflammation. Analysis of ovarian cells and fluid of obese women indicates that these same mechanisms are activated in the ovary in response to obesity. Studies in mice support this and allow further dissection of the pathways by which diet-induced obesity contributes to changes in mitochondria and the endoplasmic reticulum. These studies are in their infancy but cumulatively provide basic information about the cellular mechanisms that may lead to the impaired ovulation and reduced oocyte developmental potential that is observed in obese females.
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Affiliation(s)
- Rebecca L Robker
- School of Paediatrics and Reproductive Health, Robinson Institute, University of Adelaide, Adelaide, South Australia 5005, Australia.
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260
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Cramer DW, Finn OJ. Epidemiologic perspective on immune-surveillance in cancer. Curr Opin Immunol 2011; 23:265-71. [PMID: 21277761 DOI: 10.1016/j.coi.2011.01.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Accepted: 01/06/2011] [Indexed: 10/18/2022]
Abstract
Common 'themes' in epidemiology related to cancer risk beg a comprehensive mechanistic explanation. As people age, risk for cancer increases. Obesity and smoking increase the risk for many types of cancer. History of febrile childhood diseases lowers the risk for melanomas, leukemias, non-Hodgkin's lymphoma (NHL), and ovarian cancer. Increasing number of ovulatory cycles uninterrupted by pregnancies correlate positively with breast, endometrial, and ovarian cancer risk while pregnancies and breastfeeding lower the risk for these cancers as well as cancers of the colon, lung, pancreas, and NHL. Chronic inflammatory events such as endometriosis or mucosal exposure to talc increase the risk for several types of cancer. Mechanisms so far considered are site specific and do not explain multiple associations. We propose that most of these events affect cancer immunosurveillance by changing the balance between an effective immune response and immune tolerance of an emerging cancer. We review recently published data that suggest that immune mechanisms underlie most of these observed epidemiologic associations with cancer risk.
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Affiliation(s)
- Daniel W Cramer
- Obsterics-Gynecology Epidemiology Center, Department of Obsterics and Gynecology, Brigham and Women's Hospital, Boston, MA 02115, USA.
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261
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Ceccarelli G, d'Ettorre G, Mancone M, Francone M, Vullo V. Accelerated coronary atherosclerosis after execution of percutaneous coronary intervention in patient with HIV/HCV coinfection: case report and review of the literature. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2011; 12:262-5. [PMID: 21273145 DOI: 10.1016/j.carrev.2010.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Accepted: 11/23/2010] [Indexed: 12/30/2022]
Abstract
Highly active antiretroviral therapy has greatly reduced AIDS-related morbidity and mortality; however, its widespread use has been associated with a marked rise in the frequency of cardiovascular diseases in patients with HIV. Moreover, HIV infection is associated with accelerated coronary atherosclerosis and vasculopathy, although the mechanisms underlying these findings have not been determined. We describe the case of a 45-year-old woman with HIV/HCV coinfection, irritable bowel syndrome, and accelerated progression of coronary atherosclerosis after execution of percutaneous coronary intervention (PCI). In this case, the rapidity of progression of atherosclerosis seems linked principally to chronic inflammation and excess immune activation that can depend by a concourse of factors (chronic C hepatitis, irritable bowel syndrome, PCI execution) not directly associated with traditional risk factors. Caregivers following HIV-infected patients should be aware of the increased risk of accelerated atherogenesis in these subjects, principally in case of presence of causes of intense immune activation.
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Affiliation(s)
- Giancarlo Ceccarelli
- Department of Infectious Diseases and Public Health, University of Rome Sapienza, Italy.
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262
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Cohen G, Raupachova J, Ilic D, Werzowa J, Hörl WH. Effect of leptin on polymorphonuclear leucocyte functions in healthy subjects and haemodialysis patients. Nephrol Dial Transplant 2011; 26:2271-81. [PMID: 21216885 DOI: 10.1093/ndt/gfq731] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Dysfunction of polymorphonuclear leucocytes (PMNLs) in end-stage renal disease (ESRD) patients contributes to a diminished immune defence. The serum levels of leptin are elevated in patients with ESRD. We analysed in vitro effects of leptin on PMNLs from healthy subjects (HS; n = 12) and haemodialysis (HD) patients (n = 15) before and after HD. METHODS PMNL oxidative burst and phagocytosis were tested by flow cytometry in whole blood. Chemotaxis of isolated PMNLs was assessed by the under-agarose method. To assess the involvement of leptin in PMNL signalling pathways, signal transduction inhibitors were used and the activity of intracellular kinases was investigated by western blotting, in vitro kinase assays and the Luminex technology. RESULTS Increasing the leptin level in the blood of HS leads to a reduced activation of the oxidative burst by Escherichia coli and phorbol 12-myristate 13-acetate. Activation of the oxidative burst is reduced in the blood of HD patients and the addition of leptin does not lead to further PMNL inhibition. Leptin at a concentration measured in HD patients significantly reduces the chemotaxis of PMNLs from HS but had no effect on PMNLs from ESRD patients before and also after HD treatment with high-flux dialysers. The phosphoinositide 3-kinase/Akt pathway is involved in the inhibitory effects of leptin. CONCLUSIONS In the presence of leptin, PMNLs from HS and HD patients respond differently to stimuli. The lack of response to leptin in PMNLs from HD patients cannot be influenced by HD.
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Affiliation(s)
- Gerald Cohen
- Department of Internal Medicine, Division of Nephrology and Hypertension, University of Cincinnati, Cincinnati, OH, USA.
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263
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Guo S, Liu M, Gonzalez-Perez RR. Role of Notch and its oncogenic signaling crosstalk in breast cancer. Biochim Biophys Acta Rev Cancer 2010; 1815:197-213. [PMID: 21193018 DOI: 10.1016/j.bbcan.2010.12.002] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Revised: 12/15/2010] [Accepted: 12/17/2010] [Indexed: 12/21/2022]
Abstract
The Notch signaling plays a key role in cell differentiation, survival, and proliferation through diverse mechanisms. Notch signaling is also involved in vasculogenesis and angiogenesis. Moreover, Notch expression is regulated by hypoxia and inflammatory cytokines (IL-1, IL-6 and leptin). Entangled crosstalk between Notch and other developmental signaling (Hedgehog and Wnt), and signaling triggered by growth factors, estrogens and oncogenic kinases, could impact on Notch targeted genes. Thus, alterations of the Notch signaling can lead to a variety of disorders, including human malignancies. Notch signaling is activated by ligand binding, followed by ADAM/tumor necrosis factor-α-converting enzyme (TACE) metalloprotease and γ-secretase cleavages that produce the Notch intracellular domain (NICD). Translocation of NICD into the nucleus induces the transcriptional activation of Notch target genes. The relationships between Notch deregulated signaling, cancer stem cells and the carcinogenesis process reinforced by Notch crosstalk with many oncogenic signaling pathways suggest that Notch signaling may be a critical drug target for breast and other cancers. Since current status of knowledge in this field changes quickly, our insight should be continuously revised. In this review, we will focus on recent advancements in identification of aberrant Notch signaling in breast cancer and the possible underlying mechanisms, including potential role of Notch in breast cancer stem cells, tumor angiogenesis, as well as its crosstalk with other oncogenic signaling pathways in breast cancer. We will also discuss the prognostic value of Notch proteins and therapeutic potential of targeting Notch signaling for cancer treatment.
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Affiliation(s)
- Shanchun Guo
- Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, GA 30310, USA
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264
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Abstract
The world is now experiencing an epidemic of obesity. Although the effects of obesity on the development of metabolic and cardiovascular problems are well studied, much less is known about the impact of obesity on immune function and infectious disease. Studies in obese humans and with obese animal models have repeatedly demonstrated impaired immune function, including decreased cytokine production, decreased response to antigen/mitogen stimulation, reduced macrophage and dendritic cell function, and natural killer cell impairment. Recent studies have demonstrated that the impaired immune response in the obese host leads to increased susceptibility to infection with a number of different pathogens such as community-acquired tuberculosis, influenza, Mycobacterium tuberculosis, coxsackievirus, Helicobacter pylori and encephalomyocarditis virus. While no specific mechanism has been defined for the decreased immune response to infectious disease in the obese host, several obesity-associated changes such as excessive inflammation, altered adipokine signaling, metabolic changes and even epigenetic regulation could affect the immune response. This review will discuss what is currently known about the relationship between obesity and infectious disease.
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Affiliation(s)
- Erik A Karlsson
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN 38105-3678
| | - Melinda A Beck
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599-7461, USA
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265
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Effect of feeding status on adjuvant arthritis severity, cachexia, and insulin sensitivity in male Lewis rats. Mediators Inflamm 2010; 2010. [PMID: 20953376 PMCID: PMC2952917 DOI: 10.1155/2010/398026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Accepted: 09/09/2010] [Indexed: 12/23/2022] Open
Abstract
We studied the effect of food restriction, overfeeding, and normofeeding on cachexia, inflammatory and metabolic parameters, and insulin sensitivity in chronic adjuvant arthritis (AA) in rats. Food restriction during AA increased circulating ghrelin, corticosterone, decreased leptin, and ameliorated arthrogram score and systemic inflammation compared to normofeeding. Overfeeding worsened arthrogram score and systemic inflammation, and led to lipid accumulation in the liver, but not to alterations of adipokine and ghrelin plasma levels relative to normofeeding. Independently of feeding status, AA induced cachexia, in which modulation of mRNA expressions for appetite-regulating neuropeptides (NPY, AgRP, POMC, CART) in the arcuate nucleus (ARC) does not play a primary role. The overexpression of IL-1β mRNA in the ARC suggests its role in the mechanisms of impaired energy balance during AA under all feeding conditions. Normal HOMA index in all arthritic groups does not indicate the development of insulin resistance by feeding interventions in these rats.
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266
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Kangarlou Haghighi A, Davar M, Kazem M, Dianat O. Presence of leptin in chronic periapical lesions. IRANIAN ENDODONTIC JOURNAL 2010; 5:147-50. [PMID: 23130043 PMCID: PMC3471571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2010] [Revised: 08/23/2010] [Accepted: 09/08/2010] [Indexed: 12/03/2022]
Abstract
INTRODUCTION Studies have shown the regulatory role of Leptin in bone formation, its expression in adipose tissue as well as increased levels in circulation following the adminstration of inflammatory stimuli such as lipopolysaccharides (LPS). However, there is little data evaluating the role of Leptin in inflammatory periapical lesions. The aim of this study was to evaluate the presence and concentration of Leptin in chronic periapical lesions. MATERIALS AND METHODS Chronic periapical lesions with different sizes were collected during periapical surgery of the mandibular molars from twenty patients and cultured for 72 hours. The ELISA method determined the concentration of Leptin in supernatant fluids of explants cultures. Statistical analysis was performed using non-parametric tests (Mann-Whitney U, Chi-Square and Spearman's Correlation Coefficient). RESULTS Leptin was found in all samples with the average concentration of 405.55±102.98 (pg/mL). There was no significant correlation between the concentration of Leptin and BMI, and the diameters of lesions. CONCLUSION Leptin can be considered an inflammatory mediator and is likely to have a role during the early phases of dental periapical lesions.
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Affiliation(s)
- Ali Kangarlou Haghighi
- Department of Endodontics, Iranian Center for Endodontic Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Majid Kazem
- Department of Endodontics, Iranian Center for Endodontic Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Omid Dianat
- Department of Endodontics, Iranian Center for Endodontic Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Corresponding author at: Omid Dianat, Department of Endodontic, Dental school, Shahid Beheshti University of medical sciences, Evin, Tehran, Iran. Tel.: +98-2122413897, Fax: +98-2122427753, E-mail:
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