Zinc and Inflammation in Sepsis
The purpose of the proposed project is to investigate measures of zinc status in relation to oxidative stress and inflammation in patients with sepsis. We hypothesise that zinc depletion can modulate inflammatory responses, leading to increased oxidative stress and mitochondrial dysfunction.
Sepsis is a severe infection is the leading cause of death in critically ill patients [1]. Zinc deficiency impairs overall immune function and resistance to infection [2]. In vitro exposure of monocytes to lipopolysaccharide (LPS) leads to decreased cellular zinc content [3] and zinc redistribution has been shown in human volunteers in response to LPS [4]. Zinc depletion occurs in hospitalized patients including those with infections, the elderly, alcoholics, trauma or burns [5-8], conditions which are common among critically ill patients with sepsis. In a mouse model of sepsis, zinc depletion prior to sepsis resulted in more inflammation and more severe organ injury and increased mortality [9]. In patients with sepsis, early feeding with zinc resulted in faster recovery of organ function compared with control [10]. Zinc status is likely to be compromised in the critically ill and that zinc depletion may affect inflammatory responses and recovery.
Although zinc is not an antioxidant itself, it binds to metallothionein [11] and zinc supplementation decreases oxidative stress [12]. Oxidative stress has been consistently reported in patients with sepsis [13-15]. We have recently shown that protection of mitochondrial function with antioxidants can reduce organ damage in rats [16]. Pentraxin-3 is an inflammatory marker which is regulated in part by antioxidants and plays a key role in innate immunity [17].
The consequences of zinc deficiency may relate, in part, to its effects on nuclear factor NFκB, a transcription factor crucial to the signalling networks involved in sepsis [18]. Higher NFκB activity is associated with increased mortality in patients with sepsis [19,20]. It is likely that compromised antioxidant defences and inflammation occurs as a consequence of zinc deficiency.
We propose to measure plasma zinc and metallothionein mRNA status in relation to inflammatory markers including key cytokines, pentraxin-3, markers of oxidative stress and antioxidant status in patients with sepsis.
Panoramica dello studio
Stato
Condizioni
Descrizione dettagliata
Following ethical approval consent will be sought from either the patient, or assent from a near relative. Successive patients admitted to the Intensive Care Unit at Aberdeen Royal Infirmary who fulfil the following criteria for sepsis, given below, within a 24h time window, will be included.
- Clinical suspicion or evidence of acute infection
SIRS defined by two or more of the following:
- Core temperature <36 degrees C or >38 degrees C
- Tachycardia; heart rate > 90 beats/min.
- Tachypnoea; respiratory rate > 20 breaths/min or mechanical ventilation
- White blood count >12 x 109/l or <4 x 109/l
In this pilot study we will recruit 20 patients with sepsis and 20 critically ill patients with no clinical suspicion of sepsis. Patients will be excluded if they are <16 years, pregnant or lactating, HIV positive, receiving corticosteroids or other known immuno-modulatory drugs (including statins), have cancer or autoimmune disorders or if consent/assent is refused.
Blood samples will be obtained on Days 1,2, 5, 10 and 14 of the ICU stay. Peripheral whole blood will be sampled from an indwelling arterial line and plasma will be separated for analysis of plasma zinc using atomic absorption spectroscopy. Plasma interleukin-6 (IL-6) and pentraxin-3 (PTX3) will be measured using enzyme immunoassay and total antioxidant capacity and lipid hydroperoxides will be measured colourimetrically [17]. Peripheral blood mononuclear cells (MNC) will be separated using single density gradient centrifugation, RNA extracted and metallothionein mRNA measured using qPCR [21]. Nuclear extracts of MNC will be prepared and nuclear factor kappa B (NFκB)activation measured using an enzyme immunoassay [17].
Tipo di studio
Iscrizione (Effettivo)
Contatti e Sedi
Luoghi di studio
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Scotland
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Aberdeen, Scotland, Regno Unito, AB41 8TK
- Aberdeen Royal Infirmary
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Criteri di partecipazione
Criteri di ammissibilità
Età idonea allo studio
Accetta volontari sani
Sessi ammissibili allo studio
Metodo di campionamento
Popolazione di studio
Successive patients admitted to the Intensive Care Unit at Aberdeen Royal Infirmary who fulfil the following criteria for sepsis, given below, within a 24h time window.
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Descrizione
Patients with sepsis
Inclusion Criteria:
admitted to ICU with clinical suspicion or evidence of acute infection PLUS two or more of the following:
- Core temperature <36 degrees C or >38 degrees C
- Tachycardia; heart rate > 90 beats/min.
- Tachypnoea; respiratory rate > 20 breaths/min or mechanical ventilation
White blood count >12 x 10 9/l or <4 x 10 9/l
Control patients
- admitted to ICU with no clinical evidence or suspicion of infection
Exclusion Criteria:
- under 16 years old
- pregnant or lactating
- HIV positive
- receiving corticosteroids or other known immuno-modulatory drugs
- treated with statins in the last month
- have cancer
- have autoimmune disorders
- consent/assent is refused
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Modelli osservazionali: Caso di controllo
- Prospettive temporali: Prospettiva
Coorti e interventi
Gruppo / Coorte |
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Sepsi
Pazienti con sepsi
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Control
Patients with no clinical evidence of sepsis, but who are critically ill
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Cosa sta misurando lo studio?
Misure di risultato primarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
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Plasma zinc concentration
Lasso di tempo: 14 days
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Plasma zinc will be measured in patients with sepsis and non-spetic critically ill control patients.
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14 days
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Misure di risultato secondarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
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Interleukin-6
Lasso di tempo: 14 days
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The relationship between IL-6 and plasma zinc
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14 days
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Pentraxin-3
Lasso di tempo: 14 days
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The relationship between PTX-3 and plasma zinc
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14 days
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Plasma lipid peroxide
Lasso di tempo: 14 days
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The relationship between LPO and plasma zinc
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14 days
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Plasma total antioxidant capacity
Lasso di tempo: 14 days
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The relationship between TAC and plasma zinc
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14 days
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Metallothionein mRNA
Lasso di tempo: 14 days
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Change in MTmRNA in mononuclear leucocytes in relation to plasma zinc and inflammatory markers
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14 days
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Nuclear factor kappa B
Lasso di tempo: 14 days
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Change in NFkB in nuclear extracts from mononuclear cells in relation to plasma zinc
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14 days
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Collaboratori e investigatori
Sponsor
Collaboratori
Investigatori
- Investigatore principale: Helen Galley, PhD, University of Aberdeen
- Investigatore principale: Nigel Webster, PhD, University of Aberdeen
Pubblicazioni e link utili
Pubblicazioni generali
- Martin GS, Mannino DM, Eaton S, Moss M. The epidemiology of sepsis in the United States from 1979 through 2000. N Engl J Med. 2003 Apr 17;348(16):1546-54. doi: 10.1056/NEJMoa022139.
- Rink L, Gabriel P. Zinc and the immune system. Proc Nutr Soc. 2000 Nov;59(4):541-52. doi: 10.1017/s0029665100000781.
- Goode HF, Rathbone BJ, Kelleher J, Walker BE. Monocyte zinc and in vitro prostaglandin E2 and interleukin-1 beta production by cultured peripheral blood monocytes in patients with Crohn's disease. Dig Dis Sci. 1991 May;36(5):627-33. doi: 10.1007/BF01297030.
- Gaetke LM, McClain CJ, Talwalkar RT, Shedlofsky SI. Effects of endotoxin on zinc metabolism in human volunteers. Am J Physiol. 1997 Jun;272(6 Pt 1):E952-6. doi: 10.1152/ajpendo.1997.272.6.E952.
- Goode HF, Penn ND, Kelleher J, Walker BE. Evidence of cellular zinc depletion in hospitalized but not in healthy elderly subjects. Age Ageing. 1991 Sep;20(5):345-8. doi: 10.1093/ageing/20.5.345.
- Schmuck A, Roussel AM, Arnaud J, Ducros V, Favier A, Franco A. Analyzed dietary intakes, plasma concentrations of zinc, copper, and selenium, and related antioxidant enzyme activities in hospitalized elderly women. J Am Coll Nutr. 1996 Oct;15(5):462-8. doi: 10.1080/07315724.1996.10718625.
- Goode HF, Kelleher J, Walker BE. The effects of acute infection on indices of zinc status. Clin Nutr. 1991 Feb;10(1):55-9. doi: 10.1016/0261-5614(91)90082-n.
- Berger MM, Cavadini C, Chiolero R, Dirren H. Copper, selenium, and zinc status and balances after major trauma. J Trauma. 1996 Jan;40(1):103-9. doi: 10.1097/00005373-199601000-00019.
- Knoell DL, Julian MW, Bao S, Besecker B, Macre JE, Leikauf GD, DiSilvestro RA, Crouser ED. Zinc deficiency increases organ damage and mortality in a murine model of polymicrobial sepsis. Crit Care Med. 2009 Apr;37(4):1380-8. doi: 10.1097/CCM.0b013e31819cefe4.
- Beale RJ, Sherry T, Lei K, Campbell-Stephen L, McCook J, Smith J, Venetz W, Alteheld B, Stehle P, Schneider H. Early enteral supplementation with key pharmaconutrients improves Sequential Organ Failure Assessment score in critically ill patients with sepsis: outcome of a randomized, controlled, double-blind trial. Crit Care Med. 2008 Jan;36(1):131-44. doi: 10.1097/01.CCM.0000297954.45251.A9.
- Bell SG, Vallee BL. The metallothionein/thionein system: an oxidoreductive metabolic zinc link. Chembiochem. 2009 Jan 5;10(1):55-62. doi: 10.1002/cbic.200800511.
- Prasad AS. Clinical, immunological, anti-inflammatory and antioxidant roles of zinc. Exp Gerontol. 2008 May;43(5):370-7. doi: 10.1016/j.exger.2007.10.013. Epub 2007 Nov 1.
- Goode HF, Cowley HC, Walker BE, Howdle PD, Webster NR. Decreased antioxidant status and increased lipid peroxidation in patients with septic shock and secondary organ dysfunction. Crit Care Med. 1995 Apr;23(4):646-51. doi: 10.1097/00003246-199504000-00011.
- Cowley HC, Bacon PJ, Goode HF, Webster NR, Jones JG, Menon DK. Plasma antioxidant potential in severe sepsis: a comparison of survivors and nonsurvivors. Crit Care Med. 1996 Jul;24(7):1179-83. doi: 10.1097/00003246-199607000-00019.
- Galley HF, Howdle PD, Walker BE, Webster NR. The effects of intravenous antioxidants in patients with septic shock. Free Radic Biol Med. 1997;23(5):768-74. doi: 10.1016/s0891-5849(97)00059-2.
- Lowes DA, Thottakam BM, Webster NR, Murphy MP, Galley HF. The mitochondria-targeted antioxidant MitoQ protects against organ damage in a lipopolysaccharide-peptidoglycan model of sepsis. Free Radic Biol Med. 2008 Dec 1;45(11):1559-65. doi: 10.1016/j.freeradbiomed.2008.09.003. Epub 2008 Sep 17. Erratum In: Free Radic Biol Med. 2009 Oct 1;47(7):1098.
- Hill AL, Lowes DA, Webster NR, Sheth CC, Gow NA, Galley HF. Regulation of pentraxin-3 by antioxidants. Br J Anaesth. 2009 Dec;103(6):833-9. doi: 10.1093/bja/aep298. Epub 2009 Oct 28.
- Otsu K, Ikeda Y, Fujii J. Accumulation of manganese superoxide dismutase under metal-depleted conditions: proposed role for zinc ions in cellular redox balance. Biochem J. 2004 Jan 1;377(Pt 1):241-8. doi: 10.1042/BJ20030935.
- Paterson RL, Galley HF, Dhillon JK, Webster NR. Increased nuclear factor kappa B activation in critically ill patients who die. Crit Care Med. 2000 Apr;28(4):1047-51. doi: 10.1097/00003246-200004000-00022.
- Bohrer H, Qiu F, Zimmermann T, Zhang Y, Jllmer T, Mannel D, Bottiger BW, Stern DM, Waldherr R, Saeger HD, Ziegler R, Bierhaus A, Martin E, Nawroth PP. Role of NFkappaB in the mortality of sepsis. J Clin Invest. 1997 Sep 1;100(5):972-85. doi: 10.1172/JCI119648.
- Kwon CS, Kountouri AM, Mayer C, Gordon MJ, Kwun IS, Beattie JH. Mononuclear cell metallothionein mRNA levels in human subjects with poor zinc nutrition. Br J Nutr. 2007 Feb;97(2):247-54. doi: 10.1017/S0007114507328614.
- Goode HF, Kelleher J, Walker BE. Zinc concentrations in pure populations of peripheral blood neutrophils, lymphocytes and monocytes. Ann Clin Biochem. 1989 Jan;26 ( Pt 1):89-95. doi: 10.1177/000456328902600114.
- Mertens K, Lowes DA, Webster NR, Talib J, Hall L, Davies MJ, Beattie JH, Galley HF. Low zinc and selenium concentrations in sepsis are associated with oxidative damage and inflammation. Br J Anaesth. 2015 Jun;114(6):990-9. doi: 10.1093/bja/aev073. Epub 2015 Mar 31.
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- 11/AL/0137
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