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.
調査の概要
状態
条件
詳細な説明
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].
研究の種類
入学 (実際)
連絡先と場所
研究場所
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Scotland
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Aberdeen、Scotland、イギリス、AB41 8TK
- Aberdeen Royal Infirmary
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
サンプリング方法
調査対象母集団
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.
• .
説明
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
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 観測モデル：ケースコントロール
- 時間の展望：見込みのある
コホートと介入
グループ/コホート |
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敗血症
敗血症患者
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Control
Patients with no clinical evidence of sepsis, but who are critically ill
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Plasma zinc concentration
時間枠：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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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Interleukin-6
時間枠：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
時間枠：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
時間枠：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
時間枠：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
時間枠：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
時間枠：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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協力者と研究者
スポンサー
捜査官
- 主任研究者：Helen Galley, PhD、University of Aberdeen
- 主任研究者：Nigel Webster, PhD、University of Aberdeen
出版物と役立つリンク
一般刊行物
- 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.
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
研究の完了 (実際)
試験登録日
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QC基準を満たした最初の提出物
最初の投稿 (見積もり)
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投稿された最後の更新 (見積もり)
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