IMMUNOMODULATORY THERAPIES IN NEONATAL SEPSIS Khalid N. Haque Professor of Neonatal Medicine Neonatal Mortality from Sepsis. 29% of All Neonatal deaths in Asia & Middle East 18% of All Neonatal deaths in North America WHO 2010 Neonatal mortality from sepsis in VLBW infants (consolidated figures from USA,UK and Australia) 0 10 20 30 40 50 60 70 1930 1940 1950 1960 1970 1980 1990 2000 2010 year mortality% 0 10 20 30 40 50 60 70 80 90 0 5 10 15 days mortality% Haque KN: 2002, 2006,2011 85% of infants in UK receive antibiotics at some times during their stay in NICU. Haque KN. J Clinical Excellence 2000, 2; 33-38 60% of NICU patients receive antibiotics in USA. Escobar G. Paediatrics 2003 70% of ICU patients (adults; EPICII study) receive antibiotics. Vincent L. JAMA 2009;302:2323-9) Complication in survivors of neonatal sepsis Odds ratio for CP following neonatal sepsis was 3.6 (2.5 - 9.3). Murphy et al, BMJ 1997 CONS infection remained significant for developing CP after adjusting for birth-weight, seizures, Neonatal ventilation and presentation. Mittendorf et al. Lancet 1999 Neonatal infection was associated with 30-80% increase in odds of Neuro-developmental impairment. 30-100% increase in odds of poor head growth. Culture-negative clinical infection treated for 5 or more days was Associated with a 30% increase in neuro-developmental Impairment. Stoll et al JAMA 2004 Increased incidence of LOS, NEC and early death amongst survivors Kuppala VS et alJ Pediatr 2011 Neuro-developmental impairment in infants with different pathogens versus uninfected infants Category N % NDI (unadjusted) Adjusted OR for NDI relative to uninfected Uninfected 1976 29% - CONS 853 44% 1.3 (1.1 – 1.6) Other Gram positive 256 48% 1.7 (1.2 – 2.3) Gram negative 185 45% 1.8 (1.2 – 7.6) Fungal 96 57% 1.4 (0.9 – 2.2) NEONATAL SEPSIS IS BAD NEWS FOR THE BABY
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IMMUNOMODULATORY THERAPIES IN NEONATAL SEPSIS
Khalid N. Haque Professor of Neonatal Medicine
Neonatal Mortality from Sepsis. 29% of All Neonatal deaths in Asia & Middle East
18% of All Neonatal deaths in North America WHO 2010
Neonatal mortality from sepsis in VLBW infants(consolidated figures from USA,UK and Australia)
0
10
20
30
40
50
60
70
1930 1940 1950 1960 1970 1980 1990 2000 2010
year
mortality%
0102030405060708090
0 5 10 15
days
mortality%
Haque KN: 2002, 2006,2011
85% of infants in UK receive antibiotics at some times during their stay in NICU. Haque KN. J Clinical Excellence 2000, 2; 33-38 60% of NICU patients receive antibiotics in USA. Escobar G. Paediatrics 2003 70% of ICU patients (adults; EPICII study) receive antibiotics. Vincent L. JAMA 2009;302:2323-9)
Complication in survivors of neonatal sepsis
Odds ratio for CP following neonatal sepsis was 3.6 (2.5 - 9.3). Murphy et al, BMJ 1997
CONS infection remained significant for developing CP after adjusting for birth-weight, seizures, Neonatal ventilation and presentation.
Mittendorf et al. Lancet 1999 Neonatal infection was associated with 30-80% increase in odds of Neuro-developmental impairment. 30-100% increase in odds of poor head growth. Culture-negative clinical infection treated for 5 or more days was Associated with a 30% increase in neuro-developmental Impairment. Stoll et al JAMA 2004 Increased incidence of LOS, NEC and early death amongst survivors Kuppala VS et alJ Pediatr 2011
Neuro-developmental impairment in infants with different pathogens versus uninfected infants
• Phagocytic Cells: • Polymorph - Neutrophils B - B Gets tired easily • Macrophage/Monocyte C - B + Often sleepy in class • NK Cells C - A Needs constant stimulation • T Cells D - B + OK at multiplication and
division. Very weak at complex function
• Complement: C B - Trouble getting started • Antibody: C - A Relies entirely on Mother
• Comments: A sensitive child, often picked on by neighbourhood bullies. Needs support, constant attention and may need one to one tutoring.
Adapted from Stiehm: Haque 1990
PAMS
DAMPS
URIC ACIDS
HMGB-1
hsp
Bacterial Lysis
Barriers APP
APRs IL-4, IL-1, IL-6, TNFα APC
T-Cell
Act T-Cell
B-Cell T-Cells NK-Cells Macrophage
Neutrophil macrophage IgG
IgM
IL-2
, IL-
18, T
NF-β,
INF-γ
IL-8, IL-17, IL-18, IL-21, IL-22, G-CSF GM-CSF
TLRs
PRR
complement
Vaso Activation & Coagulopathy
ENDOTH
ELIA
L DAM
AGE
C= Cardiovascular Hypotension H= Haemopoetic DIC, Anaemia Neutropenia A= Apoptosis Metabolic O= Organ Dysfunction Renal, Heart, Liver failure S= Suppression of Immune system
Septic Shock MOD DEATH Haque KN 1995,2005,2010
Macrophage activation and Toxin release lead to an imbalance in immunological homeostasis
Adjuvant Therapies in Neonatal Sepsis; 1 Therapies that DO NOT work
Ø Granulocyte Transfusion No reduction in mortality Ø Low dose steroid therapy No evidence of benefit.
Ø Bacterial Permeability Increasing protein Little experience in newborns.
Ø NO inhibitors No benefit
Ø Monoclonal anti-TNF Harmful
Ø Activated Protein C Not recommended
Ø Oxidative Stress reducing agents: Selenium Worth looking at Melatonin No benefit
Ø Glutamine No benefit
Granuloctye Transfusion: Mortality
Cochrane 2007, Mohan and Brocklehurst
Reduction of Oxidative Stress: Selenium; Glutamine: Selenium deficiency is associated with impairment of both cell-mediated immunity and B-cell function.
Darlow BA, Austin NC; Cochrane 2003
Adjuvant Therapies in Neonatal Sepsis; 2 That Do or May work
+ Colony Stimulating Factors ( G or GM-CSF) Benefit only in neutropenic/IUGR + Pro and Prebiotics Increasing evidence
+ Exchange transfusion Benefit not clear ü Breast Milk Clear benefit ü Lactoferrin Reduction in Late onset sepsis ü Pentoxifylline Benefit in two small RCT’s
Exchange Transfusion Aim is to remove toxic bacterial products and harmful cytokines. Improve haemoglobin, cell numbers, replace clotting factors and provide antibodies. Not well studied as RCT and always used as last resort. Small studies have shown reduction in mortality from 70% to 35% (p=0.07) and from 41% to 27% (p=>.05). Vaine NE et al, Pediatrics 2008 Gunes T et al: Ann Trop Ped 2006
Even he knows that breast-milk is best protection against infection.
BREAST MILK Breast Milk Colostrum and early Breast milk is rich in immune, non-immune and anti-inflammatory components like (Lactoferrin) that accelerate intestinal maturation, resistance to and recovery from infection.
Lactoferrin: An 80 kDa iron-binding glycoprotein Innate Immune Function
Adaptive Immune Function
Acute Insult
Chronic Insult
Epithelial & Damaged Tissue
Infection Inflammation Trauma
Auto-immunity Neurodegenerative disorders
Responding Cells Degranulate
Lactoferrin Promotes Maturation of T-Cell precursors into competent Helper cells & immature B-cells into efficient antigen presenting cells
IL-12
IL-4
IL-10
Th1
Th2
B Cell
Ø
Ø
Ø
Ø
Ø
Ø Ø
Threg
Imm
une
Hom
eost
asis
BIRTH Days to Weeks Intestinal Microbes
BREASTFEEDING Maturation, Differentiation Proliferation of Dendritic CD8/CD4/ Cells
Th1 Th1
Dead Th1 cells
Th2
IL-12
Th2 Bias
Few Dendritic Cells
IL-12R +IL-12
IL-12 induced down regulation of IL-12R on Th1 cells inhibiting IL-4 induced apoptosis
IL-4 induced apoptosis
LACTOFERRIN
Th1 cells ready To fight infection
IL-4
Th0
INTESTINAL/RESPIRATORY EPITHELIUM
LACTOFERRIN (LF)
Adhesion
Type 111 Killing of Enteric Pathogen
Biofilm formation
LF
Enteric bacteria
Invasion
ANOIKIS
Anti-Inflammatory Anti-viral Anti-fungal
LF or Lfcin + lysozyme Killing IgA Secretion Block pathogen from binding to TLR
1. Lactoferrin has a direct iron-dependent bacteriostatic and non-iron-dependent bacteriocidal action on LPS-bearing Gram-negative bacteria.
2. Lactoferrin reduces sepsis induced oxidative stress, altering the magnitude and production of cytokines & apoptosis.
3. Lactoferrin enhances phagocytosis, cell adherence and release of pro-inflammatory cytokines. Actor JK et al 2010
“Effect of the immuno-modulating agent, pentoxifylline, in the treatment of sepsis in prematurely delivered infants: A placebo-controlled, double-
blind trial”.
0
100
200
300
400
500
600
Mortality TNFα(pg/ml) IL-6 (pg/ml)
Pentoxifylline Placebo
Lauterbach, R. Critical Care Med 27(4);1999: 807-814
6% 39%
* P = .009
*
*
0
100
200
300
400
500
600
Mortality Mortality (Kashmir)
Mortality from Septic Shock
Mortality from NEC
TNFα(pg/ml) IL-6 (pg/ml)
* P = .009
Pentoxifylline Control
Pentoxifylline, in the treatment of sepsis Lauterbach, R. Critical Care Med 27(4);1999: 807-814.
Wajid Ali JK et al:Practitioner 2006;13(4):204-207
*
*
6 39
16 40
78
10 8 28
PENTOXIFYLINE: Mortality
Haque KN: Cochrane 2003, 2011
Zinc as adjunct treatment in infants aged between 7 and 120 days with probable serious bacterial infection: a randomised, double-blind, placebo-controlled trial.
N=655
Bhatnagar S et al. Lancet 2012; 379: 2072–78
NNP=15
Zinc improves mucosal barriers, lytic activity of phagocytic and natural killer cells, expression of cytokines, increase CD4 and IL-2 production, activate C3 and phagocytosis.
Dorset farmer Benjamin Jesty successfully vaccinated and induced immunity in his wife and two children with cowpox during a smallpox epidemic in 1774. Lady Mary Wortley Montagu discovered the Ottoman Empire concept of variolation during her stay in Istanbul 1716-1717 and brought the idea back to Britain which was taken up by Edward Jenner 1749-1843
The most reliable evidence for therapy is from Randomised Controlled Trials…
“If you are scanning an article about therapy and it is not a randomised trial, why on earth are you wasting your time?” David Sackett:
Center for Evidence Based Medicine, University of Oxford
Scientific alchemy of the 21st century: Meta-analysis
Feinstein 1999
IVIG in Treatment of Sepsis
Jenson & Pollock 1997 Paediatrics
“UNEQUIVOCAL BENEFIT IN PREVENTING DEATH; SURVIVAL INCREASED NEARLY SIX FOLD”
All Cause Mortality reduced four folds Haque KN. B J Intensive Care 1997; 7(1): 12-17
IVIG in Treatment of Sepsis
“MINIMAL EFFECT”
Lacy & Ohlsson 1998 Cochrane Library
3% reduction in sepsis and a 4% reduction in one or more episodes of any serious infection
Ohlsson, & Lacy, Cochrane Systemic Rev 2003
IVIG in Treatment of Sepsis
“unequivocal benefit in preventing death in adults with sepsis and a trend towards reduction in mortality in the newborn . Aljandera 1999, 2002 Cochrane Library
No reduction in mortality
Aljandera et al, 2010 Cochrane Review
IVIG in the Treatment of Neonatal Sepsis
Treatment with IVIG in cases of subsequently proven infection “resulted in statistically significant reduction in mortality:” NNT 10 (Lacy & Ohlsson, 2010)
Development of Immunoglobulin Preparations 1st Generation: Enzyme Degradation
Initial immune response is mainly IgM however, in the neonate, serum IgM concentrations are 10% of adult values. IgG concentrations depend on gestation. Lower the gestation, lower the IgG levels.
Neonatal B cell Function Two Phase Response to Infection
IgM IgG
Time
Structural Advantage of IgM over IgG * 10 Fab parts for antigen binding * Agglutination is 100 times greater * Complement activation is 400 times greater * Phagocytosis increased 100 folds * Better elimination of bacteria and toxin neutralisation
Döcke, W.D. et al., Int. Care Emerg. Med. 18, 1994 Haque KN. Year book of Intensive Care and Emergency Medicine. In: Vincent JL, Ed. Springer: USA 2007; pp. 55-68.
IgM-ENRICHED IVIG IN TREATMENT OF NEONTAL SEPSIS
25
16.3
6.8
CONT IVIG IgM IVIG
16.7
21.9
3.14.8
ALLINFANTS
<35 WEEKS
Haque 95 Hellwege 99
0.05
0.017
Mortality Mortality Control
IgM-Enriched
%
Intravenous Polyclonal IgM-enriched Immunoglobulin Therapy in Severe Sepsis.
“ Mirror, mirror on the wall, which is the fairest meta-analysis of all?
“ as long as there is no better evidence, the results demonstrated should be sufficient reason to use such a preparation for adjunctive therapy of sepsis or septic shock” ‘That is exactly what I do’. Karl Werdan. Crit Care Med 2007; 35(12):2852-54
“To use or not to use? Polyclonal intravenous immunoglobulins for
the treatment of sepsis and septic shock”. ‘To use or not to use? Considering the available results, the answer must be ivIgG no and iviGAM yes, as long as larger high quality clinical trials are not available’. Edmund A. M Neugebauer. Crit Care Med 2007;35(12):2855
Conclusion Ø Lactoferrin, IgM-Enriched IVIG and Pentoxifylline are the current Immuno-modulators that can be considered as useful adjunctive therapy in neonatal sepsis. Ø In the neonate, any Selenium
deficiency should be promptly corrected. Think also of Zinc.
Being a germ is not easy BUT microbes have been the longest dwellers of this
earth, nothing they do should surprise us. “It’s their world; we only live in it.”
Thank you
Main Reference
Haque KN: Use of Intravenous Immunoglobulin in the Treatment of Neonatal Sepsis: A pragmatic review and analysis. Journal of Medical Sciences 2010, September 2010. William Tarnow-Mordi, David Isaacs, Sourabh Dutta; Adjunctive Immunologic Interventions in Neonatal Sepsis. Clin Perinatol 37 (2010) 481–499