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Sampah MES, Hackam DJ. Dysregulated Mucosal Immunity and Associated Pathogeneses in Preterm Neonates. Front Immunol 2020; 11:899. [PMID: 32499778 PMCID: PMC7243348 DOI: 10.3389/fimmu.2020.00899] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 04/17/2020] [Indexed: 12/12/2022] Open
Abstract
Many functions of the immune system are impaired in neonates, allowing vulnerability to serious bacterial, viral and fungal infections which would otherwise not be pathogenic to mature individuals. This vulnerability is exacerbated in compromised newborns such as premature neonates and those who have undergone surgery or who require care in an intensive care unit. Higher susceptibility of preterm neonates to infections is associated with delayed immune system maturation, with deficiencies present in both the innate and adaptive immune components. Here, we review recent insights into early life immunity, and highlight features associated with compromised newborns, given the challenges of studying neonatal immunity in compromised neonates due to the transient nature of this period of life, and logistical and ethical obstacles posed by undertaking studies newborns and infants. Finally, we highlight how the unique immunological characteristics of the premature host play key roles in the pathogenesis of diseases that are unique to this population, including necrotizing enterocolitis and the associated sequalae of lung and brain injury.
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Affiliation(s)
- Maame Efua S Sampah
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - David J Hackam
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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Matías J, Berzosa M, Pastor Y, Irache JM, Gamazo C. Maternal Vaccination. Immunization of Sows during Pregnancy against ETEC Infections. Vaccines (Basel) 2017; 5:vaccines5040048. [PMID: 29211052 PMCID: PMC5748614 DOI: 10.3390/vaccines5040048] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 11/20/2017] [Accepted: 12/03/2017] [Indexed: 12/18/2022] Open
Abstract
The immunology of pregnancy is an evolving consequence of multiple reciprocal interactions between the maternal and the fetal-placental systems. The immune response must warrant the pregnancy outcome (including tolerance to paternal antigens), but at the same time, efficiently respond to pathogenic challenges. Enterotoxigenic Escherichia coli (ETEC) strains are a major cause of illness and death in neonatal and recently weaned pigs. This review aims to give an overview of the current rationale on the maternal vaccination strategies for the protection of the newborn pig against ETEC. Newborn piglets are immunodeficient and naturally dependent on the maternal immunity transferred by colostrum for protection—a maternal immunity that can be obtained by vaccinating the sow during pregnancy. Our current knowledge of the interactions between the pathogen strategies, virulence factors, and the host immune system is aiding the better design of vaccination strategies in this particular and challenging host status. Challenges include the need for better induction of immunity at the mucosal level with the appropriate use of adjuvants, able to induce the most appropriate and long-lasting protective immune response. These include nanoparticle-based adjuvants for oral immunization. Experiences can be extrapolated to other species, including humans.
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Affiliation(s)
- Jose Matías
- Department of Microbiology, University of Navarra, Instituto de Investigación Sanitaria de Navarra (IDISNA), C/Irunlarrea, 1, 31080 Pamplona, Spain.
| | - Melibea Berzosa
- Department of Microbiology, University of Navarra, Instituto de Investigación Sanitaria de Navarra (IDISNA), C/Irunlarrea, 1, 31080 Pamplona, Spain.
| | - Yadira Pastor
- Department of Microbiology, University of Navarra, Instituto de Investigación Sanitaria de Navarra (IDISNA), C/Irunlarrea, 1, 31080 Pamplona, Spain.
| | - Juan M Irache
- Department of Pharmacy and Pharmaceutical Technology, University of Navarra, Instituto de Investigación Sanitaria de Navarra (IDISNA), C/Irunlarrea, 1, 31080 Pamplona, Spain.
| | - Carlos Gamazo
- Department of Microbiology, University of Navarra, Instituto de Investigación Sanitaria de Navarra (IDISNA), C/Irunlarrea, 1, 31080 Pamplona, Spain.
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Abstract
Necrotizing enterocolitis (NEC) is a devastating disease in premature infants with high case fatality and significant morbidity among survivors. Immaturity of intestinal host defenses predisposes the premature infant gut to injury. An abnormal bacterial colonization pattern with a deficiency of commensal bacteria may lead to a further breakdown of these host defense mechanisms, predisposing the infant to NEC. Here, we review the role of the innate and adaptive immune system in the pathophysiology of NEC.
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MESH Headings
- Adaptive Immunity
- Enterocolitis, Necrotizing/immunology
- Enterocolitis, Necrotizing/microbiology
- Enterocolitis, Necrotizing/physiopathology
- Evidence-Based Medicine
- Humans
- Immunity, Innate
- Infant, Premature
- Infant, Premature, Diseases/immunology
- Infant, Premature, Diseases/microbiology
- Infant, Premature, Diseases/physiopathology
- Intestinal Mucosa/immunology
- Intestinal Mucosa/microbiology
- Intestinal Mucosa/physiopathology
- Intestines/blood supply
- Intestines/immunology
- Intestines/physiopathology
- Milk, Human/immunology
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Affiliation(s)
- Timothy L Denning
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA
| | - Amina M Bhatia
- Department of Surgery, Emory University School of Medicine, Atlanta, GA
| | - Andrea F Kane
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA
| | - Ravi M Patel
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA
| | - Patricia W Denning
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA.
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Trend S, de Jong E, Lloyd ML, Kok CH, Richmond P, Doherty DA, Simmer K, Kakulas F, Strunk T, Currie A. Leukocyte Populations in Human Preterm and Term Breast Milk Identified by Multicolour Flow Cytometry. PLoS One 2015; 10:e0135580. [PMID: 26288195 PMCID: PMC4545889 DOI: 10.1371/journal.pone.0135580] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 07/24/2015] [Indexed: 12/12/2022] Open
Abstract
Background Extremely preterm infants are highly susceptible to bacterial infections but breast milk provides some protection. It is unknown if leukocyte numbers and subsets in milk differ between term and preterm breast milk. This study serially characterised leukocyte populations in breast milk of mothers of preterm and term infants using multicolour flow cytometry methods for extended differential leukocyte counts in blood. Methods Sixty mothers of extremely preterm (<28 weeks gestational age), very preterm (28–31 wk), and moderately preterm (32–36 wk), as well as term (37–41 wk) infants were recruited. Colostrum (d2–5), transitional (d8–12) and mature milk (d26–30) samples were collected, cells isolated, and leukocyte subsets analysed using flow cytometry. Results The major CD45+ leukocyte populations circulating in blood were also detectable in breast milk but at different frequencies. Progression of lactation was associated with decreasing CD45+ leukocyte concentration, as well as increases in the relative frequencies of neutrophils and immature granulocytes, and decreases in the relative frequencies of eosinophils, myeloid and B cell precursors, and CD16- monocytes. No differences were observed between preterm and term breast milk in leukocyte concentration, though minor differences between preterm groups in some leukocyte frequencies were observed. Conclusions Flow cytometry is a useful tool to identify and quantify leukocyte subsets in breast milk. The stage of lactation is associated with major changes in milk leukocyte composition in this population. Fresh preterm breast milk is not deficient in leukocytes, but shorter gestation may be associated with minor differences in leukocyte subset frequencies in preterm compared to term breast milk.
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Affiliation(s)
- Stephanie Trend
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- School of Paediatrics and Child Health, The University of Western Australia, Perth, Western Australia, Australia
| | - Emma de Jong
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- School of Paediatrics and Child Health, The University of Western Australia, Perth, Western Australia, Australia
- School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
| | - Megan L. Lloyd
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- School of Pathology and Laboratory Medicine, The University of Western Australia, Perth, Western Australia, Australia
| | - Chooi Heen Kok
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- Neonatal Clinical Care Unit, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
| | - Peter Richmond
- School of Paediatrics and Child Health, The University of Western Australia, Perth, Western Australia, Australia
| | - Dorota A. Doherty
- School of Women’s and Infants’ Health, The University of Western Australia, Perth, Western Australia, Australia
| | - Karen Simmer
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- Neonatal Clinical Care Unit, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
| | - Foteini Kakulas
- School of Chemistry and Biochemistry, The University of Western Australia, Perth, Australia
| | - Tobias Strunk
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- Neonatal Clinical Care Unit, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
| | - Andrew Currie
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
- School of Paediatrics and Child Health, The University of Western Australia, Perth, Western Australia, Australia
- School of Veterinary and Life Sciences, Murdoch University, Perth, Western Australia, Australia
- * E-mail:
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Abstract
The gastrointestinal (GI) tract is a large potential portal for multiple infectious agents to enter the human body. The GI system performs multiple functions as part of the neonate's innate immune system, providing critical defense during a vulnerable period. Multiple mechanisms and actions are enhanced by the presence of human breast milk. Bioactive factors found in human milk work together to create and maintain an optimal and healthy environment, allowing the intestines to deliver ideal nutrition to the host and afford protection by a variety of mechanisms.
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Affiliation(s)
- Brett M Jakaitis
- Division of Neonatology, Department of Pediatrics, Emory University School of Medicine, 2015 Uppergate Drive, 3rd Floor, Atlanta, GA 30322, USA
| | - Patricia W Denning
- Division of Neonatology, Department of Pediatrics, Emory University School of Medicine, 2015 Uppergate Drive, 3rd Floor, Atlanta, GA 30322, USA.
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Abstract
Breast-feeding provides protection against infections and contains numerous factors that modulate and promote the development of the infant immune system. These factors include secretory IgA, antimicrobial proteins like CD14, cytokines, and fatty acids. Studies examining the role of breast-feeding in the development of allergic disease in infants demonstrate potentially protective as well as neutral or nonprotective effects, likely due to the heterogeneity in their study design. In this overview, we explore the potential role of immune factors in the breast milk, as well as selected probiotics, in the development of allergy.
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Breast milk as the gold standard for protective nutrients. J Pediatr 2010; 156:S3-7. [PMID: 20105662 DOI: 10.1016/j.jpeds.2009.11.021] [Citation(s) in RCA: 296] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 09/01/2009] [Accepted: 10/15/2009] [Indexed: 02/07/2023]
Abstract
In this introductory overview, I explore the observation that breast milk is the gold standard for protective nutrients fed to newborn infants and present clinical evidence of its strong protective effect against age-related infectious gastroenteritis. The composition of breast milk changes according to the newborn infant's needs for passive protection. In addition, substances in breast milk can actively stimulate development of the newborn's host defenses to provide continued mucosal protection after breastfeeding is terminated. Later I present several specific examples of the development of intestinal host defenses due to breastfeeding. An important function of early breastfeeding is its anti-inflammatory effect on the immature, excessive inflammatory response in newborns. Several components of breast milk can reduce the inflammatory response to stimuli in the newborn intestine. These include transforming growth factor (TGF)-beta, interleukin (IL)-10, erythropoietin, and lactoferrin. These components of breast milk can act individually or in concert to contain the neonatal immature anti-inflammatory response.
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