Meta-analyses of clinical studies over the past 30 years have confirmed Ureaplasma respiratory colonization as an independent risk factor for bronchopulmonary dysplasia (BPD). This application addresses the fundamental problem that there is currently insufficient data concerning the benefit/risk ratio of antibiotic therapy to recommend treatment guidelines to prevent BPD and long-term adverse pulmonary outcomes in preterm infants at-risk or with confirmed Ureaplasma infection. Our long- term objective is to develop therapies to eradicate Ureaplasma from the respiratory tract of preterm infants and prevent or ameliorate Ureaplasma-mediated lung injury. The azalide antibiotic azithromcyin (AZM) has antimicrobial and immunomodulatory properties that make it an ideal therapeutic candidate to prevent Ureaplasma-mediated lung injury. We conducted PK/PD studies characterizing the population PK, safety, tolerability, and biologic effects of a single dose of 10 and 20 mg/kg IV AZM and multiple dose 20 mg/kg x 3d in 24-28 wk gestation neonates who are at highest risk for Ureaplasma respiratory tract colonization and BPD. A 2-compartment model with all parameters allometrically scaled on body weight best described the PK of AZM in preterm neonates. Compared to the single dose groups, the 20 mg/kg multi-dose effectively eradicated Ureaplasma in all subjects who were colonized pre-dose. The multi-dose regimen appeared safe, with no deaths or serious adverse events attributed to the drug. Our objectives in this application are to determine the safety and microbiological efficacy of a short course of IV AZM to eradicate respiratory tract Ureaplasma infection and its' potential to improve short-term (BPD) and long-term pulmonary and neurodevelopmental outcomes in preterm neonates. The central hypothesis is that AZM therapy will reduce pulmonary morbidity in Ureaplasma-infected preterm infants by accelerating pathogen clearance and/or down-regulating the pulmonary inflammatory response. We have completed 80% planned enrollment in the current multicenter, randomized, double-blind, placebo-controlled Phase IIb clinical trial of 20 mg/kg x3d IV AZM.
The specific aims of this renewal application will extend outcomes up to 24 months adjusted age and will address the next steps preparatory to Phase III safety and efficacy trials of AZM in the preterm population.
The specific aims of this proposal are: 1) to determine the safety and microbiological efficacy of IV AZM to eradicate respiratory tract Ureaplasma infection in preterm neonates; 2) to analyze the potential of AZM to reduce BPD and improve long-term pulmonary outcomes; and 3) to assess the impact of AZM on the risk for neurodevelopmental impairment at 22-26 months adjusted age. The proposed research is significant because it will lead directly to decisions concerning future Phase III safety and efficacy trials of AZM in the preterm population and to evidence-based recommendations concerning the clinical evaluation and management of perinatally-acquired Ureaplasma respiratory colonization in the preterm population.

Public Health Relevance

/RELEVANCE: The proposed research is relevant to public health because the proposed well-designed studies will establish the safety and microbiologic efficacy of azithromycin to eradicate perinatally-acquired Ureaplasma respiratory colonization, and the demonstrate the potential of this therapy to improve pulmonary and neurodevelopmental outcomes of infants born extremely preterm. Thus, the proposed research is relevant to the NICHD mission to ensure that all children have the chance to achieve their full potential for healthy and productive lives, free from disease or disability and supports the goal of the Better Pharmaceuticals fro Children Act (BPCA) Program to improve pediatric therapeutics through preclinical and clinical drug trials that lead to drug labeling changes.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Research Project (R01)
Project #
5R01HD067126-07
Application #
9521580
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Ren, Zhaoxia
Project Start
2011-03-10
Project End
2020-06-30
Budget Start
2018-07-01
Budget End
2019-06-30
Support Year
7
Fiscal Year
2018
Total Cost
Indirect Cost
Name
University of Maryland Baltimore
Department
Pediatrics
Type
Schools of Medicine
DUNS #
188435911
City
Baltimore
State
MD
Country
United States
Zip Code
21201
Balena-Borneman, Jessica; Ambalavanan, Namasivayam; Tiwari, Hemant K et al. (2017) Biomarkers associated with bronchopulmonary dysplasia/mortality in premature infants. Pediatr Res 81:519-525
Askenazi, David; Saeidi, Behtash; Koralkar, Rajesh et al. (2016) Acute changes in fluid status affect the incidence, associative clinical outcomes, and urine biomarker performance in premature infants with acute kidney injury. Pediatr Nephrol 31:843-51
Ambalavanan, N; Aschner, J L (2016) Management of hypoxemic respiratory failure and pulmonary hypertension in preterm infants. J Perinatol 36 Suppl 2:S20-7
Aschner, J L; Gien, J; Ambalavanan, N et al. (2016) Challenges, priorities and novel therapies for hypoxemic respiratory failure and pulmonary hypertension in the neonate. J Perinatol 36 Suppl 2:S32-6
Askenazi, David J; Koralkar, Rajesh; Patil, Neha et al. (2016) Acute Kidney Injury Urine Biomarkers in Very Low-Birth-Weight Infants. Clin J Am Soc Nephrol 11:1527-35
Saeidi, Behtash; Koralkar, Rajesh; Griffin, Russell L et al. (2015) Impact of gestational age, sex, and postnatal age on urine biomarkers in premature neonates. Pediatr Nephrol 30:2037-44
Merchan, L Marcela; Hassan, Hazem E; Terrin, Michael L et al. (2015) Pharmacokinetics, microbial response, and pulmonary outcomes of multidose intravenous azithromycin in preterm infants at risk for Ureaplasma respiratory colonization. Antimicrob Agents Chemother 59:570-8
Lal, Charitharth Vivek; Ambalavanan, Namasivayam (2015) Genetic predisposition to bronchopulmonary dysplasia. Semin Perinatol 39:584-91
Askenazi, David; Patil, Neha R; Ambalavanan, Namasivayam et al. (2015) Acute kidney injury is associated with bronchopulmonary dysplasia/mortality in premature infants. Pediatr Nephrol 30:1511-8
Lal, Charitharth Vivek; Ambalavanan, Namasivayam (2015) Biomarkers, Early Diagnosis, and Clinical Predictors of Bronchopulmonary Dysplasia. Clin Perinatol 42:739-54

Showing the most recent 10 out of 13 publications