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Simonato M, Ricci F, Catozzi C, Storti M, Correani A, Salomone F, Cogo P, Carnielli VP. A novel deuterium-based model for measurement of exogenous surfactant using deuterium-depleted water. Pediatr Pulmonol 2022; 57:2808-2814. [PMID: 35938216 DOI: 10.1002/ppul.26104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 07/29/2022] [Accepted: 08/03/2022] [Indexed: 11/11/2022]
Abstract
Stable isotope tracers, like 13 C, can be used for the measurement of the partition between the endogenous and exogenous pulmonary disaturated-phosphatidylcholine (DSPC). Deuterium labeling methods are still not fully explored. Our aim was to investigate the feasibility of using deuterium-depleted water (DDW) and deuterium-enriched water (DEW) to measure endogenous and exogenous pulmonary DSPC in a rabbit model of surfactant depletion. Data obtained from the 13 C dilution method were used as a reference. We studied 9 adult rabbits: 4 drank DDW and 5 DEW for 5 days. Lung surfactant depletion was induced at Day 5 by repeated saline bronchoalveolar lavages (BAL), which were stored as a pool (BAL pool). After endogenous surfactant depletion, rabbits received exogenous surfactant followed by a second BAL depletion procedure (End-Experiment Pool). DSPC quantity, and palmitic acid (PA)-DSPC 2 H/1 H (δ2 H) and 13 C/12 C ratios (δ13 C) of exogenous surfactant batches and of BAL pools were measured by High-Resolution Mass Spectrometry. The amount of exogenous surfactant recovered from the lungs ranged from 45% to 81% and, it was highly correlated with those obtained with the use of the 13 C (r = 0.9844, p < 0.0001). We demonstrated that commercially available purified DDW and even low doses of DEW can be used to modify the deuterium background of endogenous surfactants with the purpose of measuring the contribution of exogenous surfactants to the endogenous alveolar surfactant pool.
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Affiliation(s)
- Manuela Simonato
- PCare laboratory, Department of Women's and Children's Health, University of Padova, Padova, Italy.,Fondazione Istituto di Ricerca Pediatrica, "Citta' della Speranza", Padova, Italy
| | - Francesca Ricci
- Pharmacology & Toxicology Department, Neonatology and Pulmonary Rare Disease Unit, Corporate Preclinical R&D, Parma, Chiesi, Italy
| | - Chiara Catozzi
- Pharmacology & Toxicology Department, Neonatology and Pulmonary Rare Disease Unit, Corporate Preclinical R&D, Parma, Chiesi, Italy
| | - Matteo Storti
- Department of Chemical & Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy
| | - Alessio Correani
- Division of Neonatology, Polytechnic University of Marche and "G. Salesi" Children's Hospital, Ancona, Italy
| | - Fabrizio Salomone
- Pharmacology & Toxicology Department, Neonatology and Pulmonary Rare Disease Unit, Corporate Preclinical R&D, Parma, Chiesi, Italy
| | - Paola Cogo
- Department of Medicine, University Hospital S Maria della Misericordia, University of Udine, Udine, Italy
| | - Virgilio P Carnielli
- Division of Neonatology, Polytechnic University of Marche and "G. Salesi" Children's Hospital, Ancona, Italy
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Giambelluca S, Ricci F, Simonato M, Vedovelli L, Traldi U, Correani A, Casiraghi C, Storti M, Mersanne A, Cogo P, Salomone F, Carnielli VP. Tracing exogenous surfactant in vivo in rabbits by the natural variation of 13C. Respir Res 2019; 20:158. [PMID: 31319861 PMCID: PMC6637643 DOI: 10.1186/s12931-019-1124-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 07/03/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Respiratory Distress Syndrome (RDS) is a prematurity-related breathing disorder caused by a quantitative deficiency of pulmonary surfactant. Surfactant replacement therapy is effective for RDS newborns, although treatment failure has been reported. The aim of this study is to trace exogenous surfactant by 13C variation and estimate the amount reaching the lungs at different doses of the drug. METHODS Forty-four surfactant-depleted rabbits were obtained by serial bronchoalveolar lavages (BALs), that were merged into a pool (BAL pool) for each animal. Rabbits were in nasal continuous positive airway pressure and treated with 0, 25, 50, 100 or 200 mg/kg of poractant alfa by InSurE. After 90 min, rabbits were depleted again and a new pool (BAL end experiment) was collected. Disaturated-phosphatidylcholine (DSPC) was measured by gas chromatography. DSPC-Palmitic acid (PA) 13C/12C was analyzed by isotope ratio mass spectrometry. One-way non-parametric ANOVA and post-hoc Dunn's multiple comparison were used to assess differences among experimental groups. RESULTS Based on DSPC-PA 13C/12C in BAL pool and BAL end experiment, the estimated amount of exogenous surfactant ranged from 61 to 87% in dose-dependent way (p < 0.0001) in animals treated with 25 up to 200 mg/kg. Surfactant administration stimulated endogenous surfactant secretion. The percentage of drug recovered from lungs did not depend on the administered dose and accounted for 31% [24-40] of dose. CONCLUSIONS We reported a risk-free method to trace exogenous surfactant in vivo. It could be a valuable tool for assessing, alongside the physiological response, the delivery efficiency of surfactant administration techniques.
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Affiliation(s)
- Sonia Giambelluca
- Department of Women's and Children's Health, University of Padova, Padova, Italy.,PCare Laboratory, Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti, 4F, Padova, 35121, Italy
| | | | - Manuela Simonato
- PCare Laboratory, Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti, 4F, Padova, 35121, Italy. .,Institute of Anesthesiology and Intensive Care, Department of Medicine - DIMED, University of Padova, Padova, Italy.
| | - Luca Vedovelli
- PCare Laboratory, Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Corso Stati Uniti, 4F, Padova, 35121, Italy
| | | | - Alessio Correani
- Division of Neonatology, Department of Clinical Sciences, Polytechnic University of Marche and Azienda Ospedaliero-Universitaria Ospedali Riuniti, Ancona, Italy
| | | | | | | | - Paola Cogo
- Department of Medicine, University of Udine, Udine, Italy
| | | | - Virgilio P Carnielli
- Division of Neonatology, Department of Clinical Sciences, Polytechnic University of Marche and Azienda Ospedaliero-Universitaria Ospedali Riuniti, Ancona, Italy
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