L-citrulline attenuates arrested alveolar growth and pulmonary hypertension in oxygen-induced lung injury in newborn rats

Arul Vadivel, Judy L. Aschner, Gloria J. Rey-Parra, Jordan Magarik, Heng Zeng, Marshall Summar, Farah Eaton, Bernard Thébaud

Research output: Contribution to journalArticle

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Abstract

Bronchopulmonary dysplasia (BPD) is characterized by arrested alveolar development and complicated by pulmonary hypertension (PH). NO promotes alveolar growth. Inhaled NO (iNO) ameliorates the BPD phenotype in experimental models and in some premature infants. Arginosuccinate synthetase (ASS) and arginosuccinate lyase (ASL) convert l-citrulline to l-arginine; l-citrulline is regenerated during NO synthesis from l-arginine. Plasma levels of these NO precursors are low in PH. We hypothesized that l-citrulline prevents experimental O 2-induced BPD in newborn rats. Rat pups were assigned from birth through postnatal day (P) 14 to room air (RA), RA + l-citrulline, 95% hyperoxia (BPD model), and 95%O2 + l-citrulline. Rat pups exposed to hyperoxia had fewer and enlarged air spaces and decreased capillary density, mimicking human BPD. This was associated with decreased plasma l-arginine and l-citrulline concentrations on P7. l-Citrulline treatment significantly increased plasma l-arginine and l-citrulline concentrations and increased ASL protein expression in hyperoxia. l-Citrulline preserved alveolar and vascular growth in O 2-exposed pups and decreased pulmonary arterial medial wall thickness (MWT) and right ventricular hypertrophy (RVH). Increased lung arginase (ARG) activity in O 2-exposed pups was reversed by l-citrulline treatment. l-Citrulline supplementation prevents hyperoxia-induced lung injury and PH in newborn rats. l-Citrulline may represent a novel therapeutic alternative to iNO for prevention of BPD.

Original languageEnglish (US)
Pages (from-to)519-525
Number of pages7
JournalPediatric Research
Volume68
Issue number6
DOIs
StatePublished - Dec 2010
Externally publishedYes

Fingerprint

Citrulline
Lung Injury
Pulmonary Hypertension
Oxygen
Bronchopulmonary Dysplasia
Growth
Hyperoxia
Arginine
Lyases
Air
Right Ventricular Hypertrophy
Arginase
Lung
Ligases
Premature Infants
Blood Vessels
Theoretical Models
Therapeutics

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Vadivel, A., Aschner, J. L., Rey-Parra, G. J., Magarik, J., Zeng, H., Summar, M., ... Thébaud, B. (2010). L-citrulline attenuates arrested alveolar growth and pulmonary hypertension in oxygen-induced lung injury in newborn rats. Pediatric Research, 68(6), 519-525. https://doi.org/10.1203/PDR.0b013e3181f90278

L-citrulline attenuates arrested alveolar growth and pulmonary hypertension in oxygen-induced lung injury in newborn rats. / Vadivel, Arul; Aschner, Judy L.; Rey-Parra, Gloria J.; Magarik, Jordan; Zeng, Heng; Summar, Marshall; Eaton, Farah; Thébaud, Bernard.

In: Pediatric Research, Vol. 68, No. 6, 12.2010, p. 519-525.

Research output: Contribution to journalArticle

Vadivel, A, Aschner, JL, Rey-Parra, GJ, Magarik, J, Zeng, H, Summar, M, Eaton, F & Thébaud, B 2010, 'L-citrulline attenuates arrested alveolar growth and pulmonary hypertension in oxygen-induced lung injury in newborn rats', Pediatric Research, vol. 68, no. 6, pp. 519-525. https://doi.org/10.1203/PDR.0b013e3181f90278
Vadivel, Arul ; Aschner, Judy L. ; Rey-Parra, Gloria J. ; Magarik, Jordan ; Zeng, Heng ; Summar, Marshall ; Eaton, Farah ; Thébaud, Bernard. / L-citrulline attenuates arrested alveolar growth and pulmonary hypertension in oxygen-induced lung injury in newborn rats. In: Pediatric Research. 2010 ; Vol. 68, No. 6. pp. 519-525.
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