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Manceau H, Puy V, Schmitt CM, Gil S, Lefebvre T, Allaf B, Rosenblatt J, Gouya L, Puy H, Muller F, Peoc'h K. Characterization and origin of heme precursors in amniotic fluid: lessons from normal and pathological pregnancies. Pediatr Res 2018; 84:80-84. [PMID: 29795201 DOI: 10.1038/s41390-018-0011-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 03/21/2018] [Accepted: 03/22/2018] [Indexed: 11/09/2022]
Abstract
BACKGROUND Heme is the prosthetic group of numerous proteins involved in vital processes such as oxygen transport, oxidative stress, and energetic mitochondrial metabolism. Free heme also plays a significant role at early stages of development and in cell differentiation processes. The metabolism of heme by the fetal placenta unit is not well-established in humans. METHODS In a retrospective study, we measured heme precursors in the amniotic fluid (AF) of 51 healthy women, and 10 AF samples from pregnancies with either upper or lower intestinal atresia or ileus were also analyzed. RESULTS We showed that the porphyrin precursors aminolevulinic acid, porphobilinogen, and protoporphyrin IX are present at the limit of detection in the AF. Total porphyrin levels decreased progressively from week 13 to week 33 (p < 0.01). Interestingly, uroporphyrin, initially detected as traces, increased with maturation, in contrast to coproporphyrin. Uro- and coproporphyrins were type I immature isomers (>90%), suggesting a lack of maturity in the fetal compartment of the heme pathway. Finally, the differential analysis of AF from normal and pathological pregnancies demonstrated the predominant hepatic origin of fetal porphyrins excreted in the AF. CONCLUSION This study gives the first insight into heme metabolism in the AF during normal and pathological pregnancies.
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Affiliation(s)
- Hana Manceau
- Biochimie Clinique, Hôpital Beaujon, APHP, HUPNVS, Clichy, France.,UMRs 1149, Centre de Recherche sur l'Inflammation, Institut National de la Santé et de la Recherche Médicale, F-75018, Paris, France
| | - Vincent Puy
- Reproductive Medicine and Medical Cytogenetics Department, Regional University Hospital and School of Medicine, Amiens, France
| | - Caroline M Schmitt
- UMRs 1149, Centre de Recherche sur l'Inflammation, Institut National de la Santé et de la Recherche Médicale, F-75018, Paris, France.,Centre Français des Porphyries, Hôpital Louis Mourier, APHP, HUPNVS, Colombes, France
| | - Sophie Gil
- UMRs1139, UFR des Sciences Pharmaceutiques, Université Paris Descartes, Paris, France
| | - Thibaud Lefebvre
- UMRs 1149, Centre de Recherche sur l'Inflammation, Institut National de la Santé et de la Recherche Médicale, F-75018, Paris, France.,Centre Français des Porphyries, Hôpital Louis Mourier, APHP, HUPNVS, Colombes, France
| | - Bichr Allaf
- Biochimie-Hormonologie, Hôpital Robert Debré, APHP, Paris, France
| | | | - Laurent Gouya
- UMRs 1149, Centre de Recherche sur l'Inflammation, Institut National de la Santé et de la Recherche Médicale, F-75018, Paris, France.,Centre Français des Porphyries, Hôpital Louis Mourier, APHP, HUPNVS, Colombes, France
| | - Hervé Puy
- UMRs 1149, Centre de Recherche sur l'Inflammation, Institut National de la Santé et de la Recherche Médicale, F-75018, Paris, France.,Centre Français des Porphyries, Hôpital Louis Mourier, APHP, HUPNVS, Colombes, France
| | - Francoise Muller
- Biochimie-Hormonologie, Hôpital Robert Debré, APHP, Paris, France
| | - Katell Peoc'h
- Biochimie Clinique, Hôpital Beaujon, APHP, HUPNVS, Clichy, France. .,UMRs1139, UFR des Sciences Pharmaceutiques, Université Paris Descartes, Paris, France.
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