1
|
Kambouchner M, Emile JF, Copin MC, Coulomb-Lherminé A, Sabourin JC, Della Valle V, Sileo C, Ducou Le Pointe H, Bégueret H, Galmiche L, Lambilliotte A, Paraf F, Piche M, Piguet C, Rullier A, Secq V, Serre I, Bernaudin JF, Donadieu J. Childhood pulmonary Langerhans cell histiocytosis: a comprehensive clinical-histopathological and BRAF V600E mutation study from the French national cohort. Hum Pathol 2019; 89:51-61. [PMID: 31054893 DOI: 10.1016/j.humpath.2019.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 04/24/2019] [Accepted: 04/25/2019] [Indexed: 01/08/2023]
Abstract
Childhood pulmonary Langerhans cell histiocytosis (PLCH) is a rare disease. Its pulmonary histopathology, according to comprehensive clinical-radiological findings and BRAFV600E mutation status, has not yet been thoroughly documented. From the 167 childhood PLCH cases entered in the French National Histiocytosis Registry (1983-2016), we retrieved lung biopsies from a consecutive retrospective series of 17 patients, diagnosed when they were 2 weeks to 16 years old (median, 9.4 years), and report the clinical and histopathological findings herein. Histological analyses of biopsies (16 surgical and 1 postmortem) found the following features, alone or associated: Langerhans cell (LC) nodules with cavitation (9/17), cysts (14/17), fibrotic scars (2/17), peribronchiolar topographic distribution of the lesions (10/17), and accessory changes, like stretch emphysema (7/17). Those characteristics closely resemble those describing adult PLCH. However, unusual findings observed were 2 large nodules and a diffuse interstitial LC infiltrate. BRAFV600E mutation was detected in 4 of 12 samples tested, notably in the 3 with unusual features. In conclusion, childhood PLCH mostly shares the common histology features already described in adult PLCH, regardless of age. Because smoking is considered the major trigger in PLCH pathogenesis, the findings based on this series suggest other inducers of bronchiolar LC recruitment, especially in very young patients.
Collapse
Affiliation(s)
- Marianne Kambouchner
- Pathology Department, APHP, Centre Hospitalier Universitaire (CHU) Avicenne, 93000 Bobigny, France.
| | - Jean-François Emile
- Pathology Department, APHP, CHU Ambroise-Paré, 92104 Boulogne-Billancourt, France
| | | | | | | | | | - Chiara Sileo
- Radiology Department, APHP, CHU Armand-Trousseau, 75012 Paris, France
| | | | - Hugues Bégueret
- Pathology Department, CHU de Bordeaux Haut-Lévêque, 33600 Pessac, France
| | - Louise Galmiche
- Pathology Department, APHP, CHU Necker-Enfants Malades, 75015 Paris, France
| | - Anne Lambilliotte
- Pediatric Hemato-Oncology Department, CHU Jeanne-de-Flandre, 59120 Lille, France
| | - François Paraf
- Pathology Department, CHU Dupuytren, 87000 Limoges, France
| | | | | | - Anne Rullier
- Pathology Department, CHU de Bordeaux Pellegrin, 33000 Bordeaux, France
| | - Véronique Secq
- Pathology Department, CHU La Timone, 13385 Marseille, France
| | - Isabelle Serre
- Pathology Department, CHU Gui-de-Chauliac, 34295 Montpellier, France
| | | | - Jean Donadieu
- Pediatric Hemato-Oncology Department and French Referent Centre for Histiocytoses, APHP, CHU Armand-Trousseau, 75012 Paris, France
| |
Collapse
|
3
|
Merad M, Ginhoux F, Collin M. Origin, homeostasis and function of Langerhans cells and other langerin-expressing dendritic cells. Nat Rev Immunol 2008; 8:935-47. [PMID: 19029989 DOI: 10.1038/nri2455] [Citation(s) in RCA: 576] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Langerhans cells (LCs) are a specialized subset of dendritic cells (DCs) that populate the epidermal layer of the skin. Langerin is a lectin that serves as a valuable marker for LCs in mice and humans. In recent years, new mouse models have led to the identification of other langerin(+) DC subsets that are not present in the epidermis, including a subset of DCs that is found in most non-lymphoid tissues. In this Review we describe new developments in the understanding of the biology of LCs and other langerin(+) DCs and discuss the challenges that remain in identifying the role of different DC subsets in tissue immunity.
Collapse
Affiliation(s)
- Miriam Merad
- Department of Gene and Cell Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA.
| | | | | |
Collapse
|