title: Gene expression profile in flow-associated pulmonary arterial hypertension with neointimal lesions.
abstract: Pulmonary arterial hypertension (PAH) is a pulmonary angioproliferative disease with high morbidity and mortality, characterized by a typical pattern of pulmonary vascular remodeling including neointimal lesions. In congenital heart disease, increased pulmonary blood flow has appeared to be a key mediator in the development of these characteristic lesions, but the molecular mechanisms underlying the pulmonary vascular lesions are largely unknown. We employed a rat model of flow-associated PAH, which induced specific pulmonary neointimal lesions. We identified gene expression profiles in rats specifically related to the addition of increased pulmonary blood flow to monocrotaline and the associated occurrence of neointimal lesions. Increased pulmonary blood flow induced the expression of the transcription factors activating transcription factor-3 (ATF3) and early growth response factor-1 (EGR-1), for which presence was confirmed in neointimal lesions. Monocrotaline alone induced increased numbers of activated mast cells and their products. We further identified molecular pathways that may be involved in treatment with the prostacyclin analog iloprost, a vasoactive compound with clinically beneficial effects in patients with PAH, which were similar to pathways described in samples from patient studies. These pathways, associated with the development of angioproliferative lesions as well as with the response to therapy in PAH, may provide new therapeutic targets.
authors.affiliation: Center for Congenital Heart Disease, Beatrix Children's Hospital, Groningen, The Netherlands.
authors.forename: Mirjam E
authors.initials: ME
authors.lastname: van Albada
authors.forename: Beatrijs
authors.initials: B
authors.lastname: Bartelds
authors.forename: Hans
authors.initials: H
authors.lastname: Wijnberg
authors.forename: Saffloer
authors.initials: S
authors.lastname: Mohaupt
authors.forename: Michael G
authors.initials: MG
authors.lastname: Dickinson
authors.forename: Regien G
authors.initials: RG
authors.lastname: Schoemaker
authors.forename: Krista
authors.initials: K
authors.lastname: Kooi
authors.forename: Frans
authors.initials: F
authors.lastname: Gerbens
authors.forename: Rolf M F
authors.initials: RM
authors.lastname: Berger
mesh_terms: D000818:Animals; D002452:Cell Count; D016000:Cluster Analysis; D004195:Disease Models, Animal; D020869:Gene Expression Profiling; D006439:Hemodynamics; D006976:Hypertension, Pulmonary / Q000235:genetics* / Q000503:physiopathology*; D008297:Male; D008407:Mast Cells / Q000166:cytology / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D011651:Pulmonary Artery / Q000473:pathology* / Q000503:physiopathology*; D051381:Rats; D017208:Rats, Wistar; D012039:Regional Blood Flow / Q000502:physiology*; D014157:Transcription Factors / Q000378:metabolism; D017539:Tunica Intima / Q000473:pathology* / Q000503:physiopathology
chemical_list: D014157:Transcription Factors