Temporal/spatial expression of retinoid binding proteins and RAR isoforms in the postnatal lung.
Endogenous retinoids have been implicated in alveologenesis in both the rat and the mouse, and exogenous retinoic acid (RA) can reverse or partially reverse experimental emphysema in adult rat and mouse models by an unknown mechanism. In this study, we examine the cellular and molecular biology of retinoid signaling during alveologenesis in the mouse. We describe the temporal and spatial expression of the retinoid binding proteins CRBP-I, CRBP-II, and CRABP-I using RT-PCR and immunohistochemistry. We identify the retinoic acid receptor isoforms RAR-alpha 1, RAR-beta 2, RAR-beta 4, and RAR-gamma 2 and describe their temporal and spatial expression using RT-PCR and in situ hybridization. We demonstrate that both retinoid binding proteins and RAR isoforms are temporally regulated and found within the alveolar septal regions during alveologenesis. These data support a role of dynamic endogenous RA signaling during alveolar formation.
Hind
Matthew
M
Medical Research Council Centre for Developmental Neurobiology, King's College London, London SE1 9RT, United Kingdom. matthew.hind@kcl.ac.uk
Corcoran
Jonathan
J
Maden
Malcolm
M
D000375:Aging / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development* / Q000378:metabolism*; D005260:Female; D017403:In Situ Hybridization; D008168:Lung / Q000254:growth & development* / Q000378:metabolism*; D008297:Male; D051379:Mice; D020033:Protein Isoforms / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D018168:Receptors, Retinoic Acid / Q000235:genetics / Q000378:metabolism*; D012177:Retinol-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D054840:Retinol-Binding Proteins, Cellular; D013997:Time Factors; D014018:Tissue Distribution
D020033:Protein Isoforms; D012333:RNA, Messenger; C518458:Rbp1 protein, rat; D018168:Receptors, Retinoic Acid; D012177:Retinol-Binding Proteins; D054840:Retinol-Binding Proteins, Cellular