Abstract:
:Angiotensin converting enzyme (ACE) 2 is a carboxypeptidase that shares 42% amino acid homology with ACE. Little is known about the regulation or pattern of expression of ACE2 in the mouse lung, including its definitive cellular distribution or developmental changes. Based on Northern blot and RT-PCR data, we report two distinct transcripts of ACE2 in the mouse lung and kidney and describe a 5' exon 1a previously unidentified in the mouse. Western blots show multiple isoforms of ACE2, with predominance of a 75-80 kDa protein in the mouse lung versus a 120 kDa form in the mouse kidney. Immunohistochemistry localizes ACE2 protein to Clara cells, type II cells, and endothelium and smooth muscle of small and medium vessels in the mouse lung. ACE2 mRNA levels peak at embryonic day 18.5 in the mouse lung, and immunostaining demonstrates protein primarily in the bronchiolar epithelium at that developmental time point. In murine cell lines ACE2 is strongly expressed in the Clara cell line mtCC, as opposed to the low mRNA expression detected in E10 (type I-like alveolar epithelial cell line), MLE-15 (type II alveolar epithelial cell line), MFLM-4 (fetal pulmonary vasculature cell line), and BUMPT-7 (renal proximal tubule cell line). In summary, murine pulmonary ACE2 appears to be primarily epithelial, is developmentally regulated, and has two transcripts that include a previously undescribed exon.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Wiener RS,Cao YX,Hinds A,Ramirez MI,Williams MCdoi
10.1002/jcb.21248subject
Has Abstractpub_date
2007-08-01 00:00:00pages
1278-91issue
5eissn
0730-2312issn
1097-4644journal_volume
101pub_type
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