Circadian rhythm of surfactant protein A, B and C mRNA in rats / 대한내과학회지
Korean Journal of Medicine
;
: 547-554, 2001.
Article
in Korean
| WPRIM
| ID: wpr-158613
ABSTRACT
BACKGROUND:
All organisms have developed an internal timing system capable of reacting to and anticipating environmental stimuli with a program of appropriately timed metabolic, physiologic, and behavioral events. The alveolar epithelial type II cell of mammalian lung synthesizes, stores, and secretes a lipoprotein pulmonary surfactant, which functions to stabilize alveoli at low lung volumes.METHODS:
The authors investigated the diurnal variation of surfactant protein A, B and C mRNA accumulation. The diurnal variation on gene expression of surfactant protein A, B and C were analysed using filter hybridization at 9 AM, 4 PM and 11 PM. Lung SP-A protein content was determined by double sandwich ELISA assay using a polyclonal antiserum raised in rabbits against purified rat SP-A.RESULTS:
1. The accumulation of SP-A mRNA at 4 PM was significantly decreased 23.5% compared to the value at 9 AM (p<0.05). 2. The accumulation of SP-B mRNA at 4 PM and 11 PM was decreased by 15.1% and 5.7%, respectively, compared to the value at 9 AM (p=0.07, p=0.69). 3. The accumulation of SP-C mRNA at 4 PM and 11 PM was decreased by 6.8% and 7.7%, respectively, compared to the value at 9 AM (p=0.38, p=0.57). 4. Total lung SP-A content at 4 PM and 11 PM was increased by 5.3% and 15.9%, respectively, compared to the value at 9 AM (p=0.64, p=0.47).CONCLUSION:
These findings represent diurnal variation of surfactant proteins mRNA expression in vivo. This results suggested the diurnal variation of hydrophilic surfactant protein rather than hydrophobic surfactant proteins.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Surface-Active Agents
/
Pulmonary Surfactants
/
RNA, Messenger
/
Enzyme-Linked Immunosorbent Assay
/
Gene Expression
/
Circadian Rhythm
/
Pulmonary Surfactant-Associated Protein A
/
Lipoproteins
/
Lung
Limits:
Animals
Language:
Korean
Journal:
Korean Journal of Medicine
Year:
2001
Type:
Article
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