Effects of age on expression of BKca channel in vascular smooth muscle cells from mesenteric arteries of spontaneously hypertensive rats
J. physiol. biochem
; 69(4): 945-955, dic. 2013.
Article
in English
| IBECS
| ID: ibc-121652
Responsible library:
ES1.1
Localization: BNCS
ABSTRACT
Abnormally functioning K+ channels during aging might contribute to increased arterial tone of vascular smooth muscle cells. However, changes in large conductance calcium-activated potassium (BKca) channel current density and channel protein composition during aging are not fully understood and are currently investigated here. Spontaneously hypertensive rats (SHR) and WistarKyoto (WKY) rats were grouped by age into very young (46 weeks), young (1618 weeks), and adult (4042 weeks) rats. BKca current was measured using a whole cell patch clamp in vascular smooth muscle cells from rat mesenteric arteries. BKca channel and subunits were measured using confocal imaging and real-time reverse transcriptase polymerase chain reaction techniques. Systolic and diastolic blood pressure increased significantly with age in both SHR and WKY rats. The expression of BKca á subunits increased in plasma membrane and cytoplasm in both SHR and WKY rats during aging, but had a larger increase in the cytoplasm in SHR than in WKY rats. BKca current density increased with aging in SHR but not in WKY rats. The relative abundance of BKca áand â1 mRNA transcripts changed minimally or not at all with aging in both SHR and WKY rats. In conclusion, plasma membrane BKca protein increased with aging in both SHR and WKY rats. Increases in cytoplasmic BKca protein and in BKca current were greater in SHR than WKY rats (AU)
Search on Google
Collection:
National databases
/
Spain
Database:
IBECS
Main subject:
Calcium Channels
/
Potassium Channels, Calcium-Activated
/
Muscle, Smooth, Vascular
Type of study:
Prognostic study
Limits:
Animals
Language:
English
Journal:
J. physiol. biochem
Year:
2013
Document type:
Article
Institution/Affiliation country:
Chinese Ministry of Education/China