Estradiol reverses a calcium-related biomarker of brain aging in female rats.
An increase in L-type voltage-gated calcium channel (LTCC) current is a prominent biomarker of brain aging and is believed to contribute to cognitive decline and vulnerability to neuropathologies. Studies examining age-related changes in LTCCs have focused primarily on males, although estrogen (17beta-estradiol, E2) affects calcium-dependent activities associated with cognition. Therefore, to better understand brain aging in females, the effects of chronic E2 replacement on LTCC current activity in hippocampal neurons of young and aged ovariectomized rats were determined. The zipper slice preparation was used to expose cornu ammonis 1 (CA1) pyramidal neurons for recording LTCC currents using the cell-attached patch-clamp technique. We found that an age-related increase in LTCC current in neurons from control animals was prevented by E2 treatment. In addition, in situ hybridization revealed that within stratum pyramidale of the CA1 area, mRNA expression of the Ca(v)1.2 LTCC subunit, but not the Ca(v)1.3 subunit, was decreased in aged E2-treated rats. Thus, the reported benefits of E2 on cognition and neuronal health may be attributed, at least in part, to its age-related decrease in LTCC current.
Brewer
Lawrence D
LD
Department of Molecular and Biomedical Pharmacology, University of Kentucky, Lexington, Kentucky 40536, USA.
Dowling
Amy L S
AL
Curran-Rauhut
Meredith A
MA
Landfield
Philip W
PW
Porter
Nada M
NM
Blalock
Eric M
EM
D000375:Aging / Q000502:physiology*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D015220:Calcium Channels / Q000235:genetics / Q000378:metabolism*; D020746:Calcium Channels, L-Type / Q000235:genetics / Q000378:metabolism*; D004958:Estradiol / Q000494:pharmacology*; D015914:Estrogen Replacement Therapy; D005260:Female; D015870:Gene Expression; D006624:Hippocampus / Q000166:cytology / Q000187:drug effects* / Q000502:physiology; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000502:physiology; D010052:Ovariectomy; D018408:Patch-Clamp Techniques; D017966:Pyramidal Cells / Q000187:drug effects* / Q000502:physiology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D011916:Rats, Inbred F344
D015220:Calcium Channels; D020746:Calcium Channels, L-Type; C419385:L-type calcium channel alpha(1C); D012333:RNA, Messenger; C093712:Cacna1d protein, rat; D004958:Estradiol; D002118:Calcium