Endocardial versus epicardial differences of sarcoplasmic reticulum Ca2+-ATPase gene expression in the canine failing myocardium

K. Igarashi-Saito, H. Tsutsui, M. Takahashi, S. Kinugawa, K. Egashira, A. Takeshita

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    It is unknown whether the transmural heterogeneity of sarcoplasmic reticulum (SR) Ca2+-ATPase gene expression is present within the left ventricular (LV) wall. Moreover, the changes of transmural distribution have not been examined in the failing hearts. We thus quantified steady-state mRNA abundance of SR Ca2+ regulatory proteins by Northern blot analysis in both subendocardial and subepicardial LV layers from normal and rapid pacing-induced heart failure (HF) dog hearts. For normal LV, Ca2+-ATPase mRNA abundance (normalized to glyceraldehyde-3-phosphate dehydrogenase [GAPDH] mRNA) was significantly reduced in the subendocardium, whereas calsequestrin mRNA abundance was comparable between the two layers. For HF LV, Ca2+-ATPase mRNA abundance in the subendocardium was also reduced compared to the subepicardium. However, the endocardium to epicardium ratio was comparable between control and HF (0.62 ± 0.08 vs. 0.65 ± 0.07; p = NS). Therefore, the transmural gradient of this gene was constant in both control and HF. Even though the data on the transmural heterogeneity of protein level is not available, the subendocardium contained significantly less Ca2+-ATPase mRNA, which might contribute, at least in part, to the transmural gradients of biochemical and mechanical function.

    Original languageEnglish
    Pages (from-to)267-273
    Number of pages7
    JournalBasic Research in Cardiology
    Volume94
    Issue number4
    DOIs
    Publication statusPublished - Aug 1999

    All Science Journal Classification (ASJC) codes

    • Physiology
    • Cardiology and Cardiovascular Medicine
    • Physiology (medical)

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