“…Therefore, we analyzed the expression levels of signaling competent full-length (FL) and the dominant negative truncated (T1) TrkB receptors in the hippocampus of differently aged BDNF +/À and wild type mice and detected a similar decline in the expression of both FL-TrkB and TrkB-T1 receptors for both genotypes (Fig. 4), thus corroborating several previous studies (Costa et al, 2012;Croll et al, 1998;Silhol et al, 2005). Recently, a compensatory up-regulation of TrkB receptors in the hippocampus of 7.5 months old BDNF +/À mice has been reported (Carreton et al, 2012).…”