We thus determined, whether the dual modulation in VGAT and VGLUT2 positive terminals, as observed in young animals, was altered as a function of age in cycling middle-aged rats.
These data suggest that the high level of myocardial fibrosis in the hearts of sham-operated middle-aged rats, particularly males, is probably age-related since data from younger animals did not reveal extensive fibrosis [ 13].
Furthermore, in most cases variability was increased in aged rats relative to young and middle-aged rats of the same strain, indicative of the emergence of individual differences in stress responsivity amongst older rats.
DOI: http://dx.doi.org/10.7554/eLife.04803.009 The present findings confirm the results of previous studies of progressive age-related memory impairment in the middle-aged rats (Rex et al., 2005; Kaczorowski and Disterhoft, 2009).
When adrenalectomy is performed during early postnatal life and treatment with corticosterone is given orally, the rate of neurogenesis in middle-aged rats does not differ from that of age-matched, sham-operated controls (Brunson et al., 2005).
Beginning at the age of 8 months, estrus cycles of the middle-aged rats were controlled.
Thus, IONPs showed a specific toxicity in middle-aged rats suggesting caution when using it in old age.
Additionally, it is unclear as to why there is an age-related decline in GnRH activation on proestrus in middle-aged rats.
Indication: *, significant difference from the middle-aged rats; #, significant difference from the familiar object of respective age animals, (p < 0.05).
SERT-IR showed an age-dependent increase followed by a moderate decrease in middle-aged rats in both structures; a decreased in SERT-IR in lateral septum and dorsal raphe of pubertal rats was observed after the FST.
Notably, middle-aged rats were impaired relative to young on both tasks.
