J Toxicol Pathol. 2012 Dec;25(4):287-91. doi: 10.1293/tox.25.287. Epub 2012 Dec 20.
Age-related Histological Findings in the Pineal Gland of Crl:CD(SD) Rats.
Journal of toxicologic pathology
Yuki Tomonari, Junko Sato, Yumi Wako, Minoru Tsuchitani
Affiliations
Affiliations
- Pathology Department, Kashima Laboratory, Nonclinical Research Center, Mitsubishi Chemical Medience Corporation, 14-1 Sunayama, Kamisu, Ibaraki 314-0255, Japan.
PMID: 23345933
PMCID: PMC3517926 DOI: 10.1293/tox.25.287
Abstract
To provide background data as the pathologic basis, the pineal glands of 190 male and 193 female Crl:CD(SD) rats at ages of 0-7, 51-58, 70-85 and 111 weeks were examined histologically in this study. Mineralization and fibrosis were common findings in the aged rats, whereas they were rarely found in the young ones; mineralization was present in 7, 44, 67 and 79% of males and in 0, 32, 67 and 79% in females, and fibrosis was present in 0, 29, 48 and 44% of males and 0, 18, 40 and 35% of females at ages of 0-7, 51-58, 70-85 and 111 weeks, respectively. Striated muscle fiber appeared regularly in the fibrosis region from 51-58 weeks of age when fibrosis increased, while the origin of this fiber remained unclear. Vacuolation of pineal cells also increased with age in both sexes, though the total incidence was low. There was a low incidence of lymphocytic infiltration in both sexes, but this was not related to age.
Keywords: age-related finding; pineal gland; rat; spontaneous lesion; striated muscle fiber
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