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• W2022732642 abstract "Previous studies indicate that steroid hormones may be protective for Schwann cells and promote the expression of myelin proteins in the sciatic nerve of adult rats. In this study, we have evaluated the effect of progesterone (P), dihydroprogesterone (DHP), tetrahydroprogesterone (THP), testosterone (T), dihydrotestosterone (DHT) and 5alpha-androstan-3alpha, 17beta-diol (3alpha-diol) on the morphological alterations of myelinated fibers in the sciatic nerve of 22-24-month-old male rats. The sciatic nerves of untreated old male rats, showed a general disorganization and a significant reduction in the density of myelinated fibers, compared to nerves from 3-month-old male rats. The effect of aging was particularly evident in myelinated fibers of small caliber (<5 microm in diameter). In addition, the sciatic nerves of old rats showed a significant increase in the number of fibers with myelin infoldings in the axoplasm and in the number of fibers with irregular shapes. Treatments of old rats with P, DHP and THP resulted in a significant increase in the number of myelinated fibers of small caliber, a significant reduction in the frequency of myelin abnormalities and a significant increase in the g ratio of small myelinated fibers. Furthermore, P treatment significantly reduced the frequency of myelinated fibers with irregular shapes. In contrast, treatments with T, DHT or 3alpha-diol did not significantly affect any of the morphological parameters examined. In conclusion, our data indicate that P, and its derivatives DHP and THP, are able to reduce aging-associated morphological abnormalities of myelin and aging-associated myelin fiber loss in the sciatic nerve. These data suggest that P, DHP and THP may represent useful therapeutic alternatives to maintain peripheral nerve integrity in aged animals." @default.
• W2022732642 created "2016-06-24" @default.
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• W2022732642 date "2003-10-01" @default.
• W2022732642 modified "2023-10-01" @default.
• W2022732642 title "Progesterone and its derivatives dihydroprogesterone and tetrahydroprogesterone reduce myelin fiber morphological abnormalities and myelin fiber loss in the sciatic nerve of aged rats" @default.
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• W2022732642 doi "https://doi.org/10.1016/s0197-4580(02)00234-8" @default.
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