Ayat Magdy; Sohair Ramadan Fahmy; Ayman Saber Mohamed; Dalia Y. Saad; Reham S. Desokyand & Ahmed Abdel Aziz Baiomy

Osteoporosis is a bone condition marked by a loss of bone mass and a disruption of bone microarchitecture. Men lose bone density as they age, resulting in brittle bones. The loss of free testosterone is one of the key factors. The objective of present study was to evaluate Allolobophora caliginosa extract (AcE) for its anti-osteoporotic and antiapoptotic activity in orchiotomized rat model at two different dose levels. Twenty eight male rats were divided into two groups. The first group represented sham operated rats while the second group underwent bilateral orchidectomy (OCX). After one week of recovery from orchidectomy surgery, the second group was randomly subdivided into 3 subgroups. The first OCX subgroup was administered orally distilled water daily for 10 weeks. The other two OCX subgroups were administered AcE (100 or200 mg/kg body weight/day) orally for 10 weeks. Orchiectomy induces remarkable loss of the cortical as well as trabecular bone loss; which, could be counterbalanced by Allolobophora caliginosa extract (AcE) that prevented cortical as well as trabecular bone loss. Allolobophora caliginosa extract (AcE) at Dose 200 mg/kg/day was found to be effective at a highly significant level in osteoporotic bone, as determined by histological images and immunohistochemical study, where Dose (100 mg/kg/day) was found to be moderately significant.In the present study, it is suggested that AcE may inhibit steroid-induced osteoblasts apoptosis, potentially via upregulation of Bcl-2 and downregulation of caspase-3. Allolobophora caliginosa extract demonstrates anti-apoptotic and anti-oxidant properties. Therefore, AcE may be used for the prevention of steroid-induced bone damage.

KEY WORDS: Osteoporosis; Allolobophora caliginosa extract; Orchiotomized rat; Histopathology; Apoptosis.

MAGDY, A.; FAHMY, S. R.; MOHAMED, A. S.; SAAD, D. Y.; DESOKYAND, R. S. & BAIOMY, A. A. A. Histopathological and immunohistochemical study of antiosteoporotic efficacy of the earthworm Allolobophora caliginosa extract in orchiectomized rats. Int. J. Morphol., 40(1):277-286, 2022.