Advances in Clinical and Experimental Medicine
2020, vol. 29, nr 11, November, p. 1265–1275
doi: 10.17219/acem/127684
Publication type: original article
Language: English
License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)
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Effects of efavirenz and tenofovir on bone tissue in Wistar rats
1 Department of Pharmacology, Wroclaw Medical University, Poland
2 Division of Biomedical Engineering and Experimental Mechanics, Wroclaw University of Technology, Poland
3 Department of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Poland
4 Department of Pathology, Wroclaw Medical University, Poland
5 Department of Endocrinology, T. Marciniak Lower Silesian Specialist Hospital, Poland
6 Department of Medical Biochemistry, Wroclaw Medical University, Poland
Abstract
Background. Clinical trials indicate an increased risk of osteoporosis and bone fractures in people infected with human immunodeficiency virus (HIV). The pathogenesis of bone disturbances in HIV-positive patients is unknown, but it is suggested that antiretroviral drugs may be involved.
Objectives. To assess the effects of efavirenz (EF) and tenofovir (T) on bone remodeling in rats.
Material and Methods. The study involved 36 male Wistar rats divided into 3 groups, receiving normal saline (control group – group C), efavirenz (group EF) or tenofovir disoproxil (group T).
Results. After 24 weeks of the study, the following observations were made: In blood serum of the EF group compared to group C, there were increased levels of tartrate-resistant acid phosphatase form 5b (TRAP) and inorganic phosphorus. In the densitometric examination, group T showed a lower total body (TB) bone mineral density (BMD) than group C. In the immunohistochemical assessment, group EF showed a higher intensity and extension of anti-tartrate resistant acid phosphatase antibodies (abTRAP) compared to group C. In the histopathological examination of the second lumbar vertebra (L2), group EF showed a lower bone surface/volume ratio (BS/BV) and higher trabecular thickness (Tb.Th) than the control group. In the histopathological examination of the femur, a lower bone surface/tissue volume (BS/TV) and lower trabecular number (Tb.N) were found in group T compared to in group C. A lower value of the Young’s modulus was observed in the four-point bending trial in groups EF and T compared to group C.
Conclusion. The results of this study indicate that EF affects bone microarchitecture and leads to impaired biomechanical properties of bones in rats. Additionally, the negative effect of T on bone tissue was confirmed.
Key words
bone, rat model, efavirenz, tenofovir, antiretroviral drug
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