急性和慢性应激源对自发性高血压大鼠长骨形态功能特征的影响:一项使用组织学和显微断层扫描分析的初步研究
Impact of Acute and Chronic Stressors on the Morphofunctional Characteristics of Long Bones in Spontaneously Hypertensive Rats: A Pilot Study Using Histological and Microtomographic Analysis.
作者信息
Paulini Marina Ribeiro, Pitol Dimitrius Leonardo, Feldman Sara, Ribeiro Camila Aparecida, Buchaim Daniela Vieira, Buchaim Rogerio Leone, Issa João Paulo Mardegan
机构信息
Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, University of São Paulo (FORP-USP), Ribeirão Preto 14040-904, Brazil.
LABOATEM-Laboratory of Ostearticular Biology and Tissue Engineering, School of Medicine, Rosario S2002, Argentina.
出版信息
Biomedicines. 2025 Jul 10;13(7):1689. doi: 10.3390/biomedicines13071689.
Hypertension is a major contributor to cardiovascular diseases and is often intensified by psychological stress, which can also affect bone metabolism. Although both conditions independently compromise bone health, their combined impact-particularly under acute and chronic stress-remains unclear. This pilot study aimed to assess the effects of such stressors on bone structure in spontaneously hypertensive rats (SHRs). Forty male rats, both normotensive and SHRs, were randomly assigned to control, acute stress, or chronic stress groups. Acute stress involves a single 2 h physical restraint. Chronic stress was induced over 10 days using alternating stressors: agitation, forced swimming, physical restraint, cold exposure, and water deprivation. Tibial bones were analyzed by microcomputed tomography (micro-CT), and histology was performed using Hematoxylin and Eosin and Masson's Trichrome stains. Micro-CT showed increased trabecular bone volume in normotensive rats under chronic stress, whereas SHRs displayed impaired remodeling under both stress types. Histological analysis revealed preserved connective tissue overall but evident changes in growth plate structure among stressed rats. SHRs exhibited exacerbated trabecular formation and cartilage abnormalities, including necrotic zones. Both acute and chronic stress, especially in the context of hypertension, negatively affect bone remodeling and maturation. Despite the absence of overt inflammation, structural bone changes were evident, indicating potential long-term risks. These findings highlight the importance of further studies on stress-hypertension interactions in bone health as well as the exploration of therapeutic approaches to mitigate skeletal damage under such conditions.
高血压是心血管疾病的主要促成因素,常因心理压力而加剧,心理压力也会影响骨代谢。虽然这两种情况都会独立损害骨骼健康,但其综合影响——尤其是在急性和慢性应激情况下——仍不清楚。这项初步研究旨在评估这些应激源对自发性高血压大鼠(SHR)骨骼结构的影响。40只雄性大鼠,包括正常血压大鼠和SHR,被随机分为对照组、急性应激组或慢性应激组。急性应激包括单次2小时的身体束缚。慢性应激通过交替应激源在10天内诱导产生:激动、强迫游泳、身体束缚、冷暴露和禁水。通过微计算机断层扫描(micro-CT)分析胫骨,并用苏木精和伊红以及Masson三色染色进行组织学检查。Micro-CT显示,慢性应激下正常血压大鼠的小梁骨体积增加,而SHR在两种应激类型下均表现出重塑受损。组织学分析显示,整体结缔组织保存,但应激大鼠的生长板结构有明显变化。SHR表现出小梁形成加剧和软骨异常,包括坏死区。急性和慢性应激,尤其是在高血压背景下,都会对骨重塑和成熟产生负面影响。尽管没有明显的炎症,但骨骼结构变化明显,表明存在潜在的长期风险。这些发现凸显了进一步研究应激与高血压在骨骼健康方面的相互作用以及探索减轻此类情况下骨骼损伤的治疗方法的重要性。