Role of Vasodilator Stimulated Phosphoprotein (VASP) in Pathogenesis of Osteosarcoma and its Association with Alkaline Phosphatase Levels

M. Halder, P. Roy, Abhrajyoti Ghosh
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引用次数: 1

Abstract

Osteosarcoma is the most common bone tumour seen in the paediatric and adolescent age group. Most osteosarcomas are highly malignant tumours arising within the bone. Several markers for diagnosis and prognosis have been proposed in osteosarcoma namely, vascular endothelial growth factor (VEGF), bone alkaline phosphatase, osteocalcin. A new family of a protein known as Vasodilator-stimulated phosphoprotein, which is known to promote cell migration may also have a role in metastasis of osteosarcoma. So this study was planned to estimate the serum concentration of VASP in patients of osteosarcoma and to find the correlation of it with serum alkaline phosphatase and compare them with controls. Fifty patients attending the Orthopaedics clinics were selected for the study and were divided into two groups. Histopathologically confirmed cases of osteosarcoma (localized without metastasis) were included in Group I and age and sex matched twenty five patients with musculoskeletal pain in Group II as controls. Serum alkaline phosphatase levels and serum vasodilator-stimulated phosphoprotein (VASP) levels were estimated and the result was analysed using standard statistical methods. It has been found that serum VASP levels were significantly decreased and serum alkaline phosphatase levels were significantly raised in patients with osteosarcoma (Group I) as compared to the controls. Serum alkaline phosphatase levels showed a positive correlation with serum VASP levels in control, which got inverted in osteosarcoma cases. VASP, a member of ENA/VASP family, has been implicated in regulating key cellular functions (namely shape change, adhesion and migration) due to its ability to modify dynamic cytoskeleton. The negative correlation between VASP and ALP in osteosarcoma patients also supported the role of VASP in bone mineralization and tumorigenesis. So, VASP in osteosarcomas may lead to improved stratification of outcome and development of novel therapeutic modalities.
血管舒张剂刺激磷酸化蛋白(VASP)在骨肉瘤发病中的作用及其与碱性磷酸酶水平的关系
骨肉瘤是儿童和青少年最常见的骨肿瘤。大多数骨肉瘤是发生在骨内的高度恶性肿瘤。血管内皮生长因子(VEGF)、骨碱性磷酸酶、骨钙素是骨肉瘤的诊断和预后指标。一个被称为血管舒张刺激磷酸化蛋白的新蛋白家族,已知可以促进细胞迁移,也可能在骨肉瘤的转移中起作用。因此本研究拟测定骨肉瘤患者血清VASP浓度,并与血清碱性磷酸酶的相关性,并与对照组进行比较。在骨科诊所就诊的50名患者被选为研究对象,分为两组。组织病理学证实的骨肉瘤(局部无转移)病例被纳入I组,年龄和性别匹配的25例肌肉骨骼疼痛患者被纳入II组作为对照。测定血清碱性磷酸酶水平和血清血管扩张剂刺激磷酸化蛋白(VASP)水平,并采用标准统计学方法对结果进行分析。研究发现,与对照组相比,骨肉瘤患者(I组)血清VASP水平显著降低,血清碱性磷酸酶水平显著升高。骨肉瘤患者血清碱性磷酸酶水平与VASP水平呈显著正相关,骨肉瘤患者血清碱性磷酸酶水平与VASP水平呈显著正相关。VASP是ENA/VASP家族的一员,由于其能够改变动态细胞骨架,因此涉及调节关键细胞功能(即形状改变,粘附和迁移)。骨肉瘤患者VASP与ALP呈负相关,也支持VASP在骨矿化和肿瘤发生中的作用。因此,VASP在骨肉瘤中的作用可能会改善结果的分层和发展新的治疗方式。
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