Somogyi Csilla Szűcs, Matta Csaba, Foldvari Zsofia, Juhász Tamás, Katona Éva, Takács Ádám Roland, Hajdú Tibor, Dobrosi Nóra, Gergely Pál, Zákány Róza
Department of Anatomy, Histology and Embryology, Faculty of Medicine, University of Debrecen, Debrecen H-4032, Hungary.
Department of Veterinary Preclinical Sciences, School of Veterinary Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
Int J Mol Sci. 2015 Aug 7;16(8):18412-38. doi: 10.3390/ijms160818412.
Mature and developing chondrocytes exist in a microenvironment where mechanical load, changes of temperature, osmolarity and acidic pH may influence cellular metabolism. Polymodal Transient Receptor Potential Vanilloid (TRPV) receptors are environmental sensors mediating responses through activation of linked intracellular signalling pathways. In chondrogenic high density cultures established from limb buds of chicken and mouse embryos, we identified TRPV1, TRPV2, TRPV3, TRPV4 and TRPV6 mRNA expression with RT-PCR. In both cultures, a switch in the expression pattern of TRPVs was observed during cartilage formation. The inhibition of TRPVs with the non-selective calcium channel blocker ruthenium red diminished chondrogenesis and caused significant inhibition of proliferation. Incubating cell cultures at 41 °C elevated the expression of TRPV1, and increased cartilage matrix production. When chondrogenic cells were exposed to mechanical load at the time of their differentiation into matrix producing chondrocytes, we detected increased mRNA levels of TRPV3. Our results demonstrate that developing chondrocytes express a full palette of TRPV channels and the switch in the expression pattern suggests differentiation stage-dependent roles of TRPVs during cartilage formation. As TRPV1 and TRPV3 expression was altered by thermal and mechanical stimuli, respectively, these are candidate channels that contribute to the transduction of environmental stimuli in chondrogenic cells.
成熟和发育中的软骨细胞存在于一个微环境中,在这个环境中,机械负荷、温度变化、渗透压和酸性pH值可能会影响细胞代谢。多模式瞬时受体电位香草酸(TRPV)受体是环境传感器,通过激活相关的细胞内信号通路来介导反应。在从鸡和小鼠胚胎肢芽建立的软骨生成高密度培养物中,我们通过逆转录聚合酶链反应(RT-PCR)鉴定了TRPV1、TRPV2、TRPV3、TRPV4和TRPV6的mRNA表达。在这两种培养物中,在软骨形成过程中观察到TRPVs表达模式的转变。用非选择性钙通道阻滞剂钌红抑制TRPVs会减少软骨生成,并导致增殖受到显著抑制。将细胞培养物在41°C下孵育会提高TRPV1的表达,并增加软骨基质的产生。当软骨生成细胞在分化为产生基质的软骨细胞时受到机械负荷作用,我们检测到TRPV3的mRNA水平升高。我们的结果表明,发育中的软骨细胞表达全套TRPV通道,表达模式的转变表明TRPVs在软骨形成过程中具有依赖分化阶段的作用。由于TRPV1和TRPV3的表达分别受到热刺激和机械刺激的影响,这些是有助于在软骨生成细胞中转导环境刺激的候选通道。