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In the interverebral disc, such response was also demonstrated to be induced by various environmental stresses. However, whether compression loading will cause cellular stress response in the nucleus pulposus cells (NPCs) is not well studied. By using an <jats:italic>in vitro<\/jats:italic> collagen microencapsulation model, we investigated the effect of compression loading on the stress response of NPCs. Cell viability tests and gene and protein expression experiments were conducted, with primers for the heat shock response (HSR: HSP70, HSF1, HSP27 and HSP90) and unfolded protein response (UPR: GRP78, GRP94, ATF4 and CHOP) genes and an antibody to HSP72. Different gene expression patterns occurred due to loading type throughout experiments. Increasing the loading strain for a short duration did not increase the stress response genes significantly, but over longer durations, HSP70 and HSP27 were upregulated. Longer loading durations also resulted in a continuous upregulation of HSR genes and downregulation of UPR genes, even after load removal. The rate of apoptosis did not increase significantly after loading, suggesting that stress response genes might play a role in cell survival following mechanical stress. These results demonstrate how mechanical stress might induce and control the expression of HSR and UPR genes in NPCs.<\/jats:p>","DOI":"10.1038\/srep26449","type":"journal-article","created":{"date-parts":[[2016,5,21]],"date-time":"2016-05-21T09:38:10Z","timestamp":1463823490000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Compression loading-induced stress responses in intervertebral disc cells encapsulated in 3D collagen constructs"],"prefix":"10.1038","volume":"6","author":[{"given":"Wai Hon","family":"Chooi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Barbara Pui","family":"Chan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2016,5,20]]},"reference":[{"key":"BFsrep26449_CR1","doi-asserted-by":"publisher","first-page":"214074","DOI":"10.1155\/2010\/214074","volume":"2010","author":"S Fulda","year":"2010","unstructured":"Fulda, S., Gorman, A. 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