{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T23:53:58Z","timestamp":1791158038197,"version":"4.1.0"},"reference-count":48,"publisher":"Portland Press Ltd.","issue":"3","content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2008,6,15]]},"abstract":"<jats:p>Single-chain peptides have been recently produced that display either mimetic or antagonistic properties against the insulin and IGF-1 (insulin-like growth factor 1) receptors. We have shown previously that the insulin mimetic peptide S597 leads to significant differences in receptor activation and initiation of downstream signalling cascades despite similar binding affinity and in vivo hypoglycaemic potency. It is still unclear how two ligands can initiate different signalling responses through the IR (insulin receptor). To investigate further how the activation of the IR by insulin and S597 differentially activates post-receptor signalling, we studied the gene expression profile in response to IR activation by either insulin or S597 using microarray technology. We found striking differences between the patterns induced by these two ligands. Most remarkable was that almost half of the genes differentially regulated by insulin and S597 were involved in cell proliferation and growth. Insulin either selectively regulated the expression of these genes or was a more potent regulator. Furthermore, we found that half of the differentially regulated genes interact with the genes involved with the MAPK (mitogen-activated protein kinase) pathway. These findings support our signalling results obtained previously and confirm that the main difference between S597 and insulin stimulation resides in the activation of the MAPK pathway. In conclusion, we show that insulin and S597 acting via the same receptor differentially affect gene expression in cells, resulting in a different mitogenicity of the two ligands, a finding which has critical therapeutic implications.<\/jats:p>","DOI":"10.1042\/bj20080279","type":"journal-article","created":{"date-parts":[[2008,5,9]],"date-time":"2008-05-09T11:01:07Z","timestamp":1210330867000},"page":"435-445","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Activation of the insulin receptor (IR) by insulin and a synthetic peptide has different effects on gene expression in IR-transfected L6 myoblasts"],"prefix":"10.1042","volume":"412","author":[{"given":"Maja","family":"Jensen","sequence":"first","affiliation":[{"name":"Receptor Systems Biology Laboratory, Hagedorn Research Institute, Niels Steensensvej 6, 2820 Gentofte, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jane","family":"Palsgaard","sequence":"additional","affiliation":[{"name":"Receptor Systems Biology Laboratory, Hagedorn Research Institute, Niels Steensensvej 6, 2820 Gentofte, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rehannah","family":"Borup","sequence":"additional","affiliation":[{"name":"Microarray Center, Rigshospitalet, 2100 Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierre","family":"de\u00a0Meyts","sequence":"additional","affiliation":[{"name":"Receptor Systems Biology Laboratory, Hagedorn Research Institute, Niels Steensensvej 6, 2820 Gentofte, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauge","family":"Sch\u00e4ffer","sequence":"additional","affiliation":[{"name":"Diabetes Protein Engineering, Novo Nordisk A\/S, 2760 M\u00e5l\u00f8v, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"288","published-online":{"date-parts":[[2008,5,28]]},"reference":[{"key":"2021112215122315400_B1","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1038\/nrd917","article-title":"Structural biology of insulin and IGF1 receptors: implications for drug design","volume":"1","author":"De\u00a0Meyts","year":"2002","journal-title":"Nat. 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