Abstract:
:PDA is a major cause of US cancer-related deaths. Oncogenic Kras presents in 90% of human PDAs. Kras mutations occur early in pre-neoplastic lesions but are insufficient to cause PDA. Other contributing factors early in disease progression include chronic pancreatitis, alterations in epigenetic regulators, and tumor suppressor gene mutation. GPCRs activate heterotrimeric G-proteins that stimulate intracellular calcium and oncogenic Kras signaling, thereby promoting pancreatitis and progression to PDA. By contrast, Rgs proteins inhibit Gi/q-coupled GPCRs to negatively regulate PDA progression. Rgs16::GFP is expressed in response to caerulein-induced acinar cell dedifferentiation, early neoplasia, and throughout PDA progression. In genetically engineered mouse models of PDA, Rgs16::GFP is useful for pre-clinical rapid in vivo validation of novel chemotherapeutics targeting early lesions in patients following successful resection or at high risk for progressing to PDA. Cultured primary PDA cells express Rgs16::GFP in response to cytotoxic drugs. A histone deacetylase inhibitor, TSA, stimulated Rgs16::GFP expression in PDA primary cells, potentiated gemcitabine and JQ1 cytotoxicity in cell culture, and Gem + TSA + JQ1 inhibited tumor initiation and progression in vivo. Here we establish the use of Rgs16::GFP expression for testing drug combinations in cell culture and validation of best candidates in our rapid in vivo screen.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Layeghi-Ghalehsoukhteh S,Pal Choudhuri S,Ocal O,Zolghadri Y,Pashkov V,Niederstrasser H,Posner BA,Kantheti HS,Azevedo-Pouly AC,Huang H,Girard L,MacDonald RJ,Brekken RA,Wilkie TMdoi
10.1038/s41598-020-77373-8subject
Has Abstractpub_date
2020-11-26 00:00:00pages
20662issue
1issn
2045-2322pii
10.1038/s41598-020-77373-8journal_volume
10pub_type
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