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- W2012351992 abstract "The production and release of GH has been demonstrated in a variety of extra-pituitary tissues. In this respect insulin-producing pancreatic tumours are also of interest because it has been observed that GH may promote islet cell proliferation. However, these effects have only been related to GH of pituitary origin and the possibility of local production of GH with autocrine-/paracrine effects has not been considered. In this study, a reverse transcriptase polymerase chain reaction (RT-PCR) was used to demonstrate the presence of GH mRNA in pancreatic tissue of five healthy dogs and insulinomas of 14 dogs. After Southern blotting of the RT-PCR products, blots were hybridized using a canine-specific GH-probe and quantified using phosphor imaging. GH gene expression was further demonstrated by in situ hybridization using a canine digoxigenin-labelled GH-specific cDNA probe. In addition, GH immunohistochemistry was performed. In five samples of normal pancreatic tissue a weak hybridization signal was found. This signal was significantly higher in nine of 12 primary tumours. In ten of 11 metastases there was a positive hybridization signal, and this signal was also significantly higher than in the primary tumours. In situ hybridization in one sample demonstrated that GH mRNA was only produced in the tumour cells. The local production of GH was confirmed by positive staining of tumour tissue with anti-GH antibodies in ten of 12 samples. It is concluded that canine insulinomas express the gene encoding GH mRNA. The locally produced GH may have an autocrine/paracrine effect on tumour progression. The relatively high expression levels in metastases of these tumours may be related to the low inhibitory influence of somatostatin outside the pancreas." @default.
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- W2012351992 date "2002-11-01" @default.
- W2012351992 modified "2023-09-27" @default.
- W2012351992 title "Locally produced growth hormone in canine insulinomas" @default.
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- W2012351992 doi "https://doi.org/10.1016/s0303-7207(02)00268-x" @default.
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