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Title

Regulation of parathyroid hormone-related protein production in a human lung squamous cell carcinoma line

Authors
Feyen, JH M
Published in Journal of Endocrinology. 1994, vol. 143, no. 2, p. 333-41
Abstract The synthesis and release of parathyroid hormone-related protein (PTHrP) could be influenced in a paracrine or autocrine manner by substances present around or inside tumours, such as bone or stromal cell-derived cytokines, factors produced by the tumour itself or by peritumoural inflammatory cells. We investigated the effects of various cytokines known to be synthesized by osteoblasts, stromal cells, leucocytes or cancer cells, on PTHrP production by the human lung squamous cell carcinoma line BEN. The influence of tumour necrosis factor-alpha (TNF-alpha) and interleukin-6 (IL-6) was studied, and compared with those of insulin-like growth factors-I and -II (IGF-I, IGF-II), or macrophage- or granulocyte-macrophage colony-stimulating factors (M-CSF, GM-CSF). TNF-alpha caused a 1.9 +/- 0.1-fold increase in immunoreactive PTHrP production, which was maximal by 24 h of incubation. IL-6 caused a 2.3 +/- 0.2-fold increase, which was maximal by 16 h. These effects, which were time- and concentration-dependent, were blocked by monoclonal antibodies raised against the corresponding cytokine. An increase of PTHrP mRNA was found in IL-6-treated cells. IGF-I and IGF-II increased PTHrP production by 2.0 +/- 0.3- and 2.3 +/- 0.1-fold respectively. Neither M-CSF nor GM-CSF altered PTHrP production up to 64 h of incubation. PTHrP production was not affected by varying extracellular calcium concentrations, but was decreased by incubation with 100 nmol/l dexamethasone.(ABSTRACT TRUNCATED AT 250 WORDS)
Keywords CarcinomaSquamous Cell/metabolismCytokines/pharmacologyDexamethasone/pharmacologyDose-Response RelationshipDrugGranulocyte-Macrophage Colony-Stimulating Factor/pharmacologyHumansInsulin-Like Growth Factor I/pharmacologyInsulin-Like Growth Factor II/pharmacologyInterleukin-6/pharmacologyLung Neoplasms/metabolismNeoplasm Proteins/biosynthesisParathyroid Hormone/biosynthesisParathyroid Hormone-Related ProteinProtein BiosynthesisStimulationChemicalTumor CellsCulturedTumor Necrosis Factor-alpha/pharmacology
Identifiers
PMID: 7829996
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Structures
Projects FNS: 32-32415-91
League against Cancer of Geneva
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(ISO format)
RIZZOLI, René et al. Regulation of parathyroid hormone-related protein production in a human lung squamous cell carcinoma line. In: Journal of Endocrinology, 1994, vol. 143, n° 2, p. 333-41. https://archive-ouverte.unige.ch/unige:26383

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Deposited on : 2013-02-14

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