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Dalle Nogare M, D'Annunzio S, Vazza G, Regazzo D, Picello L, Denaro L, Voltan G, Scaroni C, Ceccato F, Occhi G. The Methylation Analysis of the Glucose-Dependent Insulinotropic Polypeptide Receptor (GIPR) Locus in GH-Secreting Pituitary Adenomas. Int J Mol Sci 2023; 24:ijms24119264. [PMID: 37298217 DOI: 10.3390/ijms24119264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/19/2023] [Accepted: 05/19/2023] [Indexed: 06/12/2023] Open
Abstract
The glucose-dependent insulinotropic polypeptide receptor (GIPR) is aberrantly expressed in about one-third of GH-secreting pituitary adenomas (GH-PAs) and has been associated with a paradoxical increase of GH after a glucose load. The reason for such an overexpression has not yet been clarified. In this work, we aimed to evaluate whether locus-specific changes in DNA methylation patterns could contribute to this phenomenon. By cloning bisulfite-sequencing PCR, we compared the methylation pattern of the GIPR locus in GIPR-positive (GIPR+) and GIPR-negative (GIPR-) GH-PAs. Then, to assess the correlation between Gipr expression and locus methylation, we induced global DNA methylation changes by treating the lactosomatotroph GH3 cells with 5-aza-2'-deoxycytidine. Differences in methylation levels were observed between GIPR+ and GIPR- GH-PAs, both within the promoter (31.9% vs. 68.2%, p < 0.05) and at two gene body regions (GB_1 20.7% vs. 9.1%; GB_2 51.2% vs. 65.8%, p < 0.05). GH3 cells treated with 5-aza-2'-deoxycytidine showed a ~75% reduction in Gipr steady-state level, possibly associated with the observed decrease in CpGs methylation. These results indicate that epigenetic regulation affects GIPR expression in GH-PAs, even though this possibly represents only a part of a much more complex regulatory mechanism.
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Affiliation(s)
| | - Sarah D'Annunzio
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, 38123 Trento, Italy
| | - Giovanni Vazza
- Department of Biology, University of Padova, 35128 Padova, Italy
| | - Daniela Regazzo
- Endocrinology Unit, Department of Medicine, Padova University Hospital, 35121 Padova, Italy
| | - Luna Picello
- Department of Biology, University of Padova, 35128 Padova, Italy
| | - Luca Denaro
- Academic Neurosurgery, Department of Neurosciences, Padova University Hospital, 35121 Padova, Italy
| | - Giacomo Voltan
- Endocrinology Unit, Department of Medicine, Padova University Hospital, 35121 Padova, Italy
| | - Carla Scaroni
- Endocrinology Unit, Department of Medicine, Padova University Hospital, 35121 Padova, Italy
| | - Filippo Ceccato
- Endocrinology Unit, Department of Medicine, Padova University Hospital, 35121 Padova, Italy
| | - Gianluca Occhi
- Department of Biology, University of Padova, 35128 Padova, Italy
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Tindula G, Lee D, Huen K, Bradman A, Eskenazi B, Holland N. Pregnancy lipidomic profiles and DNA methylation in newborns from the CHAMACOS cohort. ENVIRONMENTAL EPIGENETICS 2019; 5:dvz004. [PMID: 30956810 PMCID: PMC6444381 DOI: 10.1093/eep/dvz004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 02/25/2019] [Accepted: 02/27/2019] [Indexed: 05/29/2023]
Abstract
Lipids play a role in many biological functions and the newly emerging field of lipidomics aims to characterize the varying classes of lipid molecules present in biological specimens. Animal models have shown associations between maternal dietary supplementation with fatty acids during pregnancy and epigenetic changes in their offspring, demonstrating a mechanism through which prenatal environment can affect outcomes in children; however, data on maternal lipid metabolite levels during pregnancy and newborn DNA methylation in humans are sparse. In this study, we assessed the relationship of maternal lipid metabolites measured in the blood from pregnant women with newborn DNA methylation profiles in the Center for the Health Assessment of Mothers and Children of Salinas cohort. Targeted metabolomics was performed by selected reaction monitoring liquid chromatography and triple quadrupole mass spectrometry to measure 92 metabolites in plasma samples of pregnant women at ∼26 weeks gestation. DNA methylation was assessed using the Infinium HumanMethylation 450K BeadChip adjusting for cord blood cell composition. We uncovered numerous false discovery rate significant associations between maternal metabolite levels, particularly phospholipid and lysolipid metabolites, and newborn methylation. The majority of the observed relationships were negative, suggesting that higher lipid metabolites during pregnancy are associated with lower methylation levels at genes related to fetal development. These results further elucidate the complex relationship between early life exposures, maternal lipid metabolites, and infant epigenetic status.
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Affiliation(s)
- Gwen Tindula
- School of Public Health, Center for Environmental Research and Children’s Health, University of California, Berkeley, Berkeley, CA, USA
| | | | - Karen Huen
- School of Public Health, Center for Environmental Research and Children’s Health, University of California, Berkeley, Berkeley, CA, USA
| | - Asa Bradman
- School of Public Health, Center for Environmental Research and Children’s Health, University of California, Berkeley, Berkeley, CA, USA
| | - Brenda Eskenazi
- School of Public Health, Center for Environmental Research and Children’s Health, University of California, Berkeley, Berkeley, CA, USA
| | - Nina Holland
- School of Public Health, Center for Environmental Research and Children’s Health, University of California, Berkeley, Berkeley, CA, USA
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