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Distinct Pattern of Endoplasmic Reticulum Protein Processing and Extracellular Matrix Proteins in Functioning and
Alexander K Eieland1,2, Kjersti R Normann1,2,3, Arvind Y M Sundaram4
1Section of Specialized Endocrinology, Department of Endocrinology, Oslo University Hospital (OUS), 0424 Oslo, Norway.
Cancers
|October 17, 2020
Summary
Functioning (FCA) and silent corticotroph (SCA) pituitary adenomas exhibit distinct molecular profiles, impacting treatment strategies. Understanding these differences in protein processing and adhesion molecules is key to managing these challenging tumors.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Functioning (FCA) and silent corticotroph (SCA) pituitary adenomas present distinct clinical behaviors despite similar immunohistochemical markers.
- FCAs cause hypercortisolemia, while SCAs are characterized by invasive and recurrent tendencies.
- The underlying molecular mechanisms differentiating FCA and SCA remain unclear.
Purpose of the Study:
- To investigate global transcriptome and proteome changes in FCA and SCA pituitary adenomas.
- To identify signaling pathways that explain the distinct clinical behaviors of FCA and SCA.
- To elucidate molecular differences related to hormone production versus aggressive growth.
Main Methods:
- Transcriptomic analysis using cluster analysis of differentially expressed genes.
- Proteomic analysis to assess protein expression patterns.
- Comparative analysis of gene and protein expression between FCA and SCA groups.
Main Results:
- Transcriptomic data revealed distinct molecular groups aligning with clinical classifications.
- Proteomic analysis indicated greater heterogeneity within the SCA group.
- Both adenoma types showed altered expression of genes/proteins involved in protein synthesis and vesicular transport.
- FCA group overexpressed genes related to endoplasmic reticulum protein processing.
- Distinct collagen/extracellular matrix proteins and adhesion molecules were identified in each group.
Conclusions:
- FCA and SCA pituitary adenomas possess unique molecular signaling pathway repertoires.
- FCAs demonstrate an increased capacity for protein processing.
- SCAs exhibit a specific pattern of adhesion molecules potentially linked to aggressiveness.
- These findings offer insights into targeted therapeutic strategies for corticotroph adenomas.
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