Endocrine Abstracts

The cyclic AMP/PKA signalling cascade is involved in the pathogenesis of cortisol-secreting adrenocortical tumors (ACT). Defects in cell cycle checkpoints play a major role in oncogenesis. The PKA regulatory subunits PRKARIA and PRKARIIb are involved in cell survival and steroidogenesis in the adrenocortical carcinoma H295R cell line. We have previously shown that their inactivation enhances the accumulation of cells in the G2 phase and act...

The cyclic AMP/PKA signalling cascade and PKA subunits are involved in the pathogenesis of a subset of cortisol-secreting adrenocortical tumors (ACT). In addition, steroid excess causes morbidity of all types of ACT.The PKA regulatory subunits PRKARIA, PRKARIIb control proliferation/apoptosis in the H295R adrenocortical cell line. Their inactivation enhances the accumulation of cells in the G2 phase, increases steroidogenesis and activa...

The cAMP signaling cascade is one of the main pathways involved in the pathogenesis of adrenocortical tumors (ACT). Protein kinase A (PKA) is a key element of this pathway. The R1A and R2B proteins are the most abundant regulatory subunits in endocrine tissues. Inactivating mutations of PRKAR1A are observed in Carney complex and a subset of ACT. We have recently reported that inactivation of PRKAR1A dysregulates cAMP pathway and reduces TGFβ-induced apoptosi...

Introduction: Adrenal Cushing due to bilateral multiple adrenal tumors known as Primary Pigmented Nodular Adrenocortical Disease (PPNAD) can be observed in the multiple neoplasia syndrome Carney Complex or as an isolated disease. In both situations germline inactivating mutations of PRKAR1A (regulatory subunit R1A of PKA) can be observed. The loss of PKA R1A results in an increased PKA activity. Comparison of the transcriptome of PPNAD and stably transfected H295R adr...

The cyclic AMP (cAMP) signalling cascade is one of the main pathways involved in the pathogenesis of adrenocortical tumors (ACT). PRKARIA or PRKARIIb are involved in the proliferation/apoptosis in a subset of tumors.Majors alterations of genes involved in both cell proliferation and the cell cycle have been described by transcriptome and miRNome analysis in various types of adrenocortical tumors (ACC, ACA, AIMAH, and PPNAD). In addition...

The cAMP signaling pathway plays an important role in cell proliferation and differentiation, and can be altered at multiple levels in endocrine tumors. Its central component is the protein kinase A (PKA). Inactivating mutations of PRKAR1A are observed in CNC (a dominant autosomal hereditary disease responsible for primary pigmented nodular adrenocortical disease, cardiac myxoma and lentiginosis). Most PRKAR1A mutations lead to mRNA unstability and protein degrad...

cAMP/PKA pathway activation is frequently involved in endocrine tumors with overactivity. The Carney complex (CNC) is an autosomal dominant multiple endocrine neoplasia syndrome which associates cardiac myxomas, spotty skin pigmentation and endocrine overactivity. Mutations in the PRKAR1A gene located at 17q22-24 and encoding for the R1A regulatory subunit of protein kinase A have been found in about 60% of CNC. These mutations are heterozygous germline mutations leading to ab...

BackgroundARMC5 is a putative tumor suppressor gene that is frequently mutated in primary bilateral macronodular adrenal hyperplasia (PBMAH), a rare cause of Cushing’s syndrome. The function of ARMC5 is poorly known, aside the fact that it regulates cell apoptosis and adrenal steroidogenesis in by mechanisms still unknown. Tumor suppressor genes play an important role in oxidative stress.MethodsIn this s...

ARMC5 is a tumor suppressor gene responsible for 20 to 40% of Primary Bilateral Macronodular Adrenal Hyperplasia (PBMAH) with a function that remains unclear. Based on pathway analysis from RNAseq results obtained on zebrafish models of transient Armc5 up- and down-regulation, we identified transcriptional alterations of several members of SIRT1 (sirtuin (silent mating type information regulation 2 homolog) 1) signaling in our models and hypothesized that ARM...

Introduction: Primary Bilateral Macronodular Adrenal Hyperplasia (PBMAH) is a rare cause of ACTH-independent Cushing syndrome. It is characterized by the development of supracentimetric nodules resulting in increased adrenal volume and weight. Its presentation is clinically, radiologically and biologically heterogeneous. Morphological descriptions of PBMAH are rare. Although the initial description highlights that multinodular hyperplastic adrenal glands are made of a majority...