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Corticotroph EGFR/POMC/ACTH Activation Module

Oncology Module corticotroph_egfr_pomc_acth_activation 1 disorder Pathograph 4
A corticotroph pituitary adenoma mechanism module in which activating USP8 alterations increase USP8 deubiquitinase activity, sustain EGFR signaling, increase POMC promoter activity, and drive corticotropin secretion. This module is intentionally separate from the somatotroph cAMP/PKA module because it explains corticotroph endocrine autonomy rather than GH-secreting somatotroph tumorigenesis.
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Pathophysiology Nodes

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4 shared nodes are defined in this module.
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Cell Types

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corticotroph CL:0002309 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves corticotroph (CL:0002309). CL:0002309 is a cell type from the Cell Ontology.
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Biological Processes

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protein deubiquitination GO:0016579 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased protein deubiquitination (GO:0016579). GO:0016579 is a biological process from the Gene Ontology. INCREASED EGFR signaling GO:0007173 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased EGFR signaling (GO:0007173). GO:0007173 is a biological process from the Gene Ontology. INCREASED POMC transcriptional activation GO:0045944 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased POMC transcriptional activation (GO:0045944). GO:0045944 is a biological process from the Gene Ontology. INCREASED corticotropin secretion GO:0051458 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased corticotropin secretion (GO:0051458). GO:0051458 is a biological process from the Gene Ontology. INCREASED
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Notes

This module is currently anchored by USP8-mutant Cushing disease. Other corticotroph adenoma mechanisms should conform to downstream nodes only when the EGFR/POMC/ACTH biology is actually supported.
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Used By Disorder Entries

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USP8-related pituitary adenoma 4 via Increased USP8 deubiquitinase activity , Sustained EGFR signaling in corticotrophs , Increased POMC transcriptional activation , Increased corticotropin secretion
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Pathograph

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Pathograph: causal mechanism network for Corticotroph EGFR/POMC/ACTH Activation Module Interactive directed graph showing how this shared module's pathophysiology nodes connect.
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Pathophysiology

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Increased USP8 deubiquitinase activity
trigger
Activating USP8 mutations disrupt normal 14-3-3-dependent control and increase USP8 proteolytic cleavage and catalytic deubiquitinase activity.
corticotroph CL:0002309 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves corticotroph (CL:0002309). CL:0002309 is a cell type from the Cell Ontology.
protein deubiquitination GO:0016579 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased protein deubiquitination (GO:0016579). GO:0016579 is a biological process from the Gene Ontology. INCREASED
Used by disorders
USP8-related pituitary adenoma 4
Downstream
  • Sustained EGFR signaling in corticotrophs Increased USP8 activity deubiquitinates EGFR, impairing receptor downregulation.
Sustained EGFR signaling in corticotrophs
central effector
Increased USP8-dependent EGFR deubiquitination impairs EGFR downregulation, sustaining EGFR signaling in corticotroph pituitary adenoma cells.
corticotroph CL:0002309 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves corticotroph (CL:0002309). CL:0002309 is a cell type from the Cell Ontology.
EGFR signaling GO:0007173 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased EGFR signaling, annotated with epidermal growth factor receptor signaling pathway (GO:0007173). GO:0007173 is a biological process from the Gene Ontology. INCREASED
Used by disorders
USP8-related pituitary adenoma 4
Downstream
  • Increased POMC transcriptional activation Sustained EGFR signaling increases transcriptional activation of POMC.
Increased POMC transcriptional activation
effector
USP8-mutant corticotroph adenoma cells show increased promoter activity of POMC, the precursor gene for ACTH.
corticotroph CL:0002309 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves corticotroph (CL:0002309). CL:0002309 is a cell type from the Cell Ontology.
POMC transcriptional activation GO:0045944 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased POMC transcriptional activation, annotated with positive regulation of transcription by RNA polymerase II (GO:0045944). GO:0045944 is a biological process from the Gene Ontology. INCREASED
Used by disorders
USP8-related pituitary adenoma 4
Downstream
  • Increased corticotropin secretion Increased POMC transcriptional activation supports excess ACTH production and secretion.
Increased corticotropin secretion
consequence
Corticotroph tumor cells secrete excess ACTH downstream of the USP8-EGFR-POMC axis, producing pituitary ACTH hypersecretion and Cushing disease physiology.
corticotroph CL:0002309 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves corticotroph (CL:0002309). CL:0002309 is a cell type from the Cell Ontology.
corticotropin secretion GO:0051458 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased corticotropin secretion (GO:0051458). GO:0051458 is a biological process from the Gene Ontology. INCREASED
Used by disorders
USP8-related pituitary adenoma 4