| HTRA1 is a secreted/extracellular serine protease involved in protein quality control, extracellular matrix remodeling, TGF-β-family signaling, and disease-related proteolysis. The human HtrA family has four members, HtrA1–4, and reviews link HtrA dysregulation to cancer, arthritis, neurodegenerative disease, and reproductive disorders.
-most literature supports HTRA1 and HTRA3 as tumor-suppressive, while HTRA2 is more often associated with tumor growth and metastasis.
| Field |
Suggested Entry |
| Target |
HTRA1 / HtrA1 |
| Full Name |
HtrA serine peptidase 1 / high-temperature requirement A serine peptidase 1 |
| Target Class |
Secreted/extracellular serine protease; HtrA family protease |
| Primary Biology |
Extracellular matrix remodeling, protein quality control, TGF-β-family signaling modulation, proteolysis of misfolded or disease-associated proteins |
| Cancer Relevance |
Medium and context-dependent: often described as tumor-suppressive through effects on apoptosis, invasion, extracellular matrix, and chemotherapy response, but cancer type matters |
| AD Relevance |
Medium-high: implicated in APP/Aβ processing and broader protein-clearance biology; also relevant to vascular/degenerative disease mechanisms |
| Therapeutic Direction |
Context-dependent. In AD/protein-aggregation contexts, supporting appropriate HTRA1 protease activity may be beneficial. In cancer, HTRA1 is often tumor-suppressive, so restoration/support may be more logical than inhibition, but tumor-specific annotation is needed. |
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