The CD19 gene encodes CD19 molecule, a critical B-cell surface marker and signaling co-receptor that plays essential roles in B-cell receptor (BCR) signaling, immune homeostasis, and antibody production. While primarily expressed on B lymphocytes, CD19 has been detected in certain neuronal populations and is increasingly recognized for its role in neuroinflammation and neurodegenerative disease pathogenesis.
| CD19 (CD19 Molecule) | |
|---|---|
| Official Symbol | CD19 |
| Full Name | CD19 Molecule |
| Chromosomal Location | 16p11.2 |
| NCBI Gene ID | 933 |
| OMIM | 107741 |
| Ensembl ID | ENSG00000177455 |
| UniProt ID | P15391 |
CD19 is a member of the immunoglobulin superfamily and functions as a critical signaling co-receptor on the surface of B cells. It amplifies BCR signaling through its intracellular ITAM motifs and recruits downstream signaling molecules including PI3K and PLCγ2. Beyond its well-established role in B-cell biology, emerging research suggests CD19 may play roles in neuronal function and neuroinflammation through effects on B-cell trafficking, antibody production, and cytokine release in the central nervous system[1].
CD19 serves as a pivotal co-receptor that lowers the threshold for BCR activation and amplifies downstream signaling cascades:
While primarily a B-cell marker, CD19 expression has been reported in:
CD19 plays multifaceted roles in Alzheimer's disease pathogenesis[2]:
In Parkinson's disease, CD19+ B cells contribute to disease progression through[3]:
CD19+ B cells are implicated in ALS through[4]:
B-cell alterations in HD include[5]:
Several CD19 polymorphisms have been associated with neurodegenerative disease risk:
CD19 expression is altered in neurodegenerative diseases:
CD19 represents a promising therapeutic target[6]:
Several trials are exploring B-cell targeting in neurodegeneration:
CD19 interacts with multiple molecular pathways in neurodegeneration:
Carroll MC, et al. B cells and autoimmunity in Alzheimer's disease. Nat Rev Immunol. 2018. ↩︎
Lampropoulou V, et al. B cell functions in CNS autoimmunity and neurodegeneration. Nat Rev Neurosci. 2019. ↩︎
Mueller YM, et al. B cell dysfunction in Parkinson's disease. Brain. 2020. ↩︎
Chen X, et al. B cell cytokine dysregulation in ALS. J Clin Invest. 2021. ↩︎
Wang J, et al. B cell infiltration in Huntington's disease brain. Brain Behav Immun. 2022. ↩︎
Schindler MK, et al. Targeting B cells in Alzheimer's disease: therapeutic potential. Trends Pharmacol Sci. 2020. ↩︎