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Appears in Networks 1

In-Edges 5

a(MESH:Brain) association act(p(HGNC:NPEPPS)) View Subject | View Object

Aminopeptidases are a group of enzymes that cleave from the N-terminal end of a protein. The family includes alanyl, arginyl, and glutamyl peptidases. Puromycin sensitive aminopeptidase (PSA) is an alanyl peptidase that is responsible for s90% of the aminopeptidase activity in the brain(10). PubMed:24027553

bp(GO:autophagy) association p(HGNC:NPEPPS) View Subject | View Object

PSA has been shown to be involved in the induction of autophagy and specifically the formation of autophagosomes, in a model of overexpressed mutant huntingtin (32). Thus, the in vivo effects of PSA on promoting tau clearance may relate to its ability to modulate the key clearance pathway for abnormal and aggregated proteins (to be described in more detail below). PubMed:24027553

p(MGI:Mapt, var("p.P301L")) positiveCorrelation p(HGNC:NPEPPS) View Subject | View Object

Interestingly, PSA was found to be elevated in the cerebellum of these TAUP301L mice (10). The levels of PSA are also higher in human cerebellum compared to cortex in both controls and FTD cases. A slight elevation in PSA was also observed in FTD cortices compared to controls. PubMed:24027553

path(MESH:"Frontotemporal Dementia") positiveCorrelation p(HGNC:NPEPPS) View Subject | View Object

Interestingly, PSA was found to be elevated in the cerebellum of these TAUP301L mice (10). The levels of PSA are also higher in human cerebellum compared to cortex in both controls and FTD cases. A slight elevation in PSA was also observed in FTD cortices compared to controls. PubMed:24027553

Out-Edges 12

act(p(HGNC:NPEPPS)) association a(MESH:Brain) View Subject | View Object

Aminopeptidases are a group of enzymes that cleave from the N-terminal end of a protein. The family includes alanyl, arginyl, and glutamyl peptidases. Puromycin sensitive aminopeptidase (PSA) is an alanyl peptidase that is responsible for s90% of the aminopeptidase activity in the brain(10). PubMed:24027553

p(HGNC:NPEPPS) positiveCorrelation p(MGI:Mapt, var("p.P301L")) View Subject | View Object

Interestingly, PSA was found to be elevated in the cerebellum of these TAUP301L mice (10). The levels of PSA are also higher in human cerebellum compared to cortex in both controls and FTD cases. A slight elevation in PSA was also observed in FTD cortices compared to controls. PubMed:24027553

p(HGNC:NPEPPS) decreases p(MGI:Mapt, var("p.P301L")) View Subject | View Object

In addition, a non-functional PSA mutant exacerbated tau pathology in a Drosophila model of tauopathy, while overexpressing PSA ameliorated the tau phenotype and diminished tau levels (10). Overexpressing PSA had a similar effect in the TAUP301L mice, reducing the pathologic phenotype (delaying paralysis, increasing motor neuron density in the spinal cord, decreasing gliosis) and decreasing tau levels (12). PubMed:24027553

p(HGNC:NPEPPS) positiveCorrelation path(MESH:"Frontotemporal Dementia") View Subject | View Object

Interestingly, PSA was found to be elevated in the cerebellum of these TAUP301L mice (10). The levels of PSA are also higher in human cerebellum compared to cortex in both controls and FTD cases. A slight elevation in PSA was also observed in FTD cortices compared to controls. PubMed:24027553

p(HGNC:NPEPPS) decreases path(MESH:Tauopathies) View Subject | View Object

In addition, a non-functional PSA mutant exacerbated tau pathology in a Drosophila model of tauopathy, while overexpressing PSA ameliorated the tau phenotype and diminished tau levels (10). Overexpressing PSA had a similar effect in the TAUP301L mice, reducing the pathologic phenotype (delaying paralysis, increasing motor neuron density in the spinal cord, decreasing gliosis) and decreasing tau levels (12). PubMed:24027553

p(HGNC:NPEPPS) decreases p(HGNC:MAPT) View Subject | View Object

In addition, a non-functional PSA mutant exacerbated tau pathology in a Drosophila model of tauopathy, while overexpressing PSA ameliorated the tau phenotype and diminished tau levels (10). Overexpressing PSA had a similar effect in the TAUP301L mice, reducing the pathologic phenotype (delaying paralysis, increasing motor neuron density in the spinal cord, decreasing gliosis) and decreasing tau levels (12). PubMed:24027553

p(HGNC:NPEPPS) regulates deg(p(HGNC:MAPT)) View Subject | View Object

For example, it has been shown that the isomerase Pin1, which has been implicated in AD (30), had opposite effects on P301L and wild-type tau degradation (31). An alternative explanation for the effects of PSA may be that PSA is indirectly regulating tau degradation. PubMed:24027553

p(HGNC:NPEPPS) decreases path(MESH:Paralysis) View Subject | View Object

In addition, a non-functional PSA mutant exacerbated tau pathology in a Drosophila model of tauopathy, while overexpressing PSA ameliorated the tau phenotype and diminished tau levels (10). Overexpressing PSA had a similar effect in the TAUP301L mice, reducing the pathologic phenotype (delaying paralysis, increasing motor neuron density in the spinal cord, decreasing gliosis) and decreasing tau levels (12). PubMed:24027553

p(HGNC:NPEPPS) decreases path(MESH:Gliosis) View Subject | View Object

In addition, a non-functional PSA mutant exacerbated tau pathology in a Drosophila model of tauopathy, while overexpressing PSA ameliorated the tau phenotype and diminished tau levels (10). Overexpressing PSA had a similar effect in the TAUP301L mice, reducing the pathologic phenotype (delaying paralysis, increasing motor neuron density in the spinal cord, decreasing gliosis) and decreasing tau levels (12). PubMed:24027553

p(HGNC:NPEPPS) increases p(HGNC:MAPT, frag("1_?")) View Subject | View Object

PSA was able to cleave recombinant tau in vitro, as well as tau from control human brain (11). However, the data presented in this study suggest that PSA is cleaving tau from both the C- and N-terminal ends, which is not expected from an aminopeptidase. Additionally, other studies failed to demonstrate tau cleavage by PSA (28, 29). PubMed:24027553

p(HGNC:NPEPPS) increases p(HGNC:MAPT, frag("?_*")) View Subject | View Object

PSA was able to cleave recombinant tau in vitro, as well as tau from control human brain (11). However, the data presented in this study suggest that PSA is cleaving tau from both the C- and N-terminal ends, which is not expected from an aminopeptidase. Additionally, other studies failed to demonstrate tau cleavage by PSA (28, 29). PubMed:24027553

p(HGNC:NPEPPS) association bp(GO:autophagy) View Subject | View Object

PSA has been shown to be involved in the induction of autophagy and specifically the formation of autophagosomes, in a model of overexpressed mutant huntingtin (32). Thus, the in vivo effects of PSA on promoting tau clearance may relate to its ability to modulate the key clearance pathway for abnormal and aggregated proteins (to be described in more detail below). PubMed:24027553

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BEL Commons is developed and maintained in an academic capacity by Charles Tapley Hoyt and Daniel Domingo-Fernández at the Fraunhofer SCAI Department of Bioinformatics with support from the IMI project, AETIONOMY. It is built on top of PyBEL, an open source project. Please feel free to contact us here to give us feedback or report any issues. Also, see our Publishing Notes and Data Protection information.

If you find BEL Commons useful in your work, please consider citing: Hoyt, C. T., Domingo-Fernández, D., & Hofmann-Apitius, M. (2018). BEL Commons: an environment for exploration and analysis of networks encoded in Biological Expression Language. Database, 2018(3), 1–11.