Abstract
Diabetes-associated cognitive dysfunction (DACD) has ascended to become the second leading cause of mortality among diabetic patients. Phosphoserine phosphatase (PSPH), a pivotal rate-limiting enzyme in L-serine biosynthesis, has been documented to instigate the insulin signaling pathway through dephosphorylation. Concomitantly, CD38, acting as a mediator in mitochondrial transfer, is activated by the insulin pathway. Given that we have demonstrated the beneficial effects of exogenous mitochondrial supplementation on DACD, we further hypothesized whether astrocytic PSPH could contribute to improving DACD by promoting astrocytic mitochondrial transfer into neurons. In the Morris Water Maze (MWM) test, our results demonstrated that overexpression of PSPH in astrocytes alleviated DACD in db/db mice. Astrocyte specific-stimulated by PSPH lentivirus/ adenovirus promoted the spine density both in vivo and in vitro. Mechanistically, astrocytic PSPH amplified the expression of CD38 via initiation of the insulin signaling pathway, thereby promoting astrocytic mitochondria transfer into neurons. In summation, this comprehensive study delineated the pivotal role of astrocytic PSPH in alleviating DACD and expounded upon its intricate cellular mechanism involving mitochondrial transfer. These findings propose that the specific up-regulation of astrocytic PSPH holds promise as a discerning therapeutic modality for DACD.
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Data Availability
All data that support the fundings of this study are available from corresponding author upon reasonable request.
Abbreviations
- AAV:
-
Adeno-Associated Viruses
- ACM:
-
Astrocyte-Conditioned Media
- AKT:
-
Protein Kinase B
- ATP:
-
Adenosine Triphosphate
- cADPR:
-
cyclic ADP-Ribose
- CD38:
-
Cluster of Differentiation 38
- CO-IP:
-
Co-Immunoprecipitation
- DACD:
-
Diabetes-Associated Cognitive Dysfunction
- DMEM:
-
Dulbecco?s Modified Eagle Medium
- EDTA:
-
Ethylenediaminetetraacetic Acid
- GFAP:
-
Glial Fibrillary Acidic Protein
- GSK3?:
-
Glycogen Synthase Kinase-3?
- HE:
-
Haematoxylin and Eosin
- IF:
-
Immunofluorescent Staining
- IRS-1:
-
Insulin Receptor Substrate 1
- LV:
-
Lentivirus
- MAPK:
-
Mitogen-Activated Protein Kinase
- MWM:
-
Morris Water Maze
- PSPH:
-
Phosphoserine Phosphatase
- SDS-PAGE:
-
Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis
- TUNEL:
-
TdT-Mediated dUTP Nick-End Labeling
- T2DM:
-
Type 2 Diabetes Mellitus
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Funding
National Natural Science Foundation of China (Grants Nos. 81974540, 81801899), the Key Research & Development Program of Shaanxi (Program No. 2022ZDLSF02-09) and Innovation Capability Support Program of Shaanxi (Program No. 2021TD-58), Basic Research Program of Natural Sciences of Shaanxi Province (Grant No. 2022JQ-850).
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Q.W., J.Z., H.M., and Y.L. contributed to the conceptualization and study design. Development of methodology, investigation, and original draft preparation was done by H.M., S.H., Y.L., X.Z., H.C., M.D., S.J., H.G., and C.Y. assisted in experimental procedures. Manuscript review and editing was done by H.M., S.H., S.J., H.G., Q.W., J.Z. All the authors read and approved the final manuscript. H.M. and S.H. contributed equally to this study.
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Ma, H., He, S., Li, Y. et al. Augmented Mitochondrial Transfer Involved in Astrocytic PSPH Attenuates Cognitive Dysfunction in db/db Mice. Mol Neurobiol (2024). https://doi.org/10.1007/s12035-024-04064-0
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DOI: https://doi.org/10.1007/s12035-024-04064-0