Synapse formation and elimination are fundamental processes that is essential for the assembly of neural circuits in the brain during development. Defects in these processes result in abnormal synaptic densities in the brain, which is believed to contribute towards the pathogenesis of many neurodevelopmental disorders. The goal of the proposed research is to understand how Sushi Repeat Protein X-linked 2 (SRPX2) regulates synapse density in the brain. We have previously shown that the sushi repeat protein X-linked 2 (SRPX2) gene codes for a neuronally-expressed secreted synaptogenic protein that increases the density of excitatory synapses in cor- tical neurons. Sushi repeats are predominantly found in known complement regulators in the periphery. Our preliminary data suggests that SRPX2 inhibits complement activation in the brain, thereby decreasing synapse pruning and increasing synapse density. To test this hypothesis, we proposed the following aims.
Aim 1 : Deter- mine if SRPX2 signals through the classical complement pathway to regulate synapse density and elimination.
Aim 2 : Determine if SRPX2 inhibits the classical complement cascade by binding to C1q.
Aim 3 : Determine if SRPX2 is required in the adult and aged brain for synapse maintenance. We anticipate that these studies will provide new insights into the molecular mechanisms underlying synapse elimination in the developing brain, and may lead to novel therapeutic approaches for treating developmental and degenerative brain disorders.

Public Health Relevance

The proposed research examines the molecular and cellular basis of SRPX2 regulation of synapse den- sity. This work will increase our understanding of how synapses are pruned during development, and may lead to novel treatments of neurodevelopmental and neurodegenerative diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
1R01NS112389-01
Application #
9799164
Study Section
Synapses, Cytoskeleton and Trafficking Study Section (SYN)
Program Officer
Churn, Severn Borden
Project Start
2019-05-15
Project End
2024-01-31
Budget Start
2019-05-15
Budget End
2020-01-31
Support Year
1
Fiscal Year
2019
Total Cost
Indirect Cost
Name
University of Texas Health Science Center
Department
Pharmacology
Type
Schools of Medicine
DUNS #
800772162
City
San Antonio
State
TX
Country
United States
Zip Code
78229