Intracerebral hemorrhage alters α2δ1 and thrombospondin expression in rats

Calcium voltage-gated channel auxiliary subunit (alpha 2 delta 1) is a non-essential subunit of the voltage-gated calcium channel complex and is ubiquitously expressed in a number of tissues, including the brain. Thrombospondin (TSP)1 and TSP2 are extracellular matrix proteins and belong to the multi-domain glycoprotein family of macromolecular oligomers. TSP1/2 and alpha 2 delta 1 promote synapse formation and functional recovery following cerebral infarction. However, to the best of our knowledge, the expression levels of alpha 2 delta 1 and TSP1/2 in brain tissues, and the effects of intracerebral hemorrhage (ICH) on these levels have not yet been elucidated. The present study established a rat model of hemorrhage induced by injecting collagenase IV into the striatum to determine the changes in alpha 2 delta 1 and TSP1/2 expression following ICH. The protein expression levels of alpha 2 delta 1 and TSP1 in the striatum after hemorrhage were significantly increased on day 5 and returned to baseline levels on day 21; however, the protein expression levels of TSP2 were decreased on day 5, whereas they increased on day 14, subsequently returning to baseline levels. In addition, using proteomics analysis of tissues from the sham group (saline injection) and at 24 h post-ICH, it was found that both alpha 2 delta 1 and TSP1 interacted with neural EGFL like 2. Taken together, these findings suggested that the expression levels of alpha 2 delta 1 and TSP1/2 were altered in brain tissues in response to ICH.