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Background  We aimed to assess the relationship between levels of a cerebrospinal fluid (CSF) marker of pericyte damage, soluble platelet-derived growth factor receptor β (sPDGFRβ) and CSF markers of blood-brain barrier (BBB) integrity (CSF albumin and CSF/serum albumin ratio) and disease pathology (reduced CSF Aβ42 and elevated CSF total and phosphorylated tau) in Alzheimer’s disease (AD).    Methods  sPDGFRβ and albumin were measured by sandwich ELISA in ante-mortem CSF from 39 AD and 39 age-matched controls that were grouped according to their biomarker profile (i.e. AD cases t-tau > 400 pg/mL, p-tau > 60 pg/mL and Aβ42 < 550 pg/mL). sPDGFRβ was also measured in matched serum and CSF samples ( n  = 23) in a separate neurologically normal group for which the CSF/serum albumin ratio had been determined.    Results  CSF sPDGFRβ level was significantly increased in AD ( p  = 0.0038) and correlated positively with albumin ( r  = 0.45,  p  = 0.007), total tau ( r  = 0.50,  p  = 0.0017) and phosphorylated tau ( r  = 0.41,  p  = 0.013) in AD but not in controls. CSF sPDGFRβ did not correlate with Aβ42. Serum and CSF sPDGFRβ were positively correlated ( r  = 0.547,  p  = 0.0085) in the independent neurologically normal CSF/serum matched samples.    Conclusions  We provide further evidence of an association between pericyte injury and BBB breakdown in AD and novel evidence that a CSF marker of pericyte injury is related to the severity of AD pathology.    Electronic supplementary material  The online version of this article (10.1186/s13195-019-0534-8) contains supplementary material, which is available to authorized users.

CSF evidence of pericyte damage in Alzheimer’s disease is associated with markers of blood-brain barrier dysfunction and disease pathology