Young bone marrow Sca-1 cells protect aged retina from ischaemia-reperfusion injury through activation of FGF2.

ABSTRACT: Retinal ganglion cell apoptosis and optic nerve degeneration are prevalent in aged patients, which may be related to the decrease in bone marrow (BM) stem cell number/function because of the possible cross-talk between the two organs. This pathological process is accelerated by retinal ischaemia-reperfusion (I/R) injury. This study investigated whether young BM stem cells can regenerate and repair the aged retina after acute I/R injury. Young BM stem cell antigen 1 positive (Sca-1⁺ ) or Sca-1^- cells were transplanted into lethally irradiated aged recipient mice to generate Sca-1⁺ and Sca-1^- chimaeras, respectively. The animals were housed for 3 months to allow the young Sca-1 cells to repopulate in the BM of aged mice. Retinal I/R was then induced by elevation of intraocular pressure. Better preservation of visual function was found in Sca-1⁺ than Sca-1^- chimaeras 7 days after injury. More Sca-1⁺ cells homed to the retina than Sca-1^- cells and more cells differentiated into glial and microglial cells in the Sca-1⁺ chimaeras. After injury, Sca-1⁺ cells in the retina reduced host cellular apoptosis, which was associated with higher expression of fibroblast growth factor 2 (FGF2) in the Sca-1⁺ chimaeras. Young Sca-1⁺ cells repopulated the stem cells in the aged retina and diminished cellular apoptosis after acute I/R injury through FGF2 and Akt signalling pathways.

SUBMITTER: Shao Z 

PROVIDER: S-EPMC6237572 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature