Year: 2021 | Month: April | Volume 11 | Issue 2
Identification of Differentially Expressed Tear Proteins after Corneal Reconstruction with DPSIS Graft in Dogs Suffering from Keratoconjunctivitis Sicca
Differentially expressed tear proteins after corneal reconstruction with decellularized porcine small intestinal sub mucosa (DPSIS) in Keratoconjunctivitis sicca (KCS) affected dogs was explored through Matrix Assisted Laser Desorption/Ionization Mass spectrometry (MALDI-TOF/MS) followed by Peptide mass fingerprinting (PMF). Anterior lamellar keratoplasty followed by DPSIS graft was performed in seven dogs with corneal ulcer (group A) and in nine dogs with corneal ulcer as a complication of KCS (group B). Tear was also collected from 12 healthy dogs with no ocular pathology. PMF based protein identification was performed on tryptic peptides of tear film trapped in major bands of ID-SDS PAGE (in duplicate) using MALDI-TOF/MS. PMF revealed 432 unique tear proteins from major gel bands of DPSIS treated dogs (group A and B) and normal tear from healthy dogs. Based on MOWSE score, relative abundance of proteins in both groups were compared with that in normal tear. Proteins USP37, KRT1, Major allergen Can F1, CCDC39, PRKCD, Serum albumin, TERT and CD163 were found to be significantly (p<0.001) down-regulated in group A and group B compared to normal tear from healthy dogs. Protein INVS was found significantly up regulated (p<0.001) in Group B post DPSIS graft compared to pre-operative tear. ZNF252 was found significantly up regulated (p<0.001) in Group A tear film post-operatively compared to pre-operative tear. Intrinsic cellular stress disrupting DNA replication and cell division, cellular senescence and apoptosis were found as key events underlying corneal pathology in KCS which needs consideration while attempting surgical reconstruction of cornea using DPSIS graft.
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