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- Title
Bicarbonate-Dependent Secretion and Proteolytic Processing of Recombinant Myocilin.
- Authors
Aroca-Aguilar, José-Daniel; Martínez-Redondo, Francisco; Martín-Gil, Alba; Pintor, Jesús; Coca-Prados, Miguel; Escribano, Julio
- Abstract
Myocilin is an extracellular glycoprotein of poorly understood function. Mutations of this protein are involved in glaucoma, an optic neuropathy characterized by a progressive and irreversible visual loss and frequently associated with elevated intraocular pressure. We previously showed that recombinant myocilin undergoes an intracellular proteolytic processing by calpain II which cleaves the central region of the protein, releasing one N- and one C-terminal fragment. Myocilin cleavage is reduced by glaucoma mutations and it has been proposed to participate in intraocular pressure modulation. To identify possible factors regulating the proteolytic processing of recombinant myocilin, we used a cellular model in which we analyzed how different culture medium parameters (i.e., culture time, cell density, pH, bicarbonate concentration, etc.) affect the presence of the extracellular C-terminal fragment. Extracellular bicarbonate depletion associated with culture medium acidification produced a reversible intracellular accumulation of full-length recombinant myocilin and incremented its intracellular proteolytic processing, raising the extracellular C-terminal fragment percentage. It was also determined that myocilin intracellular accumulation depends on its N-terminal region. These data suggest that aqueous humor bicarbonate variations could also modulate the secretion and cleavage of myocilin present in ocular tissues.
- Subjects
MYOCILIN; GLAUCOMA; GENETIC mutation; INTRAOCULAR pressure; CYSTEINE proteinases; PROTEINASES
- Publication
PLoS ONE, 2013, Vol 8, Issue 1, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0054385