Product Code Database
Lacritin is a 12.3 kDa glycoprotein encoded in humans by the LACRT gene. Lacritin's discovery emerged from a screen for factors that stimulate tear protein secretion. Lacritin is a secreted protein found in tears and saliva. Lacritin also promotes tear secretion, the cell growth and survival of epithelial cells, and corneal wound healing Lacritin is thus a multifunctional prosecretory mitogen with cell survival activity. Natural or bacterial cleavage of lacritin releases a C-terminal fragment that is bactericidal.
Most lacritin is produced by the lacrimal gland, including the accessory lacrimal gland of Wolfring. Some lacritin is produced by the meibomian gland, and by epithelial cells of the conjunctiva and cornea. Together these epithelia comprise much of the lacrimal functional unit (LFU). Dry eye is the most common disease of the LFU. A growing number of studies suggest that lacritin may be differentially downregulated in dry eye, including contact lens-related dry eye. Topical lacritin promotes tearing in rabbit preclinical studies. In the Aire knockout mouse model of dry eye (considered similar to human Sjogren's syndrome), topical lacritin restores pilocarpine-induced tearing, largely eliminates lissamine green staining and reduces the size of inflammatory foci in the lacrimal gland.
Lacritin cell targeting is dependent on the cell surface heparan sulfate proteoglycan syndecan-1 (SDC1). Binding utilizes an enzyme-regulated 'off-on' switch in which active epithelial heparanase (HPSE) cleaves off heparan sulfate to expose a binding site in the N-terminal region of syndecan-1's core protein. A G-protein-coupled receptor (GPCR) then appears to be ligated. Targeted cells signal to NFAT and mTOR if conditions are suitable for proliferation, or to AKT and FOXO3 under conditions of stress.
Lacritin is subject to crosslinking by tissue transglutaminase, thereby giving rise to lacritin multimers including dimers and trimers. Crosslinking is initiated within 1 min in vitro, requiring as little as 0.1 nM lacritin. The ~0.6 micro molar level of tissue transglutaminase estimated in human tears is sufficient to promote crosslinking. Crosslinking involves the donors lysine 82 and 85 and the acceptor glutamine 106. Glutamine 106 resides within the amphipathic alpha helix near the C-terminus responsible for binding the N-terminus of syndecan-1. Accordingly, crosslinked lacritin binds syndecan-1 poorly and is inactive.
Several lacritin splice variants have been detected in Aceview, from NEIBank EST data. Lacritin-b (11.1 kDa; p I 5.3) lacks the sequence SIVEKSILTE. Lacritin-c (10.7 kDa; p I 4.6) displays a novel C-terminus that should be incapable of binding syndecan-1, and lacks cell survival activity.
Splice variants are proteoforms. Proteoforms include proteolytically processed forms of lacritin. Top down mass spec sequencing revealed that human tears contain five N- and forty-two different C-terminal lacritin-a proteoforms. Some approximate the bioactive lacritin synthetic peptides 'N-104', 'N-94' and 'N-94/C-6' from lacritin's C-terminus. Protease inhibitor studies suggest that processing of lacritin into C-terminal proteoforms requires a variety of tear proteases including cathepsin B, calpain, alanyl amino peptidase, arginyl aminopeptidase, MMP9, MMP10, cathepsin G, plasma kallikrein, plasmin, thrombin and trypsin. C-terminal proteoforms, like intact lacritin, are selectively deficient in dry eye tears.
Biotinylated cell surface proteins from a lacritin-responsive cell were incubated with lacritin under conditions of physiological salt. Those that bound lacritin were sequenced by mass spectrometry. Few bound. The most prominent was syndecan-1 (SDC1). In confirmatory pull-down assays, binding was not shared with family members syndecan-2 or syndecan-4, indicating that the protein core (and not the negatively charged heparan sulfate side-chains) was the main site of binding. Further analysis narrowed the site to syndecan-1's N-terminal 51 amino acids, and subsequently to the N-terminal sequence GAGAL that is conserved in syndecan-1's from different species. GAGAL promotes the alpha helicity of lacritin's C-terminal amphipathic alpha helix and likely binds to the hydrophobic face. Syndecan-1 binds many growth factors through its long heparan sulfate side-chains. Yet, long heparan sulfate chains interfere with lacritin binding. Since syndecans are always decorated with heparan sulfate, this means that heparanase must be available to partially or completely cleave off heparan sulfate, allowing lacritin to bind. Indeed, no binding was detected from cells lacking heparanase after siRNA depletion. Binding was restored by spiking in exogenous heparanase or heparitinase. Thus, heparanase regulates lacritin function as an 'on-switch'. Exposed 3-O sulfated groups on heparanase-cleaved heparan sulfate (that likely interacts with the cationic face of lacritin's C-terminal amphipathic alpha helix), and an N-terminal chondroitin sulfate chain (likely also binds to the cationic face) appear to contribute to binding. Point mutagenesis of lacritin has narrowed the ligation site. This novel heparanase mechanism appears at first glance to be poor for ocular health since heparanase release from invading lymphocytes in the corneal stroma is inflammatory. Yet heparanase is a normal secretory product of the corneal epithelium.
Lacritin-dependent mitogenesis is inhibitable by pertussis toxin. The implication is that another key element of lacritin targeting specificity is a G-protein-coupled receptor that would presumably form a cell surface targeting complex with SDC1. Involvement of a G-protein coupled receptor would explain the rapidity of lacritin signaling.
Lacritin is an LFU prosecretory mitogen and survival factor with a biphasic dose response that is optimal at 1 - 10 nM for human Recombinant DNA lacritin on human cells. Higher human lacritin concentrations are optimal on rat or mouse cells or on rabbit eyes. In a recent phase I/II clinical trial, a 22 μM topical dose of 'Lacripep' applied three times daily was effective at two weeks in primary Sjogren's Syndrome patients with an eye dryness score greater than 60, a score indicative of moderate to severe dry eye. Both corneal fluorescein staining and the symptom of burning/stinging were reduced. In keeping with a biphasic dose response, the 44 μM dose was largely ineffective. A biphasic dose response has a bell-shaped curve, with doses lower or higher than the dose optimum less effective. Other mitogens share this property. However, in secretion assays using monkey lacritin on monkey lacrimal acinar cells, the dose response appears to be sigmoidal with increasing lipocalin or lactoferrin secretion through a narrow 0.1, 0.3 and 1 μM dose range. Lacritin flows downstream from the lacrimal gland through ducts onto the human eye.
Artificial depletion of lacritin from normal human tears revealed that tears lacking lacritin are unable to promote the survival of ocular surface cells stressed with inflammatory cytokines. Human dry eye tears also lack this activity. However, dry eye tears supplemented with lacritin are fully protective. Similarly, tears artificially depleted of lacritin are deficient in bactericidal activity. The antibody used to deplete lacritin also depletes C-terminal proteoforms. These observations suggest that among all tear proteins, lacritin may be the master protector.
Dry eye tears are subject to premature collapse, as are normal human tears artificially depleted of C-terminal proteoforms. In both cases, stability is largely restored by spiking in synthetic lacritin peptides N-94 or N-94/C-6 as proxy C-terminal proteoforms. Each peptide inserts rapidly into (O-acyl)-omega-hydroxy fatty acid (OAHFA) thought to reside at the aqueous lipid boundary in tears. OAHFA is the only class of tear lipids apparently downregulated in dry eye.
Lacritin mitogenic signaling follows two pathways:
Lacritin survival signaling is observed when cells are stressed. Lacritin promotes survival and homeostasis by transiently stimulating autophagy. The mechanism appears to involve lacritin stimulated acetylation of the transcription factor FOXO3. Acetylated FOXO3 serves as a ligand for the autophagic mediator ATG101. Lacritin also promotes coupling of FOXO1 (that becomes acetylated with stress) with autophagic mediator ATG7. In the absence of lacritin, no coupling is observed. Thus acetylation alone is likely insufficient for FOXO1-ATG7 ligation, unlike an initial claim. Lacritin also restores oxidative phosphorylation and other metabolic events to rescue cells from stress.
Lacritin stimulated secretion of tear proteins lipocalin and lactoferrin from monkey lacrimal acinar cells does not appear to be mediated by Ca2+, unlike the agonist carbachol. When monkey lacrimal acinar cells are stressed with inflammatory cytokines (as occurs in dry eye), carbachol loses its capacity to promote the secretion of lipocalin. However, lacritin stimulates lipocalin secretion even in the presence of stress.
|
|
