Synchronous modulation of cell surface lectin and its receptor in a homologous cell population: A novel mechanism of cellular regulation

Epididymal protein ASF is a D-galactose-specific lectin with apoptotic effect on human breast cancer cell line MCF7

Isolated caprine epididymal plasma glycoprotein "anti sticking factor" (ASF) interacts with caudal sperm surface in a D-galactose dependent manner. ASF acts as a Ca(2+) dependent soluble lectin principally activated in acidic pH. As a D-galactose specific lectin, it has a specific affinity for fibronectin as well as fibronectin receptor, i.e. integrins α5β3 and α5β1. By virtue of this particular property, it hampers the in vitro adhesion of the adherent breast cancer cell MCF7 with fibronectin. The effective anti-adhesive concentration of ASF promotes p53 dependent apoptosis in MCF7, which was established by Hoechst 33342 staining, DNA fragmentation assay, FITC tagged Annexin-V flowcytometry and western blot analysis. We suggest that ASF inhibits fibronectin-integrin interactions by binding with them and induces adhesion dependent apoptosis on adherent MCF7.

Optimum calcium concentration: a crucial factor in regulating sperm motility in vitro

Sperm motility can be maintained in vitro by incubation in a defined medium under specific conditions. In most studies, the exact role of various constituents of epididymal fluid, including calcium, has remained obscure. Most of the culture media have included millimolar concentrations of calcium, but previous reports have indicated that millimolar calcium inhibits sperm motility. In this present study, we sought the optimum concentration of extracellular calcium required for optimum sperm motility. This study showed that extracellular calcium has a concentration-dependent biphasic role in motility regulation. It promoted motility and velocity at lower (10 µM) concentration whereas notably inhibited it at higher concentrations. When external membrane-bound calcium was removed by ethylene glycol tetraacetic acid, motility decreased considerably. To confirm the motility-inhibiting role of calcium above 10 µM, a sperm motility-stimulating protein (MSP) recently reported from our laboratory was used which at 0.9 μM induces motility in 60-70 % cells. Calcium at 10 µM had no appreciable effect on the motility-promoting activity of the MSP but depressed the activity above 10 µM. Thus, our present results emphasize the biphasic role of extracellular calcium and the importance of its optimum concentration in different buffers and media used for sperm motility initiation.

Occurrence of novel Cu(2+)-dependent sialic acid-specific lectin, on the outer surface of mature caprine spermatozoa

Effects of several bivalent metal ions on the autoagglutination event in mature caprine epididymal sperm cells have been investigated using a chemically defined medium. This study demonstrates for the first time that Copper (Cu(2+)) ion (300 μM) has high specificity for autoagglutination of mature cauda-epididymal sperm. Head-to-head interaction of the male gametes is responsible for this event. Studies on the effect of various sugars reveal that the autoagglutinated cells can be dissociated specifically with neutralized sialic acid (50 mM), which also inhibits the sperm cell autoagglutination phenomenon. Blood serum protein fetuin, that contains terminal sialic acid residue, showed high efficacy for inhibiting this autoagglutination event at 4 μM concentration. However, asialofetuin is not capable of inhibiting this Cu(2+)-dependent cellular event. Mature sperm cells bound with caprine erythrocytes at their head region in presence of Cu(2+) ion. The purified sperm membrane fraction isolated by aqueous two phase polymer method showed high efficacy to agglutinate erythrocytes. These sperm-erythrocyte interactions as well as sperm membrane induced haemagglutination were strongly blocked by neutralized sialic acid (50 mM). The results confirm the occurrence of unique Cu(2+) dependent, sialic acid-specific lectin on the outer surface of a mammalian cell using caprine sperm as the model. The observed Cu(2+)-mediated cellular autoagglutination is caused by the interaction of the cell surface lectin with the lectin receptor on the surface of the neighboring homologous cell.

Homologous liver parenchymal cell-cell adhesion mediated by an endogenous lectin and its receptor

Many studies have implicated cell-surface lectins in heterologous cell-cell adhesion, but little is known about the participation of lectins in cellular adhesion in homologous cells. Here, we show the development of a cell model for investigating the direct role of a cell-surface lectin in homologous cell-cell adhesion. Parenchymal cells were isolated from caprine liver using a perfusion buffer, and dispersed in a chemically defined modified Ringer's solution. These cells undergo autoagglutination in the presence of Ca(2+). The autoagglutinated cells can be dissociated specifically with D-galactose (50 mM), which also inhibits the liver cell autoagglutination event. The blood serum protein fetuin has no effect on liver cell autoagglutination, whereas desialylated fetuin (100 microM), with its terminal D-galactose residue, showed a high affinity for blocking the autoagglutination event. The data demonstrates the occurrence of a Ca(2+)-dependent D-galactose-specific lectin and a lectin receptor on the parenchymal cells. Furthermore, it shows that the observed autoagglutination event is caused by the interaction of the cell-surface lectin with its receptor on the neighbouring homologous cells. The data supports the view that homologous cell-cell contact in mammalian tissues is triggered by such lectin-receptor interaction and that the previously reported cell-surface adhesive proteins serve as a secondary force to strengthen cell adhesion. This cell model could be extremely useful for investigating the direct role of cell-surface lectin and its receptor in homologous cell adhesion in a variety of tissues under normal and pathological conditions.