Key Spec Table
|Species Reactivity||Key Applications||Host||Format||Antibody Type|
|Av, H, M, R||IP, WB||Rb||Serum||Polyclonal Antibody|
|Application||This Anti-Fyn Antibody is validated for use in IP, WB for the detection of Fyn.|
|Safety Information according to GHS|
|Storage and Shipping Information|
|Storage Conditions||2 years at -20°C|
|Material Size||250 µL|
|Anti-Fyn - 16314||16314|
|Anti-Fyn - 19409||19409|
|Anti-Fyn - 31952||31952|
|Reference overview||Application||Pub Med ID|
|Cholinergic signaling inhibits oxalate transport by human intestinal T84 cells.|
Hassan, HA; Cheng, M; Aronson, PS
American journal of physiology. Cell physiology 302 C46-58 2012
Urolithiasis remains a very common disease in Western countries. Seventy to eighty percent of kidney stones are composed of calcium oxalate, and minor changes in urinary oxalate affect stone risk. Intestinal oxalate secretion mediated by anion exchanger SLC26A6 plays a major constitutive role in limiting net absorption of ingested oxalate, thereby preventing hyperoxaluria and calcium oxalate urolithiasis. Using the relatively selective PKC-δ inhibitor rottlerin, we had previously found that PKC-δ activation inhibits Slc26a6 activity in mouse duodenal tissue. To identify a model system to study physiologic agonists upstream of PKC-δ, we characterized the human intestinal cell line T84. Knockdown studies demonstrated that endogenous SLC26A6 mediates most of the oxalate transport by T84 cells. Cholinergic stimulation with carbachol modulates intestinal ion transport through signaling pathways including PKC activation. We therefore examined whether carbachol affects oxalate transport in T84 cells. We found that carbachol significantly inhibited oxalate transport by T84 cells, an effect blocked by rottlerin. Carbachol also led to significant translocation of PKC-δ from the cytosol to the membrane of T84 cells. Using pharmacological inhibitors, we observed that carbachol inhibits oxalate transport through the M(3) muscarinic receptor and phospholipase C. Utilizing the Src inhibitor PP2 and phosphorylation studies, we found that the observed regulation downstream of PKC-δ is partially mediated by c-Src. Biotinylation studies revealed that carbachol inhibits oxalate transport by reducing SLC26A6 surface expression. We conclude that carbachol negatively regulates oxalate transport by reducing SLC26A6 surface expression in T84 cells through signaling pathways including the M(3) muscarinic receptor, phospholipase C, PKC-δ, and c-Src.
|Flotillin-1 mediates neurite branching induced by synaptic adhesion-like molecule 4 in hippocampal neurons.|
Swanwick CC, Shapiro ME, Vicini S, Wenthold RJ
Mol Cell Neurosci 45 213-25. Epub 2010 Jun 25. 2010
Proper development of neurons in the hippocampus is essential for learning and memory. Our laboratory previously discovered a family of synaptic adhesion-like molecules (SALMs) which induce neurite outgrowth in this brain region (Wang et al., 2006). Here we establish flotillin-1 (flot-1) as a molecular mediator of neurite branching for SALM4. Knockdown of flot-1 alone in cultured hippocampal neurons using siRNA from 3-7days in vitro (DIV) impaired neurite branching, whereas overexpression of flot-1 during the same time period increased the number of processes and branching. We show that induction of neurite outgrowth by flot-1 depends on amino acids 134-151 as well as lipid raft microdomains, SoHo proteins to regulate the actin cytoskeleton, and the exocyst complex to deliver new membrane proteins to growing neurites. When each of SALMs 1-5 was overexpressed, siRNA knockdown of flot-1 prevented neurite branching by SALM4. Overall, our data reveal a flot-1 signaling pathway for hippocampal neurite branching that is regulated by SALM4.
|Regulation of ultraviolet B-induced phosphorylation of histone H3 at serine 10 by Fyn kinase|
He, Z., et al
J Biol Chem, 280:2446-54 (2005) 2005
|Expression of kinase-defective mutants of c-Src in human metastatic colon cancer cells decreases Bcl-xL and increases oxaliplatin- and Fas-induced apoptosis.|
Griffiths, GJ; Koh, MY; Brunton, VG; Cawthorne, C; Reeves, NA; Greaves, M; Tilby, MJ; Pearson, DG; Ottley, CJ; Workman, P; Frame, MC; Dive, C
The Journal of biological chemistry 279 46113-21 2004
Tumor resistance to current drugs prevents curative treatment of human colon cancer. A pressing need for effective, tumor-specific chemotherapies exists. The non-receptor-tyrosine kinase c-Src is overexpressed in greater than 70% of human colon cancers and represents a tractable drug target. KM12L4A human metastatic colon cancer cells were stably transfected with two distinct kinase-defective mutants of c-src. Their response to oxaliplatin, to SN38, the active metabolite of irinotecan (drugs active in colon cancer), and to activation of the death receptor Fas was compared with vector control cells in terms of cell cycle arrest and apoptosis. Both kinase-defective forms of c-Src co-sensitized cells to apoptosis induced by oxaliplatin and Fas activation but not by SN38. Cells harboring kinase-defective forms of c-Src carrying function blocking point mutations in SH3 or SH2 domains were similarly sensitive to oxaliplatin, suggesting that reduction in kinase activity and not a Src SH2-SH3 scaffold function was responsible for the observed altered sensitivity. Oxaliplatin-induced apoptosis, potentiated by kinase-defective c-Src mutants, was dependent on activation of caspase 8 and associated with Bid cleavage. Each of the stable cell lines in which kinase-defective mutants of c-Src were expressed had reduced levels of Bcl-x(L.) However, inhibition of c-Src kinase activity by PP2 in vector control cells did not alter the oxaliplatin response over 72 h nor did it reduce Bcl-x(L) levels. The data suggest that longer term suppression of Src kinase activity may be required to lower Bcl-x(L) levels and sensitize colon cancer cells to oxaliplatin-induced apoptosis.
|Phosphatidylinositol 3-kinase interacts with the adaptor protein Dab1 in response to Reelin signaling and is required for normal cortical lamination.|
Bock, HH; Jossin, Y; Liu, P; Förster, E; May, P; Goffinet, AM; Herz, J
The Journal of biological chemistry 278 38772-9 2003
Reelin is a large secreted signaling protein that binds to two members of the low density lipoprotein receptor family, the apolipoprotein E receptor 2 and the very low density lipoprotein receptor, and regulates neuronal positioning during brain development. Reelin signaling requires activation of Src family kinases as well as tyrosine phosphorylation of the intracellular adaptor protein Disabled-1 (Dab1). This results in activation of phosphatidylinositol 3-kinase (PI3K), the serine/threonine kinase Akt, and the inhibition of glycogen synthase kinase 3beta, a protein that is implicated in the regulation of axonal transport. Here we demonstrate that PI3K activation by Reelin requires Src family kinase activity and depends on the Reelin-triggered interaction of Dab1 with the PI3K regulatory subunit p85alpha. Because the Dab1 phosphotyrosine binding domain can interact simultaneously with membrane lipids and with the intracellular domains of apolipoprotein E receptor 2 and very low density lipoprotein receptor, Dab1 is preferentially recruited to the neuronal plasma membrane, where it is phosphorylated. Efficient Dab1 phosphorylation and activation of the Reelin signaling cascade is impaired by cholesterol depletion of the plasma membrane. Using a neuronal migration assay, we also show that PI3K signaling is required for the formation of a normal cortical plate, a step that is dependent upon Reelin signaling.
|Volume expansion stimulates p72(syk) and p56(lyn) in skate erythrocytes.|
Musch, M W, et al.
J. Biol. Chem., 274: 7923-8 (1999) 1999
Hypotonic volume expansion of skate erythrocytes rapidly stimulates the tyrosine phosphorylation of band 3, the membrane protein thought to mediate the osmotically sensitive taurine efflux. Skate erythrocytes possess numerous tyrosine kinases including p59fyn, p56lyn, pp60(src), and p72(syk), demonstrated by immune complex assays measuring autocatalytic kinase activity. Inclusion of the cytoplasmic domain of band 3 in this assay showed that only Syk and Lyn can directly phosphorylate the cytoplasmic domain of band 3. Upon cell volume expansion, Syk activity was increased as assessed by three different assays (immune complex assay measuring autophosphorylation, assay of the level of phosphotyrosine of the immunoprecipitated kinase, and assay of level of 32P in the kinase immunoprecipitated from cells prelabeled with 32PO4 and then volume-expanded). The tyrosine kinase Lyn was also stimulated by volume expansion, most notably when analyzed by the latter two methods. Volume expansion stimulated a large increase in the ability of Syk to phosphorylate band 3 at times that coincide with the stimulation of taurine flux. The stilbene piceatannol inhibited Syk preferentially over Lyn and other tyrosine kinases and inhibited volume-stimulated taurine efflux in a concentration-dependent manner similar to that for the inhibition of Syk. Two major phosphorylation peaks were detected in tryptic digests of cdb3 separated by reverse phase HPLC. Edman degradation demonstrated a phosphotyrosine in a YXXL motif. In conclusion, p72(syk) appears to be a strong candidate as a pivotal signal-transducing step in the volume-activated taurine efflux in skate red cells. The level of band-3 phosphorylation may be regulated, in addition, by a protein-tyrosine phosphatase of the 1B variety.
|Direct interaction in T-cells between thetaPKC and the tyrosine kinase p59fyn|
Ron, D., et al
J Biol Chem, 274:19003-10 (1999) 1999
|A requirement for caveolin-1 and associated kinase Fyn in integrin signaling and anchorage-dependent cell growth|
Wary, K. K., et al
Cell, 94:625-34 (1998) 1998
|Binding of src-like kinases to the beta-subunit of the interleukin-3 receptor|
Burton, E. A., et al
J Biol Chem, 272:16189-95 (1997) 1997
|The unique domain as the site on Lyn kinase for its constitutive association with the high affinity receptor for IgE.|
Vonakis, B M, et al.
J. Biol. Chem., 272: 24072-80 (1997) 1997
Aggregation of the high affinity receptor for IgE (FcepsilonRI) leads to the phosphorylation of tyrosines on the beta and gamma chains of the receptor by the Src family kinase Lyn. We have studied the interaction between Lyn and the FcepsilonRI in vivo using a transfection-based approach. FcepsilonRI were stably transfected into Chinese hamster ovary cells. The small amount of endogenous Src family kinase was sufficient to phosphorylate receptor tyrosines upon extensive aggregation of FcepsilonRI but not after addition of dimers of IgE. Upon stable co-transfection of Lyn kinase into the cells, dimers were now able to stimulate receptor phosphorylation and the response to more extensive aggregation was enhanced. In contrast, co-transfection with catalytically inactive Lyn inhibited the aggregation-induced phosphorylation by the endogenous kinase, and a quantitatively similar inhibition was observed in cells transfected with the SH4-containing unique domain of Lyn. Consistent with the results of others using alternative approaches, our additional studies using a yeast two-hybrid system detected a direct interaction between intact Lyn or its unique domain and the C-terminal cytoplasmic domain of the beta chain but not with the receptor's other cytoplasmic domains.