We are analyzing https://link.springer.com/article/10.1007/s11010-011-1155-0.

Title:
Intracellular trafficking and secretion of mouse mesencephalic astrocyte-derived neurotrophic factor | Molecular and Cellular Biochemistry
Description:
Recently, mesencephalic astrocyte-derived neurotrophic factor (MANF) has been reported to prevent cell death under some pathophysiological conditions. MANF, also referred to as arginine rich, mutated in early stage of tumors (Armet), was identified as an endoplasmic reticulum (ER) stress-inducible factor. Using RT-PCR, we found two variants of MANF mRNA: wild type, which contains exon 1 (wt-MANF), and one lacking exon 1, which is presumably not secreted (ΔΝ-MANF) in Neuro2a cells. The latter has a putative translational start site upstream of the second exon in the mouse MANF gene. Comparing the expression of wt-MANF with that of ΔΝ-MANF, we found that the amount of intracellular ΔΝ-MANF was much lower than that of wt-MANF. Furthermore, ΔΝ-MANF was not detected in the culture medium after its transient transfection into Neuro2a cells. Deletion of several α-helices of mouse MANF decreased its intracellular stability and secretion. Secretion of wt-MANF was almost completely inhibited by either treatment with brefeldin A (BFA), which disrupts the Golgi apparatus structure, or overexpression of a dominant negative Sar1 (Sar1[H79G]), which is reported to impair COPII-mediated transport from the ER to the Golgi apparatus. In addition, the enforced expression of glucose-regulated protein 78 kDa (GRP78) attenuated the secretion of wt-MANF and led to its intracellular accumulation. MANF lacking the four C-terminal amino acids (ΔC-MANF) accumulated at low levels in the cells, but its intracellular level was increased by GRP78 overexpression. The amount of ΔC-MANF in the culture medium was partially down-regulated after co-transfection of GRP78. Substitution of the amino acids RTDL at the C-terminus of mouse MANF with KDEL, the canonical ER localization signal in GRP78, markedly decreased MANF secretion and its secretion was further attenuated by GRP78 overexpression. Taken together, our data show that the secretion of MANF is regulated via COPII-mediated transport and that its C-terminus could be responsible for its retention in the ER through GRP78. The alternate isotype, ΔΝ-MANF, may be less stable in cells than wt-MANF and may not be secreted extracellularly.
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Keywords {🔍}

article, pubmed, google, scholar, cas, cell, manf, factor, neurotrophic, protein, secretion, endoplasmic, mesencephalic, astrocytederived, reticulum, grp, intracellular, mouse, ohhashi, stress, biol, death, armet, wtmanf, cells, access, nature, res, biochem, privacy, cookies, content, hirata, kiuchi, δνmanf, lindholm, mol, saarma, data, publish, research, search, november, tanaka, koga, gene, structure, sar, proteins, response,

Topics {✒️}

astrocyte-derived neurotrophic factor month download article/chapter endoplasmic-reticulum-resident kinase stress-inducible factor related subjects double-strand break repair 78-kda glucose-regulated protein glucose-regulated protein 78 kda c-terminal amino acids endoplasmic reticulum stress serum response factor arginine-rich protein gene impair copii-mediated transport unfolded protein response full article pdf privacy choices/manage cookies cellular biochemistry aims dominant negative sar1 luminal er proteins neurotrophic factors mouse manf gene amino acids rtdl aβ toxicity upr-upregulated protein protein-disulfide isomerase amyloid precursor protein mouse manf decreased copii-mediated transport copii vesicle formation article molecular endoplasmic reticulum endoplasmic reticulum mouse cysteine-rich prevent cell death european economic area rt-pcr check access incomplete trinucleotide repeat erse-ii element promotes behavioral recovery ku heterodimer bound short guided tour tiffany-castiglioni ea human pdi family instant access squamous cell carcinoma inhibits cell proliferation er stress protein-folding compartment golgi apparatus structure

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         headline:Intracellular trafficking and secretion of mouse mesencephalic astrocyte-derived neurotrophic factor
         description:Recently, mesencephalic astrocyte-derived neurotrophic factor (MANF) has been reported to prevent cell death under some pathophysiological conditions. MANF, also referred to as arginine rich, mutated in early stage of tumors (Armet), was identified as an endoplasmic reticulum (ER) stress-inducible factor. Using RT-PCR, we found two variants of MANF mRNA: wild type, which contains exon 1 (wt-MANF), and one lacking exon 1, which is presumably not secreted (ΔΝ-MANF) in Neuro2a cells. The latter has a putative translational start site upstream of the second exon in the mouse MANF gene. Comparing the expression of wt-MANF with that of ΔΝ-MANF, we found that the amount of intracellular ΔΝ-MANF was much lower than that of wt-MANF. Furthermore, ΔΝ-MANF was not detected in the culture medium after its transient transfection into Neuro2a cells. Deletion of several α-helices of mouse MANF decreased its intracellular stability and secretion. Secretion of wt-MANF was almost completely inhibited by either treatment with brefeldin A (BFA), which disrupts the Golgi apparatus structure, or overexpression of a dominant negative Sar1 (Sar1[H79G]), which is reported to impair COPII-mediated transport from the ER to the Golgi apparatus. In addition, the enforced expression of glucose-regulated protein 78 kDa (GRP78) attenuated the secretion of wt-MANF and led to its intracellular accumulation. MANF lacking the four C-terminal amino acids (ΔC-MANF) accumulated at low levels in the cells, but its intracellular level was increased by GRP78 overexpression. The amount of ΔC-MANF in the culture medium was partially down-regulated after co-transfection of GRP78. Substitution of the amino acids RTDL at the C-terminus of mouse MANF with KDEL, the canonical ER localization signal in GRP78, markedly decreased MANF secretion and its secretion was further attenuated by GRP78 overexpression. Taken together, our data show that the secretion of MANF is regulated via COPII-mediated transport and that its C-terminus could be responsible for its retention in the ER through GRP78. The alternate isotype, ΔΝ-MANF, may be less stable in cells than wt-MANF and may not be secreted extracellularly.
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      headline:Intracellular trafficking and secretion of mouse mesencephalic astrocyte-derived neurotrophic factor
      description:Recently, mesencephalic astrocyte-derived neurotrophic factor (MANF) has been reported to prevent cell death under some pathophysiological conditions. MANF, also referred to as arginine rich, mutated in early stage of tumors (Armet), was identified as an endoplasmic reticulum (ER) stress-inducible factor. Using RT-PCR, we found two variants of MANF mRNA: wild type, which contains exon 1 (wt-MANF), and one lacking exon 1, which is presumably not secreted (ΔΝ-MANF) in Neuro2a cells. The latter has a putative translational start site upstream of the second exon in the mouse MANF gene. Comparing the expression of wt-MANF with that of ΔΝ-MANF, we found that the amount of intracellular ΔΝ-MANF was much lower than that of wt-MANF. Furthermore, ΔΝ-MANF was not detected in the culture medium after its transient transfection into Neuro2a cells. Deletion of several α-helices of mouse MANF decreased its intracellular stability and secretion. Secretion of wt-MANF was almost completely inhibited by either treatment with brefeldin A (BFA), which disrupts the Golgi apparatus structure, or overexpression of a dominant negative Sar1 (Sar1[H79G]), which is reported to impair COPII-mediated transport from the ER to the Golgi apparatus. In addition, the enforced expression of glucose-regulated protein 78 kDa (GRP78) attenuated the secretion of wt-MANF and led to its intracellular accumulation. MANF lacking the four C-terminal amino acids (ΔC-MANF) accumulated at low levels in the cells, but its intracellular level was increased by GRP78 overexpression. The amount of ΔC-MANF in the culture medium was partially down-regulated after co-transfection of GRP78. Substitution of the amino acids RTDL at the C-terminus of mouse MANF with KDEL, the canonical ER localization signal in GRP78, markedly decreased MANF secretion and its secretion was further attenuated by GRP78 overexpression. Taken together, our data show that the secretion of MANF is regulated via COPII-mediated transport and that its C-terminus could be responsible for its retention in the ER through GRP78. The alternate isotype, ΔΝ-MANF, may be less stable in cells than wt-MANF and may not be secreted extracellularly.
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         Cancer Research
         Medical Biochemistry
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