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Hashemian, Sanaz
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Publications (10 of 12) Show all publications
Deplano, A., Morgillo, C. M., Demurtas, M., Björklund, E., Cipriano, M., Svensson, M., . . . Onnis, V. (2017). Novel propanamides as fatty acid amide hydrolase inhibitors. European Journal of Medicinal Chemistry, 136, 523-542
Open this publication in new window or tab >>Novel propanamides as fatty acid amide hydrolase inhibitors
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2017 (English)In: European Journal of Medicinal Chemistry, ISSN 0223-5234, E-ISSN 1768-3254, Vol. 136, p. 523-542Article in journal (Refereed) Published
Abstract [en]

Fatty acid amide hydrolase (FAAH) has a key role in the control of the cannabinoid signaling, through the hydrolysis of the endocannabinoids anandamide and in some tissues 2-arachidonoylglycerol. FAAH inhibition represents a promising strategy to activate the cannabinoid system, since it does not result in the psychotropic and peripheral side effects characterizing the agonists of the cannabinoid receptors. Here we present the discovery of a novel class of profen derivatives, the N-(heteroary1)-2-(4(2-(trifluoromethyl)pyridin-4-y0amino)phenyl)propanamides, as FAAH inhibitors. Enzymatic assays showed potencies toward FAAH ranging from nanomolar to micromolar range, and the most compounds lack activity toward the two isoforms of cyclooxygenase. Extensive structure-activity studies and the definition of the binding mode for the lead compound of the series are also presented. Kinetic assays in rat and mouse FAAH on selected compounds of the series demonstrated that slight modifications of the chemical structure could influence the binding mode and give rise to competitive (TPA1) or noncompetitive (TPA14) inhibition modes.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
FAAH inhibitors, Heteroaryl propanamides, Fatty acid amide hydrolase, Endocannabinoids, Anandamide
National Category
Pharmacology and Toxicology
Identifiers
urn:nbn:se:umu:diva-137605 (URN)10.1016/j.ejmech.2017.05.033 (DOI)000403993500045 ()28535469 (PubMedID)
Available from: 2017-07-10 Created: 2017-07-10 Last updated: 2018-06-09Bibliographically approved
Gouveia-Figueira, S., Goldin, K., Hashemian, S. A., Lindberg, A., Persson, M., Nording, M. L., . . . Fowler, C. J. (2017). Plasma levels of the endocannabinoid anandamide, related N-acylethanolamines and linoleic acid-derived oxylipins in patients with migraine. Prostaglandins, Leukotrienes and Essential Fatty Acids, 120, 15-24
Open this publication in new window or tab >>Plasma levels of the endocannabinoid anandamide, related N-acylethanolamines and linoleic acid-derived oxylipins in patients with migraine
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2017 (English)In: Prostaglandins, Leukotrienes and Essential Fatty Acids, ISSN 0952-3278, E-ISSN 1532-2823, Vol. 120, p. 15-24Article in journal (Refereed) Published
Abstract [en]

There is evidence that patients with migraine have deficient levels of the endogenous cannabinoid receptor ligand anandamide (AEA). It is not known, however, if this is a localised or generalised phenomenon. In the present study, levels of AEA, related N-acylethanolamines (NAEs) and linoleic acid-derived oxylipins have been measured in the blood of 26 healthy women and 38 women with migraine (26 with aura, 12 without aura) who were matched for age and body-mass index. Blood samples were taken on two occasions: the first sample near the start of the menstrual cycle (when present) and the second approximately fourteen days later. For a subset of migraine patients, two additional blood samples were taken, one during a migraine attack and one approximately 1 month later (to be at the same stage in the menstrual cycle, when present). NAEs and oxylipins were measured by liquid chromatography coupled to mass spectrometry. Twenty-nine lipids were quantified, of which 16 were found to have a high reproducibility of measurement. There were no significant differences in the levels of AEA, the related NAEs stearoylethanolamide and oleoylethanolamide or any of the nine linoleic acid derived oxylipins measured either between migraine patients with vs. without aura, or between controls and migraine patients (after stratification to take into account whether or not the individuals had regular menstruation cycles) in either of the first two samples. Levels of linoleoylethanolamide were lower in the patients with vs. without aura on the second sample but not in the first sample, but the biological importance of this fording is unclear. Due to time-dependent increases in their concentrations ex vivo prior to centrifugation, AEA and oleoylethanolamide levels in the samples collected during migraine attacks were not analysed, but for the other fourteen lipids, there were no significant differences in plasma concentrations during migraine vs. one month later. It is concluded that migraine is not associated with a generalised (as opposed to localised) deficiency in these lipids.

Keywords
Migraine, Endocannabinoid, Anandamide, Stearoylethanolamide, Linoleoylethanolamide, Oxylipin, 9- droxy-10E, 12Z-octadecadienoic acid, Blood plasma
National Category
Other Clinical Medicine
Identifiers
urn:nbn:se:umu:diva-138050 (URN)10.1016/j.plefa.2017.04.005 (DOI)000405880800003 ()28515018 (PubMedID)
Available from: 2017-08-11 Created: 2017-08-11 Last updated: 2018-06-09Bibliographically approved
Hashemian, S., Alhouayek, M. & Fowler, C. J. (2017). TLR4 receptor expression and function in F11 dorsal root ganglion x neuroblastoma hybrid cells. Innate Immunity, 23(8), 687-696
Open this publication in new window or tab >>TLR4 receptor expression and function in F11 dorsal root ganglion x neuroblastoma hybrid cells
2017 (English)In: Innate Immunity, ISSN 1753-4259, E-ISSN 1753-4267, Vol. 23, no 8, p. 687-696Article in journal (Refereed) Published
Abstract [en]

TLR4 respond to bacterial LPS to produce inflammatory cytokines. TLR4 are expressed in dorsal root ganglia and play a role in pain. F11 dorsal root ganglia x mouse neuroblastoma cells possess many of the properties seen in nociceptive dorsal root ganglia neuronal cells. Here, we investigated the effect of 2h and 6h treatment with LPS upon the expression of inflammatory proteins in undifferentiated and differentiated F11 cells. The cells expressed mRNA for TRL4 (mouse, not rat) and proteins involved in TLR4 signaling. TLR4 expression was confirmed using immunohistochemistry. LPS produced modest increases in mouse and rat IL-6 and in mouse cyclooxygenase-2 levels in undifferentiated cells, but did not significantly affect mouse TNF- expression. This contrasts with the robust effects of LPS upon cyclooxygenase-2 expression in cultured dorsal root ganglia neurons. F11 cells expressed the endocannabinoid metabolizing enzymes fatty acid amide hydrolase and N-acylethanolamine acid amidase (both murine), which were functionally active. These data suggest that F11 cells are not a useful model for the study of LPS-mediated effects but may be useful for the study of endocannabinoid catabolism.

Keywords
Lipopolysaccharide, F11 cells, dorsal root ganglia, TLR4, cyclooxygenase-2, interleukin-6, fatty acid ide hydrolase, N-acylethanolamine hydrolysing acid amidase
National Category
Immunology
Identifiers
urn:nbn:se:umu:diva-142261 (URN)10.1177/1753425917732824 (DOI)000414901300006 ()
Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2018-06-09Bibliographically approved
Popova, D., Forsblad, A., Hashemian, S. & Jacobsson, S. O. P. (2016). Non-Serotonergic Neurotoxicity by MDMA (Ecstasy) in Neurons Derived from Mouse P19 Embryonal Carcinoma Cells. PLoS ONE, 11(11), Article ID e0166750.
Open this publication in new window or tab >>Non-Serotonergic Neurotoxicity by MDMA (Ecstasy) in Neurons Derived from Mouse P19 Embryonal Carcinoma Cells
2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 11, article id e0166750Article in journal (Refereed) Published
Abstract [en]

3,4-methylenedioxymethamphetamine (MDMA; ecstasy) is a commonly abused recreational drug that causes neurotoxic effects in both humans and animals. The mechanism behind MDMA-induced neurotoxicity is suggested to be species-dependent and needs to be further investigated on the cellular level. In this study, the effects of MDMA in neuronally differentiated P19 mouse embryonal carcinoma cells have been examined. MDMA produces a concentration-, time- and temperature-dependent toxicity in differentiated P19 neurons, as measured by intracellular MTT reduction and extracellular LDH activity assays. The P19-derived neurons express both the serotonin reuptake transporter (SERT), that is functionally active, and the serotonin metabolizing enzyme monoamine oxidase A (MAO-A). The involvement of these proteins in the MDMA-induced toxicity was investigated by a pharmacological approach. The MAO inhibitors clorgyline and deprenyl, and the SERT inhibitor fluoxetine, per se or in combination, were not able to mimic the toxic effects of MDMA in the P19-derived neurons or block the MDMA-induced cell toxicity. Oxidative stress has been implicated in MDMA-induced neurotoxicity, but pre-treatment with the antioxidants α-tocopherol or N-acetylcysteine did not reveal any protective effects in the P19 neurons. Involvement of mitochondria in the MDMA-induced cytotoxicity was also examined, but MDMA did not alter the mitochondrial membrane potential (ΔΨm) in the P19 neurons. We conclude that MDMA produce a concentration-, time- and temperature-dependent neurotoxicity and our results suggest that the mechanism behind MDMA-induced toxicity in mouse-derived neurons do not involve the serotonergic system, oxidative stress or mitochondrial dysfunction.

National Category
Pharmacology and Toxicology
Research subject
Toxicology
Identifiers
urn:nbn:se:umu:diva-128533 (URN)10.1371/journal.pone.0166750 (DOI)000388350300099 ()27861613 (PubMedID)
Available from: 2016-12-06 Created: 2016-12-06 Last updated: 2018-06-09Bibliographically approved
Gouveia-Figueira, S., Karlsson, J., Deplano, A., Hashemian, S., Svensson, M., Fredriksson Sundbom, M., . . . Fowler, C. J. (2015). Characterisation of (R)-2-(2-Fluorobiphenyl-4-yl)-N-(3-Methylpyridin-2-yl)Propanamide as a Dual Fatty Acid Amide Hydrolase: Cyclooxygenase Inhibitor. PLoS ONE, 10(9), Article ID e0139212.
Open this publication in new window or tab >>Characterisation of (R)-2-(2-Fluorobiphenyl-4-yl)-N-(3-Methylpyridin-2-yl)Propanamide as a Dual Fatty Acid Amide Hydrolase: Cyclooxygenase Inhibitor
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2015 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 10, no 9, article id e0139212Article in journal (Refereed) Published
Abstract [en]

Background Increased endocannabinoid tonus by dual-action fatty acid amide hydrolase (FAAH) and substrate selective cyclooxygenase (COX-2) inhibitors is a promising approach for pain-relief. One such compound with this profile is 2-(2-fluorobiphenyl-4-yl)-N-(3-methylpyridin-2-yl)propanamide (Flu-AM1). These activities are shown by Flu-AM1 racemate, but it is not known whether its two single enantiomers behave differently, as is the case towards COX-2 for the parent flurbiprofen enantiomers. Further, the effects of the compound upon COX-2-derived lipids in intact cells are not known. Methodology/Principal Findings COX inhibition was determined using an oxygraphic method with arachidonic acid and 2-arachidonoylglycerol (2-AG) as substrates. FAAH was assayed in mouse brain homogenates using anandamide (AEA) as substrate. Lipidomic analysis was conducted in unstimulated and lipopolysaccharide + interferon gamma-stimulated RAW 264.7 macrophage cells. Both enantiomers inhibited COX-2 in a substrate-selective and time-dependent manner, with IC50 values in the absence of a preincubation phase of: (R)-Flu-AM1, COX-1 (arachidonic acid) 6 mu M; COX-2 (arachidonic acid) 20 mu M; COX-2 (2-AG) 1 mu M; (S)-Flu-AM1, COX-1 (arachidonic acid) 3 mu M; COX-2 (arachidonic acid) 10 mu M; COX-2 (2-AG) 0.7 mu M. The compounds showed no enantiomeric selectivity in their FAAH inhibitory properties. (R)-Flu-AM1 (10 mu M) greatly inhibited the production of prostaglandin D2 and E2 in both unstimulated and lipopolysaccharide + interferon.-stimulated RAW 264.7 macrophage cells. Levels of 2-AG were not affected either by (R)-Flu-AM1 or by 10 mu M flurbiprofen, either alone or in combination with the FAAH inhibitor URB597 (1 mu M). Conclusions/Significance Both enantiomers of Flu-AM1 are more potent inhibitors of 2-AG compared to arachidonic acid oxygenation by COX-2. Inhibition of COX in lipopolysaccharide + interferon.-stimulated RAW 264.7 cells is insufficient to affect 2-AG levels despite the large induction of COX-2 produced by this treatment.

National Category
Pharmacology and Toxicology
Identifiers
urn:nbn:se:umu:diva-110569 (URN)10.1371/journal.pone.0139212 (DOI)000361800700192 ()26406890 (PubMedID)
Available from: 2015-11-06 Created: 2015-10-23 Last updated: 2018-06-07Bibliographically approved
Hashemian, S., O'Rourke, C., Phillips, J. B., Strömberg, I. & af Bjerkén, S. (2015). Embryonic and mature astrocytes exert different effects on neuronal growth in rat ventral mesencephalic slice cultures. SpringerPlus, 4, Article ID 558.
Open this publication in new window or tab >>Embryonic and mature astrocytes exert different effects on neuronal growth in rat ventral mesencephalic slice cultures
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2015 (English)In: SpringerPlus, E-ISSN 2193-1801, Vol. 4, article id 558Article in journal (Refereed) Published
Abstract [en]

One obstacle with grafting of dopamine neurons in Parkinson's disease is the insufficient ability of the transplant to reinnervate the host striatum. Another issue is the prospective interaction between the donor fetal tissue and the adult astrocytes of the host. To study nerve fiber growth and its interaction with immature/mature astrocytes, ventral mesencephalic (VM) organotypic rat tissue cultures from embryonic days (E) 12, E14, and E18 were studied up to 35 days in vitro (DIV), and co-cultures of E14 VM tissue and mature green fluorescent protein (GFP)-positive astrocytes were performed. Generally, nerve fibers grew from the tissue slice either in association with a monolayer of migrated astroglia surrounding the tissue (glial-associated), or distal to the astroglia as non-glial-associated outgrowth. The tyrosine hydroxylase (TH)-positive glial-associated nerve fiber outgrowth reached a plateau at 21 DIV in E12 and E14 cultures. In E18 cultures, TH-positive neurons displayed short processes and migrated onto the astrocytes. While the non-glial-associated nerve fiber outgrowth dominated the E14 cultures, it was found absent in E18 cultures. The GFP-positive cells in the VM and GFP-positive astrocyte co-cultures were generally located distal to the monolayer of migrated fetal astrocytes, a few GFP-positive cells were however observed within the astrocytic monolayer. In those cases TH-positive neurons migrated towards the GFP-positive cells. Both the non-glial-and glial-associated nerve fibers grew onto the GFP-positive cells. Taken together, the glial-associated growth has limited outgrowth compared to the non-glial-associated nerve fibers, while none of the outgrowth types were hampered by the mature astrocytes.

Keywords
Organotypic culture, Ventral mesencephalon, Mature astrocytes, Developmental stages
National Category
Cell and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-110567 (URN)10.1186/s40064-015-1362-3 (DOI)000361917700003 ()26435904 (PubMedID)
Available from: 2015-11-06 Created: 2015-10-23 Last updated: 2018-06-07Bibliographically approved
Hashemian, S., Marschinke, F., af Bjerkén, S. & Strömberg, I. (2014). Degradation of proteoglycans affects astrocytes and neurite formation in organotypic tissue cultures. Brain Research, 1564, 22-32
Open this publication in new window or tab >>Degradation of proteoglycans affects astrocytes and neurite formation in organotypic tissue cultures
2014 (English)In: Brain Research, ISSN 0006-8993, E-ISSN 1872-6240, Vol. 1564, p. 22-32Article in journal (Refereed) Published
Abstract [en]

Chondroitin sulfate proteoglycans (CSPGs) promote nerve growth during development, and inhibit axonal growth in the adult CNS after injury. Chondroitinase ABC (ChABC) and methyl-umbelliferyl-β-d-xyloside (β-xyloside), two enzymes that degrade CSPGs, promote regeneration after injury, however, they demonstrate opposing results in tissue culture. To elucidate the effect of the two enzymes, organotypic tissue cultures, treated with ChABC or β-xyloside, were employed to monitor nerve fiber outgrowth and astrocytic migration. Rat ventral mesencephalon (VM) and spinal cord (SC) from embryonic day (E) 14 and E18 were treated early, from the plating day for 14 days in vitro, or late where treatment was initiated after being cultured for 14 days. In the early treatment of E14 VM and SC cultures, astrocytic migration and nerve fiber outgrowth were hampered using both enzymes. Early treatment of E18 cultures reduced the astrocytic migration, while nerve growth was promoted by β-xyloside, but not by ChABC. In the late treated cultures of both E14 and E18 cultures, no differences in distances that astrocytes migrated or nerve fiber growth were observed. However, in β-xyloside-treated cultures, the confluency of astrocytic monolayer was disrupted. In E18 cultures both early and late treatments, neuronal migration was present in control cultures, which was preserved using ChABC but not β-xyloside. In conclusion, ChABC and β-xyloside had similar effects and hampered nerve fiber growth and astrocytic migration in E14 cultures. In E18 cultures nerve fiber growth was stimulated and neuronal migration was hampered after β-xyloside treatment while ChABC treatment did not exert these effects.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
CSPGs; Spinal cord; Ventral mesencephalon; ChABC; β-xyloside
National Category
Neurosciences
Identifiers
urn:nbn:se:umu:diva-87978 (URN)10.1016/j.brainres.2014.03.043 (DOI)000336703900003 ()
Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2018-06-08Bibliographically approved
Hashemian, S. (2014). Interaction between nerve fiber formation and astrocytes. (Doctoral dissertation). Umeå: Umeå Universitet
Open this publication in new window or tab >>Interaction between nerve fiber formation and astrocytes
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Parkinson’s disease, the second most common neurodegenerative disorder,is characterized by loss of nigrostriatal dopaminergic neurons. To date,there is no defined cause and cure for the disease. An ideal treatmentstrategy is to replace the lost neurons by transplanting fetal dopaminergicneurons to the brain of parkinsonian patients. Clinical trials have beenperformed and the outcome was variable where one significant obstaclewas the limited graft reinnervation of the host brain. To study this issue,organotypic tissue culture can be utilized to monitor dopaminergic nervefiber outgrowth in vitro and their association with astrocytes. Using thisculture technique, dopaminergic nerve fibers appear in twomorphologically and temporally different types. The early appearing nervefibers are formed in the absence of astrocytes, reach long distances, andare called non-glial-associated tyrosine hydroxylase (TH) -positive nervefibers. After a few days, the second sequence of nerve fibers, the glialassociatedTH-positive nerve fibers, are formed, and their growth arelimited to the presence of astrocytes, that migrate and form a monolayersurrounding the plated tissue. The aim of this thesis was to study theinteraction between nerve fiber formation and astrocytes with a specialfocus on the long-distance growing nerve fibers. Ventral mesencephalic(VM) organotypic slice cultures from embryonic day (E) 12, E14, and E18were incubated for 14, 21, 28, and 35 days in vitro (DIV). The resultsrevealed that the two morphologically different processes were found incultures from the younger stages, while no non-glial-associated growthwas found in cultures of tissue from E18. Instead neurons had migratedonto the migrating astrocytes. Astrocytes migrated longer distances intissue from older stages, and the migration reached a plateau at 21 DIV.Co-cultures of E14 VM tissue pieces and cell suspension of matureastrocytes promoted migration of neurons, as seen in E18 cultures. Thus,9the maturity of the astrocytes was an important factor for nerve fiberoutgrowth. Hence, targeting molecules secreted by astrocytes might bebeneficial for regeneration. Chondroitin sulfate proteoglycan (CSPG), amember of proteoglycan family, is produced by the astrocytes and has adual role of being permissive during development and inhibitory afterbrain injury in adult brain. Cultures were treated with chondroitinase ABC(ChABC) or methyl-umbelliferyl-β-D-xyloside (β-xyloside) in twodifferent protocols, early and late treatments. The results from the earlytreated cultures showed that both compounds inhibited the outgrowth ofnerve fibers and astrocytic migration in cultures from E14 tissue, while β-xyloside but not ChABC promoted the non-glial-associated growth incultures derived from E18 fetuses. In addition, β-xyloside but not ChABCinhibited neuronal migration in E18 cultures. Taken together, β-xylosideappeared more effective than ChABC in promoting nerve fiber growth.Another potential candidate, integrin-associated protein CD47, was studiedbecause of its role in synaptogenesis, which is important for nerve fibergrowth. Cultures from E14 CD47 knockout (CD47-/-) mice were plated andcompared to their wildtypes. CD47-/- cultures displayed a massive and longnon-glial-associated TH-positive nerve fiber outgrowth despite theirnormal astrocytic migration. Blocking either signal regulatory protein-α(SIRPα) or thrombospondin-1 (TSP-1), which bind to CD47, had nogrowth promoting effect. In conclusion, to promote nerve growth, youngertissue can grow for longer distances than older tissue, and inhibiting CSPGproduction promotes nerve growth in older tissue, while gene deletion ofCD47 makes the astrocytes permissive for a robust nerve fiber growth.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2014. p. 56
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 1650
Keywords
dopamine, nerve fiber outgrowth, astrocytes, ventral mesencephalon, spinal cord, CSPG, CD47
National Category
Neurosciences
Identifiers
urn:nbn:se:umu:diva-88366 (URN)978-91-7601-057-0 (ISBN)
Public defence
2014-05-28, BiA201, Biologihuset, Umeå Universitet, Umeå, 09:00 (English)
Opponent
Supervisors
Available from: 2014-05-07 Created: 2014-05-05 Last updated: 2018-06-07Bibliographically approved
Marschinke, F., Hashemian, S. A., Matozaki, T., Oldenborg, P.-A. & Strömberg, I. (2012). The absence of CD47 promotes nerve fiber growth from cultured ventral mesencephalic dopamine neurons. PLoS ONE, 7(9), e45218
Open this publication in new window or tab >>The absence of CD47 promotes nerve fiber growth from cultured ventral mesencephalic dopamine neurons
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2012 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, no 9, p. e45218-Article in journal (Refereed) Published
Abstract [en]

In ventral mesencephalic organotypic tissue cultures, two timely separated sequences of nerve fiber growth have been observed. The first appearing nerve fiber pattern is a long-distance outgrowth that occurs before astrocytes start to proliferate and migrate to form an astrocytic monolayer that finally surrounds the tissue slice. These long-distance growing nerve fibers are retracted as the astrocytes migrate, and are followed by a secondary outgrowth. The secondary outgrowth is persistent in time but reaches short distances, comparable with outgrowth seen from a dopaminergic graft implanted to the brain. The present study was focused on the interaction between the astrocytes and the long-distance growing non-glial associated nerve fibers. Cross talk between astroglia and neurite formation might occur through the integrin-associated protein CD47. CD47 serves as a ligand for signal regulatory protein (SIRP) alpha and as a receptor for the extracellular matrix protein thrombospondin-1 (TSP-1). Embryonic day 14 ventral mesencephalic tissue from CD47(+/+) and CD47(-/-) mice was used to investigate astrocytic migration and the tyrosine hydroxylase (TH) -positive outgrowth that occurred remote from the astrocytes. TH-immunohistochemistry demonstrated that the non-glial-associated nerve fiber outgrowth in CD47(-/-) cultures reached significantly longer distances and higher density compared to nerve fibers formed in CD47(+/+) cultures at 14 days in vitro. These nerve fibers often had a dotted appearance in CD47(+/+) cultures. No difference in the astrocytic migration was observed. Further investigations revealed that the presence of CD47 in control culture did neither hamper non-glial-associated growth through SIRP alpha nor through TSP-1 since similar outgrowth was found in SIRP alpha mutant cultures and in CD47(+/+) cultures treated with blocking antibodies against the TSP-1, respectively, as in the control cultures. In conclusion, long-distance growing nerve fiber formation is promoted by the absence of CD47, even though the presence of astrocytes is not inhibited.

Place, publisher, year, edition, pages
Public library of science, 2012
National Category
Cell Biology
Identifiers
urn:nbn:se:umu:diva-61571 (URN)10.1371/journal.pone.0045218 (DOI)000309517300019 ()
Available from: 2013-01-02 Created: 2012-11-20 Last updated: 2018-06-08Bibliographically approved
Hashemian, S. A., Marschinke, F., Oldenborg, P.-A. & Strömberg, I. (2011). Blocking cd47/ox101 makes the astrocytes permissive for nerve fiber growth. In: Glia: 10th European meeting on Glial Cells in Health and Disease. Paper presented at 10th European Meeting on Glial Cells in Health and Disease, 13-17 September, 2011 i Prag, Tjeckien (pp. S105-S106). New York, N.Y.: Wiley-Liss, Inc., 59
Open this publication in new window or tab >>Blocking cd47/ox101 makes the astrocytes permissive for nerve fiber growth
2011 (English)In: Glia: 10th European meeting on Glial Cells in Health and Disease, New York, N.Y.: Wiley-Liss, Inc. , 2011, Vol. 59, p. S105-S106Conference paper, Published paper (Refereed)
Abstract [en]

Crosstalk between astroglia and nerve fiber outgrowth might be an underlying mechanism for regeneration of nerve fibers and can be used in treatment of neurodegenerative diseases. This crosstalk might occur through the integrin-associated protein (CD47 in mouse or OX101 in rat), which serves as a ligand for signal regulatory protein-α (Sirpα) (P84/SHPS-1 in mouse or OX41 in rat), and as a receptor for thrombospondin (TSP). In the present study the localization of OX101 was assessed in organotypic tissue cultures from ventral mesencephalon (VM) of embryonic day (E) 14 rat fetuses, and its presence in astrocytes was observed. Thereafter, the effect of OX101 was blocked in E14 VM cultures by treatment with OX101 antibodies. A robust tyrosine hydroxylase (TH)- positive nerve fiber outgrowth was observed using immuohistochemistry. In addition, the neurons had migrated from the tissue slice. This result was in parallel with results achieved from E14 cultures of CD47 knockout mice, in which TH–positive nerve fiber growth was robust and independent of the presence of astrocytes, whilst in wildtype cultures nerve fibers were restricted to the astrocytes. Thus, these data demonstrate that CD47/OX101 can be an important molecule, which normally is produced by astrocytes and in its absence, the astrocytes become more permissive for nerve fiber growth.

Place, publisher, year, edition, pages
New York, N.Y.: Wiley-Liss, Inc., 2011
Series
Glia, ISSN 1098-1136 ; Vol. 59 Suppl. 1
Keywords
CD47; SIRPa; TSP
National Category
Neurosciences
Identifiers
urn:nbn:se:umu:diva-47371 (URN)
Conference
10th European Meeting on Glial Cells in Health and Disease, 13-17 September, 2011 i Prag, Tjeckien
Available from: 2011-09-26 Created: 2011-09-20 Last updated: 2018-06-08Bibliographically approved
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