Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid
Fluctuations in kynurenic acid (KYNA) and brain-derived neurotrophic factor (BDNF) levels in the brain reflect its neurological status. The aim of the study was to investigate the effect of transiently elevated KYNA concentrations in the cerebroventricular circulation on the expression of BDNF and i...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
|
| Series: | Cells |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4409/13/23/1928 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846124371549093888 |
|---|---|
| author | Katarzyna Roszkowicz-Ostrowska Patrycja Młotkowska Elżbieta Marciniak Michał Szlis Marcin Barszcz Tomasz Misztal |
| author_facet | Katarzyna Roszkowicz-Ostrowska Patrycja Młotkowska Elżbieta Marciniak Michał Szlis Marcin Barszcz Tomasz Misztal |
| author_sort | Katarzyna Roszkowicz-Ostrowska |
| collection | DOAJ |
| description | Fluctuations in kynurenic acid (KYNA) and brain-derived neurotrophic factor (BDNF) levels in the brain reflect its neurological status. The aim of the study was to investigate the effect of transiently elevated KYNA concentrations in the cerebroventricular circulation on the expression of BDNF and its high-affinity tropomyosin-related kinase receptor B (TrkB) in specific structures of the sheep brain. Intracerebroventricularly cannulated anestrous sheep were subjected to a series of four 30 min infusions of KYNA: 4 × 5 μg/60 μL/30 min (KYNA20, <i>n</i> = 6) and 4 × 25 μg/60 μL/30 min (KYNA100, <i>n</i> = 6) or a control infusion (<i>n</i> = 6), at 30 min intervals. Sections of the hippocampal CA3 field, amygdala (AMG), prefrontal cortex (PCx), and the hypothalamic medial-basal (MBH) and preoptic (POA) areas were dissected from the brain immediately after the experiment. The highest concentration of BDNF protein was found in the CA3 field (<i>p</i> < 0.001), which was 8-fold higher than in the AMG and 12-fold higher than that in the PCx (MBH and POA were not analyzed). The most pronounced BDNF mRNA expression was observed in the MBH, followed by the PCx, POA, AMG and CA3, while the highest abundance of TrkB mRNA was recorded in the AMG, followed by the MBH, PCx, CA3, and POA. KYNA increased (<i>p</i> < 0.05–<i>p</i> < 0.01) BDNF protein levels and the expression of its gene in the brain structures were examined, with the effect varying by dose and brain region. KYNA, particularly at the KYNA100 dose, also increased (<i>p</i> < 0.01) <i>TrkB</i> gene expression, except for the AMG, where the lower KYNA20 dose was more effective (<i>p</i> < 0.01). These findings suggest a positive relationship between KYNA levels in the cerebroventricular circulation and BDNF–TrkB expression in specific brain regions in a sheep model. This indicates that a transient increase in the CSF KYNA concentration can potentially restore BDNF production, for which deficiency underlies numerous neurological disorders. |
| format | Article |
| id | doaj-art-827ca9c9e9ff4b63a6cd729b2786ad0d |
| institution | Kabale University |
| issn | 2073-4409 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Cells |
| spelling | doaj-art-827ca9c9e9ff4b63a6cd729b2786ad0d2024-12-13T16:24:02ZengMDPI AGCells2073-44092024-11-011323192810.3390/cells13231928Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic AcidKatarzyna Roszkowicz-Ostrowska0Patrycja Młotkowska1Elżbieta Marciniak2Michał Szlis3Marcin Barszcz4Tomasz Misztal5The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3 Str., 05-110 Jabłonna, PolandThe Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3 Str., 05-110 Jabłonna, PolandThe Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3 Str., 05-110 Jabłonna, PolandThe Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3 Str., 05-110 Jabłonna, PolandThe Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3 Str., 05-110 Jabłonna, PolandThe Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka 3 Str., 05-110 Jabłonna, PolandFluctuations in kynurenic acid (KYNA) and brain-derived neurotrophic factor (BDNF) levels in the brain reflect its neurological status. The aim of the study was to investigate the effect of transiently elevated KYNA concentrations in the cerebroventricular circulation on the expression of BDNF and its high-affinity tropomyosin-related kinase receptor B (TrkB) in specific structures of the sheep brain. Intracerebroventricularly cannulated anestrous sheep were subjected to a series of four 30 min infusions of KYNA: 4 × 5 μg/60 μL/30 min (KYNA20, <i>n</i> = 6) and 4 × 25 μg/60 μL/30 min (KYNA100, <i>n</i> = 6) or a control infusion (<i>n</i> = 6), at 30 min intervals. Sections of the hippocampal CA3 field, amygdala (AMG), prefrontal cortex (PCx), and the hypothalamic medial-basal (MBH) and preoptic (POA) areas were dissected from the brain immediately after the experiment. The highest concentration of BDNF protein was found in the CA3 field (<i>p</i> < 0.001), which was 8-fold higher than in the AMG and 12-fold higher than that in the PCx (MBH and POA were not analyzed). The most pronounced BDNF mRNA expression was observed in the MBH, followed by the PCx, POA, AMG and CA3, while the highest abundance of TrkB mRNA was recorded in the AMG, followed by the MBH, PCx, CA3, and POA. KYNA increased (<i>p</i> < 0.05–<i>p</i> < 0.01) BDNF protein levels and the expression of its gene in the brain structures were examined, with the effect varying by dose and brain region. KYNA, particularly at the KYNA100 dose, also increased (<i>p</i> < 0.01) <i>TrkB</i> gene expression, except for the AMG, where the lower KYNA20 dose was more effective (<i>p</i> < 0.01). These findings suggest a positive relationship between KYNA levels in the cerebroventricular circulation and BDNF–TrkB expression in specific brain regions in a sheep model. This indicates that a transient increase in the CSF KYNA concentration can potentially restore BDNF production, for which deficiency underlies numerous neurological disorders.https://www.mdpi.com/2073-4409/13/23/1928kynurenic acidintracerebroventricular infusionBDNFTrkBsheep brain |
| spellingShingle | Katarzyna Roszkowicz-Ostrowska Patrycja Młotkowska Elżbieta Marciniak Michał Szlis Marcin Barszcz Tomasz Misztal Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid Cells kynurenic acid intracerebroventricular infusion BDNF TrkB sheep brain |
| title | Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid |
| title_full | Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid |
| title_fullStr | Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid |
| title_full_unstemmed | Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid |
| title_short | Activation of BDNF–TrkB Signaling in Specific Structures of the Sheep Brain by Kynurenic Acid |
| title_sort | activation of bdnf trkb signaling in specific structures of the sheep brain by kynurenic acid |
| topic | kynurenic acid intracerebroventricular infusion BDNF TrkB sheep brain |
| url | https://www.mdpi.com/2073-4409/13/23/1928 |
| work_keys_str_mv | AT katarzynaroszkowiczostrowska activationofbdnftrkbsignalinginspecificstructuresofthesheepbrainbykynurenicacid AT patrycjamłotkowska activationofbdnftrkbsignalinginspecificstructuresofthesheepbrainbykynurenicacid AT elzbietamarciniak activationofbdnftrkbsignalinginspecificstructuresofthesheepbrainbykynurenicacid AT michałszlis activationofbdnftrkbsignalinginspecificstructuresofthesheepbrainbykynurenicacid AT marcinbarszcz activationofbdnftrkbsignalinginspecificstructuresofthesheepbrainbykynurenicacid AT tomaszmisztal activationofbdnftrkbsignalinginspecificstructuresofthesheepbrainbykynurenicacid |