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Lipoxygenase activity in the brain regions of young chicks: Isolation and some properties
Year:
1992
Authors :
Greenberg-Levy, Sima H.
;
.
Volume :
24
Co-Authors:
Greenberg-Levy, S.H., Department of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel [Tel. 972-3-5318212
Fax 972-3-771088]
Budowski, P., Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Grossman, S., Department of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel [Tel. 972-3-5318212
Facilitators :
From page:
1607
To page:
1614
(
Total pages:
8
)
Abstract:
1. 1. The lipoxygenase (LOX) oxygenation pathway of arachidonic acid was investigated in the cerebellum and cerebral hemispheres of young chicks. 2. 2. Lipoxygenase products consisted mainly of 15-hydroxyeicosatetraenoic acid (15-HETE), accompanied by the 15-hydroperoxy analog (15-HPETE) and the 5-HETE product. 3. 3. The yield of 15-HETE was 3 times greater in the cerebellar system than in the cerebrum. 4. 4. PLA2 activity of the cerbellum was twice that of the cerebrum. 5. 5. Affinity chromatography revealed 2 brain fractions with LOX activity which were assayed with either linoleic or arachidonic acid as substrate. 6. 6. The fraction eluted with 0.2 M sodium acetate pH 5.0, produced a higher yield and enrichment of LOX activity than the eluate obtained with 0.1 M Tris-HCl buffer (pH 8.0). 7. 7. A considerably higher yield and enrichment of the enzyme was achieved when the starting material was the cerebellum, compared to the cerebrum. 8. 8. The optimal pH for both purified fractions from cerebrum and cerebellum was 6.5, with either linoleic or arachidonic acid as substrate. 9. 9. The cerebral LOX yielded Michaelis-Menten kinetics when linoleic acid was the substrate, while the corresponding plots for the cerebellar enzyme were sigmoidal. 10. 10. Arachidonic acid as substrate produced sigmoidal plots, except at pH 5.0, where Michaelis-Menten kinetics were observed. 11. 11. These results and the elevated activities of PLA; and 15-LOX could be significant in relation to the special vulnerability of the cerebellum in chick nutritional encephalomalacia. © 1992.
Note:
Related Files :
5 hydroxyicosatetraenoic acid
Animal
animal tissue
Chickens
Male
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More details
DOI :
10.1016/0020-711X(92)90177-3
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21289
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:42
Scientific Publication
Lipoxygenase activity in the brain regions of young chicks: Isolation and some properties
24
Greenberg-Levy, S.H., Department of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel [Tel. 972-3-5318212
Fax 972-3-771088]
Budowski, P., Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76100, Israel
Grossman, S., Department of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel [Tel. 972-3-5318212
Lipoxygenase activity in the brain regions of young chicks: Isolation and some properties
1. 1. The lipoxygenase (LOX) oxygenation pathway of arachidonic acid was investigated in the cerebellum and cerebral hemispheres of young chicks. 2. 2. Lipoxygenase products consisted mainly of 15-hydroxyeicosatetraenoic acid (15-HETE), accompanied by the 15-hydroperoxy analog (15-HPETE) and the 5-HETE product. 3. 3. The yield of 15-HETE was 3 times greater in the cerebellar system than in the cerebrum. 4. 4. PLA2 activity of the cerbellum was twice that of the cerebrum. 5. 5. Affinity chromatography revealed 2 brain fractions with LOX activity which were assayed with either linoleic or arachidonic acid as substrate. 6. 6. The fraction eluted with 0.2 M sodium acetate pH 5.0, produced a higher yield and enrichment of LOX activity than the eluate obtained with 0.1 M Tris-HCl buffer (pH 8.0). 7. 7. A considerably higher yield and enrichment of the enzyme was achieved when the starting material was the cerebellum, compared to the cerebrum. 8. 8. The optimal pH for both purified fractions from cerebrum and cerebellum was 6.5, with either linoleic or arachidonic acid as substrate. 9. 9. The cerebral LOX yielded Michaelis-Menten kinetics when linoleic acid was the substrate, while the corresponding plots for the cerebellar enzyme were sigmoidal. 10. 10. Arachidonic acid as substrate produced sigmoidal plots, except at pH 5.0, where Michaelis-Menten kinetics were observed. 11. 11. These results and the elevated activities of PLA; and 15-LOX could be significant in relation to the special vulnerability of the cerebellum in chick nutritional encephalomalacia. © 1992.
Scientific Publication
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