» Articles » PMID: 33494373

Tryptophan Pathway Abnormalities in a Murine Model of Hereditary Glaucoma

Abstract

Background: It has been shown that a possible pathogenetic mechanism of neurodegeneration in the mouse model of glaucoma (DBA/2J) may be an alteration of kynurenic acid (KYNA) in the retina. This study aimed to verify the hypothesis that alterations of tryptophan (TRP) metabolism in DBA/2J mice is not limited to the retina.

Methods: Samples of the retinal tissue and serum were collected from DBA/2J mice (6 and 10 months old) and control C57Bl/6 mice of the same age. The concentration of TRP, KYNA, kynurenine (KYN), and 3-hydroxykynurenine (3OH-K) was measured by HPLC. The activity of indoleamine 2,3-dioxygenase (IDO) was also determined as a KYN/TRP ratio.

Results: TRP, KYNA, L-KYN, and 3OH-K concentration were significantly lower in the retinas of DBA/2J mice than in C57Bl/6 mice. 3OH-K concentration was higher in older mice in both strains. Serum TRP, L-KYN, and KYNA concentrations were lower in DBA/2J than in age-matched controls. However, serum IDO activity did not differ significantly between compared groups and strains.

Conclusions: Alterations of the TRP pathway seem not to be limited to the retina in the murine model of hereditary glaucoma.

Citing Articles

A Review on the Role and Function of Cinnabarinic Acid, a "Forgotten" Metabolite of the Kynurenine Pathway.

Gawel K Cells. 2024; 13(5.

PMID: 38474418 PMC: 10930587. DOI: 10.3390/cells13050453.


Efficacy of Continuous-Wave Transscleral Cyclophotocoagulation Post-Pars Plana Vitrectomy in Glaucoma Patients: A Retrospective Study from Poland.

Kuciel-Polczak I, Kawka-Osuch M, Krysik K, Dobrowolski D, Janiszewska-Bil D, Wylegala E Med Sci Monit. 2023; 29:e941770.

PMID: 38130054 PMC: 10750432. DOI: 10.12659/MSM.941770.


Association between dietary calcium, potassium, and magnesium consumption and glaucoma.

Zhang Y, Zhao Z, Ma Q, Li K, Zhao X, Jia Z PLoS One. 2023; 18(10):e0292883.

PMID: 37851631 PMC: 10584168. DOI: 10.1371/journal.pone.0292883.


Decoding the Complex Crossroad of Tryptophan Metabolic Pathways.

Mondanelli G, Volpi C, Orabona C Int J Mol Sci. 2022; 23(2).

PMID: 35054973 PMC: 8776215. DOI: 10.3390/ijms23020787.


The Effect of Ocular Perfusion Pressure on Retinal Thickness in Young People with Presumed Systemic Hypotension.

Vawda N, Munsamy A Vision (Basel). 2021; 5(3).

PMID: 34287377 PMC: 8293322. DOI: 10.3390/vision5030036.


References
1.
Savitz J . The kynurenine pathway: a finger in every pie. Mol Psychiatry. 2019; 25(1):131-147. PMC: 6790159. DOI: 10.1038/s41380-019-0414-4. View

2.
Cheng H, Nair G, Walker T, Kim M, Pardue M, Thule P . Structural and functional MRI reveals multiple retinal layers. Proc Natl Acad Sci U S A. 2006; 103(46):17525-30. PMC: 1859962. DOI: 10.1073/pnas.0605790103. View

3.
Wong A, Brown R . Age-related changes in visual acuity, learning and memory in C57BL/6J and DBA/2J mice. Neurobiol Aging. 2006; 28(10):1577-93. DOI: 10.1016/j.neurobiolaging.2006.07.023. View

4.
Jonas J, Aung T, Bourne R, Bron A, Ritch R, Panda-Jonas S . Glaucoma. Lancet. 2017; 390(10108):2183-2193. DOI: 10.1016/S0140-6736(17)31469-1. View

5.
Fiedorowicz M, Orzel J, Kossowski B, Welniak-Kaminska M, Choragiewicz T, Swiatkiewicz M . Anterograde Transport in Axons of the Retinal Ganglion Cells and its Relationship to the Intraocular Pressure during Aging in Mice with Hereditary Pigmentary Glaucoma. Curr Eye Res. 2017; 43(4):539-546. DOI: 10.1080/02713683.2017.1416147. View