Diabetes can alter the signal transduction pathways in the lens of rats

D. Steven Zatechka, Peter F. Kador, Sixto Garcia-Castiñeiras, Marjorie F. Lou

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Diabetes is known to affect cataract formation by means of osmotic stress induced by activated aldose reductase in the sorbitol pathway. In addition, alterations in the bioavailability of numerous extralenticular growth factors has been reported and shown to result in various consequences. We have found that the basic fibroblast growth factor (bFGF) accumulates in the vitreous humor of 3- and 8-week diabetic rats. Consequently, the associating signal transduction cascades were severely disrupted, including upregulated phosphorylation of extracellular signal-regulated kinase (ERK) and the common stress-associated mitogen-activated protein kinases p38 and SAPK/JNK. Conversely, under diabetic condition, we observed a dramatic inhibition of phosphatidylinositol-3 kinase activity in lenses obtained from the same animal. Rats treated with the aldose reductase inhibitor AL01576 for the duration of the diabetic condition showed that the diabetes-induced lenticular signaling alterations were normalized, comparable to controls. However, treatment of AL01576 in vitro was ineffective at normalizing the altered constituents in extracted diabetic vitreous after the onset of diabetes. The effect of AL01576 in the high galactose-induced cataract model in vitro was also examined. Administration of AL01576 to lens organ culture normalized the aberrant signaling effects and morphological characteristics associated with in vitro sugar cataract formation. In conclusion, our findings demonstrate diabetes-associated alterations in the lens signal transduction parameters and the effectiveness of AL01576 at normalizing such alterations. The causes for these alterations can be attributed to elevated vitreal bFGF in conjunction with osmotic stress and associated attenuation in redox status of the lens.

Original languageEnglish (US)
Pages (from-to)1014-1022
Number of pages9
JournalDiabetes
Volume52
Issue number4
DOIs
StatePublished - Apr 1 2003

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Lenses
Signal Transduction
Cataract
Aldehyde Reductase
Osmotic Pressure
p38 Mitogen-Activated Protein Kinases
Fibroblast Growth Factor 2
Phosphatidylinositol 3-Kinase
Vitreous Body
Sorbitol
Organ Culture Techniques
Extracellular Signal-Regulated MAP Kinases
Galactose
Biological Availability
Oxidation-Reduction
Intercellular Signaling Peptides and Proteins
Phosphorylation
In Vitro Techniques

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

Diabetes can alter the signal transduction pathways in the lens of rats. / Zatechka, D. Steven; Kador, Peter F.; Garcia-Castiñeiras, Sixto; Lou, Marjorie F.

In: Diabetes, Vol. 52, No. 4, 01.04.2003, p. 1014-1022.

Research output: Contribution to journalArticle

Zatechka, DS, Kador, PF, Garcia-Castiñeiras, S & Lou, MF 2003, 'Diabetes can alter the signal transduction pathways in the lens of rats', Diabetes, vol. 52, no. 4, pp. 1014-1022. https://doi.org/10.2337/diabetes.52.4.1014
Zatechka, D. Steven ; Kador, Peter F. ; Garcia-Castiñeiras, Sixto ; Lou, Marjorie F. / Diabetes can alter the signal transduction pathways in the lens of rats. In: Diabetes. 2003 ; Vol. 52, No. 4. pp. 1014-1022.
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