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Curcumin and turmeric delay streptozotocin-induced diabetic cataract in rats.
Invest Ophthalmol Vis Sci. 2005 Jun; 46(6):2092-9.IO

Abstract

PURPOSE

The purpose of this study was to investigate the effect of curcumin and its source, turmeric, on streptozotocin-induced diabetic cataract in rats.

METHODS

Wistar-NIN rats were selected and diabetes was induced by streptozotocin (35 mg/kg body weight, intraperitoneally) and divided into four groups (group II-V). The control (group I) rats received only vehicle. Group I and II animals received an unsupplemented AIN-93 diet, and those in groups III, IV, and V received 0.002% and 0.01% curcumin and 0.5% turmeric, respectively, in an AIN-93 diet for a period of 8 weeks. Cataract progression due to hyperglycemia was monitored by slit lamp biomicroscope and classified into four stages. At the end of 8 weeks, the animals were killed and the biochemical pathways involved in the pathogenesis of cataract such as oxidative stress, polyol pathway, alterations in protein content and crystallin profile in the lens were investigated, to understand the possible mechanism of action of curcumin and turmeric. Blood glucose and insulin levels were also determined.

RESULTS

Although, both curcumin and turmeric did not prevent streptozotocin-induced hyperglycemia, as assessed by blood glucose and insulin levels, slit lamp microscope observations indicated that these supplements delayed the progression and maturation of cataract. The present studies suggest that curcumin and turmeric treatment appear to have countered the hyperglycemia-induced oxidative stress, because there was a reversal of changes with respect to lipid peroxidation, reduced glutathione, protein carbonyl content and activities of antioxidant enzymes in a significant manner. Also, treatment with turmeric or curcumin appears to have minimized osmotic stress, as assessed by polyol pathway enzymes. Most important, aggregation and insolubilization of lens proteins due to hyperglycemia was prevented by turmeric and curcumin. Turmeric was more effective than its corresponding levels of curcumin.

CONCLUSIONS

The results indicate that turmeric and curcumin are effective against the development of diabetic cataract in rats. Further, these results imply that ingredients in the study's dietary sources, such as turmeric, may be explored for anticataractogenic agents that prevent or delay the development of cataract.

Authors+Show Affiliations

National Institute of Nutrition (ICMR), Hyderabad, India.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15914628

Citation

Suryanarayana, Palla, et al. "Curcumin and Turmeric Delay Streptozotocin-induced Diabetic Cataract in Rats." Investigative Ophthalmology & Visual Science, vol. 46, no. 6, 2005, pp. 2092-9.
Suryanarayana P, Saraswat M, Mrudula T, et al. Curcumin and turmeric delay streptozotocin-induced diabetic cataract in rats. Invest Ophthalmol Vis Sci. 2005;46(6):2092-9.
Suryanarayana, P., Saraswat, M., Mrudula, T., Krishna, T. P., Krishnaswamy, K., & Reddy, G. B. (2005). Curcumin and turmeric delay streptozotocin-induced diabetic cataract in rats. Investigative Ophthalmology & Visual Science, 46(6), 2092-9.
Suryanarayana P, et al. Curcumin and Turmeric Delay Streptozotocin-induced Diabetic Cataract in Rats. Invest Ophthalmol Vis Sci. 2005;46(6):2092-9. PubMed PMID: 15914628.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Curcumin and turmeric delay streptozotocin-induced diabetic cataract in rats. AU - Suryanarayana,Palla, AU - Saraswat,Megha, AU - Mrudula,Tiruvalluru, AU - Krishna,T Prasanna, AU - Krishnaswamy,Kamala, AU - Reddy,G Bhanuprakash, PY - 2005/5/26/pubmed PY - 2005/7/22/medline PY - 2005/5/26/entrez SP - 2092 EP - 9 JF - Investigative ophthalmology & visual science JO - Invest Ophthalmol Vis Sci VL - 46 IS - 6 N2 - PURPOSE: The purpose of this study was to investigate the effect of curcumin and its source, turmeric, on streptozotocin-induced diabetic cataract in rats. METHODS: Wistar-NIN rats were selected and diabetes was induced by streptozotocin (35 mg/kg body weight, intraperitoneally) and divided into four groups (group II-V). The control (group I) rats received only vehicle. Group I and II animals received an unsupplemented AIN-93 diet, and those in groups III, IV, and V received 0.002% and 0.01% curcumin and 0.5% turmeric, respectively, in an AIN-93 diet for a period of 8 weeks. Cataract progression due to hyperglycemia was monitored by slit lamp biomicroscope and classified into four stages. At the end of 8 weeks, the animals were killed and the biochemical pathways involved in the pathogenesis of cataract such as oxidative stress, polyol pathway, alterations in protein content and crystallin profile in the lens were investigated, to understand the possible mechanism of action of curcumin and turmeric. Blood glucose and insulin levels were also determined. RESULTS: Although, both curcumin and turmeric did not prevent streptozotocin-induced hyperglycemia, as assessed by blood glucose and insulin levels, slit lamp microscope observations indicated that these supplements delayed the progression and maturation of cataract. The present studies suggest that curcumin and turmeric treatment appear to have countered the hyperglycemia-induced oxidative stress, because there was a reversal of changes with respect to lipid peroxidation, reduced glutathione, protein carbonyl content and activities of antioxidant enzymes in a significant manner. Also, treatment with turmeric or curcumin appears to have minimized osmotic stress, as assessed by polyol pathway enzymes. Most important, aggregation and insolubilization of lens proteins due to hyperglycemia was prevented by turmeric and curcumin. Turmeric was more effective than its corresponding levels of curcumin. CONCLUSIONS: The results indicate that turmeric and curcumin are effective against the development of diabetic cataract in rats. Further, these results imply that ingredients in the study's dietary sources, such as turmeric, may be explored for anticataractogenic agents that prevent or delay the development of cataract. SN - 0146-0404 UR - https://www.unboundmedicine.com/medline/citation/15914628/Curcumin_and_turmeric_delay_streptozotocin_induced_diabetic_cataract_in_rats_ DB - PRIME DP - Unbound Medicine ER -