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Approximately 120?million people are estimated to have diabetes worldwide, including http://www.selleckchem.com/products/MG132.html 17?million Americans (Chew 2003). Ocular complications of diabetes include diabetic retinopathy (DR) and diabetic macular oedema (DMO). The latter, which involves retinal oedema in the macular area, is a frequent manifestation of DR and can occur during any stage of the disease (Ciulla et?al. 2003), although it occurs more frequently as the duration of diabetes and severity of DR increase (Lopes de Faria et?al. 1999). Diabetic retinopathy is the leading cause of blindness among working-age adults (Moss et?al. 1998; Williams et?al. 2004) and DMO is the most common cause of impaired visual acuity (VA) in diabetes subjects (Moss et?al. 1998; Williams et?al. 2004). Approximately half the patients with DMO will lose ��?2?lines of VA within 2?years (Ferris & Patz 1984). Therefore, understanding the pathogeneses http://www.selleck.cn/products/Bleomycin-sulfate.html of DMO and DR is important in order to prevent these diabetes complications and to develop new treatments to protect the sight of diabetes patients. Diabetes mellitus-associated macular oedema is characterized by a thickening of the macular region caused by a breakdown in the blood�Cretinal barrier (BRB) through dilated capillaries, microaneurysms and loss of pericytes (Ciulla et?al. 2003). The Early Treatment Diabetic Retinopathy Study (ETDRS) (1985) defined macular oedema as thickening of the retina and/or hard exudates with retinal thickening within one disc diameter of the centre of the macula. In 2003, the Global Diabetic Retinopathy Project classified disease severity on an international DMO severity scale. The definition included mild, moderate and severe macular oedema according to the amount of involvement of the central macula (Wilkinson et al. 2003). Population-based studies have helped to elucidate the development of DMO in the context of hyperglycaemia. The Wisconsin Epidemiologic Study of Diabetic Retinopathy (WESDR) found that the 10-year rate of developing DMO was 20.1% among type 1 diabetes subjects, 25.4% among type 2 diabetes subjects using insulin and 13.9% among type 2 diabetes subjects not using insulin http://www.selleckchem.com/products/Rapamycin.html (Klein et?al. 1995). A New Jersey-based study found that 15.9% of African-American patients with type 1 DM developed DMO during a 6-year follow-up period (Roy & Affouf 2006). These and other studies, such as the Diabetes Control and Complications Trial (DCCT) and the UK Prospective Diabetes Study (UKPDS), highlight the importance of intensive glycaemic control in preventing DMO. Achieving a haemoglobin A1c (glycosylated haemoglobin) level of 7.5�C7.9% (DCCT 1993) or a fasting plasma glucose