RESUMEN
PURPOSE: To investigate the impact of three different macular carotenoid formulations on macular pigment optical density and visual performance in subjects with early age-related macular degeneration. METHODS: Fifty-two subjects were supplemented and followed for 12 months, 17 of them were in intervention Group 1 (20 mg/day lutein and 2 mg/day zeaxanthin); 21 in Group 2 (10 mg/day meso-zeaxanthin, 10 mg/day lutein, and 2 mg/day zeaxanthin); and 14 in Group 3 (17 mg/day meso-zeaxanthin, 3 mg/day lutein, and 2 mg/day zeaxanthin). The macular pigment optical density was measured using customized heterochromatic flicker photometry, and visual function was assessed using corrected distance visual acuity and by letter contrast sensitivity. RESULTS: A statistically significant increase in the macular pigment optical density was observed at all measured eccentricities in Group 2 (P ≤ 0.005) and in Group 3 (P < 0.05, for all), but only at 1.75° in Group 1 (P = 0.018). Statistically significant (P < 0.05) improvements in letter contrast sensitivity were seen at all spatial frequencies (except 1.2 cycles per degree) in Group 3, and at low spatial frequencies in Groups 1 and 2. CONCLUSION: Augmentation of the macular pigment optical density across its spatial profile and enhancements in contrast sensitivity were best achieved after supplementation with a formulation containing high doses of meso-zeaxanthin in combination with lutein and zeaxanthin.
Asunto(s)
Sensibilidad de Contraste/efectos de los fármacos , Luteína/administración & dosificación , Degeneración Macular/tratamiento farmacológico , Pigmento Macular/metabolismo , Agudeza Visual/efectos de los fármacos , Zeaxantinas/administración & dosificación , Administración Oral , Anciano , Quimioterapia Combinada , Femenino , Humanos , Degeneración Macular/fisiopatología , Masculino , Persona de Mediana Edad , Preparaciones Farmacéuticas , Fotometría , Método Simple CiegoRESUMEN
Macular pigment (MP) is composed of lutein (L), zeaxanthin (Z) and meso-zeaxanthin (MZ). The present study reports on serum response to three different MP supplements in normal subjects (n 27) and in subjects with age-related macular degeneration (AMD) (n 27). Subjects were randomly assigned to: Group 1 (20 mg L and 2 mg Z), Group 2 (10 mg L, 2 mg Z and 10 mg MZ) or Group 3 (3 mg L, 2 mg Z and 17 mg MZ). Serum carotenoids were quantified at baseline, and at 4 and 8 weeks using HPLC. Response data for normal and AMD subjects were comparable and therefore combined for analysis. We report response as the average of the 4- and 8-week concentrations (saturation plateau). Serum L increased significantly in Group 1 (0·036 µmol/l per mg (269 %); P< 0·001) and Group 2 (0·079 µmol/l per mg (340 %); P< 0·001), with no significant change in Group 3 (0·006 µmol/l per mg (7 %); P= 0·466). Serum Z increased significantly in Group 1 (0·037 µmol/l per mg (69 %); P= 0·001) and Group 2 (0·015 µmol/l per mg (75 %); P< 0·001), with no significant change in Group 3 ( − 0·0002 µmol/l per mg ( − 6 %); P= 0·384). Serum MZ increased significantly in Group 1 (0·0094 µmol/l (absolute value); P= 0·015), Group 2 (0·005 µmol/l per mg; P< 0·001) and Group 3 (0·004 µmol/l per mg; P< 0·001). The formulation containing all three macular carotenoids (Group 2 supplement) was the most efficacious in terms of achieving the highest combined concentration of the three MP constituent carotenoids in serum, thereby potentially optimising the bioavailability of these compounds for capture by the target tissue (retina).
Asunto(s)
Suplementos Dietéticos , Luteína/farmacología , Degeneración Macular/sangre , Retina/metabolismo , Xantófilas/farmacología , Anciano , Disponibilidad Biológica , Método Doble Ciego , Femenino , Humanos , Luteína/sangre , Degeneración Macular/tratamiento farmacológico , Masculino , Persona de Mediana Edad , Valores de Referencia , Xantófilas/sangre , ZeaxantinasRESUMEN
PURPOSE: The three carotenoids lutein, zeaxanthin, and meso-zeaxanthin, are found at the macula and referred to as macular pigment (MP). This study was undertaken to investigate determinants of MP in a large randomly selected sample from the Republic of Ireland (as part of The Irish Longitudinal Study on Ageing [TILDA]). METHODS: MP optical density (MPOD) was measured using customized heterochromatic flicker photometry in 4373 participants. Sociodemographic and self reported health data was obtained using computer assisted personal interview (CAPI). RESULTS: Mean (SD) MPOD for the study group was 0.203 (0.156) with a range of 0 to 1.01. MPOD was higher for participants with secondary education (mean [SD] = 0.205 [0.148]) than for those with only primary education or no education (mean [SD] = 0.183 [0.113]; P < 0.001). MPOD was also higher for those with tertiary education (mean [SD] = 0.232 [0.231]) compared with primary/no education or secondary education (P < 0.001 for both comparisons). CONCLUSIONS: We report that MP is lower amongst those participants of a population-representative study who did not have secondary or third level education when compared with participants who had such education. Given the emerging evidence that MP is important for visual performance and comfort, and given the putative protection that this pigment confers against AMD (especially important in the context of increased risk of AMD in this social group), public health measures aimed at improving diet for this at-risk population need to be considered.
Asunto(s)
Envejecimiento , Mácula Lútea/fisiología , Degeneración Macular/prevención & control , Educación del Paciente como Asunto/métodos , Pigmentos Retinianos/fisiología , Anciano , Anciano de 80 o más Años , Femenino , Estudios de Seguimiento , Humanos , Incidencia , Irlanda/epidemiología , Degeneración Macular/epidemiología , Masculino , Persona de Mediana Edad , Factores de RiesgoRESUMEN
PURPOSE: To investigate changes in macular pigment optical density (MPOD) and visual performance following supplementation with different macular carotenoid formulations. METHODS: Thirty-six subjects (19 male, 17 female; mean SD, age 51 13 years) were recruited into this single-masked placebo-controlled study, and were randomly assigned to one of the following three intervention (supplementation) groups: (1) group 1 (20 mg lutein [L] and 2 mg zeaxanthin [Z]); (2) group 2 (10 mg L, 2 mg Z, and 10 mg meso-zeaxanthin [MZ]); and group 3 (placebo). Outcomes measures included visual performance and MPOD response. Data were collected at baseline, at 3 months, and at 6 months. RESULTS: At 3 and 6 months, a statistically significant increase in MPOD was found at all eccentricities (other than the most peripheral 3° location) in group 2 (P < 0.05 for all), whereas no significant increase in MPOD was demonstrable at any eccentricity for subjects in groups 1 and 3. Statistically significant improvements in visual performance measures including visual acuity and contrast sensitivity with and without glare were observed for group 2 only. Only mesopic contrast sensitivity at one spatial frequency improved significantly by 6 months (P < 0.05) for group 1. No improvements in any parameters of visual performance were observed for subjects supplemented with placebo (P > 0.05 for all). CONCLUSIONS: These results suggest that supplementation with all three macular carotenoids potentially offered advantages over preparations lacking MZ, both in terms of MPOD response and visual performance enhancement.
Asunto(s)
Carotenoides/uso terapéutico , Suplementos Dietéticos , Mácula Lútea/patología , Degeneración Macular/tratamiento farmacológico , Epitelio Pigmentado de la Retina/patología , Agudeza Visual , Adolescente , Adulto , Anciano , Antioxidantes/uso terapéutico , Femenino , Estudios de Seguimiento , Humanos , Mácula Lútea/efectos de los fármacos , Degeneración Macular/patología , Degeneración Macular/fisiopatología , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Epitelio Pigmentado de la Retina/efectos de los fármacos , Método Simple Ciego , Resultado del Tratamiento , Adulto JovenRESUMEN
PURPOSE: This study was designed to investigate serum and macular response to, and safety of supplementation with, meso-zeaxanthin (MZ), lutein (L), and zeaxanthin (Z), the carotenoids that constitute macular pigment (MP). METHODS: Forty-four healthy subjects were recruited into this randomized, placebo-controlled, clinical trial. Subjects consumed one tablet per day containing 10.6 mg MZ, 5.9 mg L, and 1.2 mg Z (intervention, I group) or placebo (P group). The spatial profile of MP optical density (MPOD) was measured with customized heterochromatic flicker photometry (cHFP), and serum concentrations of L and Z were quantified by using high performance liquid chromatography (HPLC). Subjects were assessed at baseline and at 3 and 6 months. Clinical pathology analysis was performed at baseline and 6 months. RESULTS: Serum concentrations of L and Z increased significantly in the I group (P = 0.001 and 0.003, respectively) and remained stable in the P group (P > 0.05). There was a significant increase in central MPOD in the I group (0.25°: P = 0.001; 0.5°: P = 0.001), with no significant change in the P group (P > 0.05). Clinical pathology analysis confirmed that all variables remained within the normal reference range, with the exception of total cholesterol and low-density lipoprotein (LDL), which exhibited baseline values outside the accepted normal reference range before supplementation. CONCLUSIONS: Subjects supplemented with MZ, L, and Z exhibited significant increases in serum concentrations of these carotenoids and a subsequent increase in central MPOD. Pathology analysis suggested no adverse clinical implications of consuming these carotenoids. (http://isrctn.org number, ISRCTN60816411).
Asunto(s)
Suplementos Dietéticos , Luteína/farmacocinética , Pigmentos Retinianos/farmacocinética , Xantófilas/farmacocinética , Administración Oral , Adolescente , Adulto , Cromatografía Líquida de Alta Presión , Sensibilidad de Contraste/fisiología , Método Doble Ciego , Femenino , Humanos , Hígado/fisiología , Luteína/efectos adversos , Masculino , Persona de Mediana Edad , Fotometría , Retina/fisiología , Pigmentos Retinianos/efectos adversos , Agudeza Visual/fisiología , Pruebas del Campo Visual , Xantófilas/efectos adversos , Adulto Joven , ZeaxantinasRESUMEN
PURPOSE: To investigate the relationship between specific macular pigment (MP) spatial profiles and risk factors for age-related macular degeneration (AMD). METHODS: The MP spatial profile of 484 healthy subjects was measured with customized heterochromatic flicker photometry (cHFP) and categorized into one of two profile types: typical exponential or atypical "central dip." Data on risk factors for AMD were obtained with a general health and lifestyle questionnaire. Dietary and serum concentrations of lutein (L) and zeaxanthin (Z) were also assessed. RESULTS: The presence of the central dip MP spatial profile was significantly more common in older subjects (the mean ± SD age of subjects with a central dip MP spatial profile was 46.9 ± 12 years, whereas the mean age of subjects with a typical MP spatial profile was 41.8 ± 12 years; P = 0.004) and in current cigarette smokers (P = 0.031). Also, there was a significant age-related decline in central MP optical density (MPOD; 0.25° retinal eccentricity), but in the men only (r = -0.146, P = 0.049). CONCLUSIONS: A central dip in the MP spatial profile, seen in older subjects and in cigarette smokers, may represent an undesirable feature of macular pigmentation. Further research is needed in this area.
Asunto(s)
Envejecimiento/fisiología , Luteína/metabolismo , Mácula Lútea/metabolismo , Degeneración Macular/metabolismo , Pigmentos Retinianos/metabolismo , Fumar/metabolismo , Xantófilas/metabolismo , Adolescente , Adulto , Anciano , Consumo de Bebidas Alcohólicas , Cromatografía Líquida de Alta Presión , Color del Ojo/fisiología , Conducta Alimentaria , Femenino , Humanos , Degeneración Macular/etiología , Masculino , Persona de Mediana Edad , Fotometría/instrumentación , Factores de Riesgo , Encuestas y Cuestionarios , Adulto Joven , ZeaxantinasRESUMEN
PURPOSE: The 3 carotenoids lutein, zeaxanthin, and meso-zeaxanthin, which account for the 'yellow spot' at the macula and which are referred to as macular pigment (MP), are believed to play a role in visual function and protect against age-related macular degeneration (AMD) via their optical and antioxidant properties. This study was undertaken to compare MP optical density (MPOD) in a population aged > or =50 years with MPOD values from a normative database of subjects aged 18-60 years. METHODS: Seventy-nine subjects were recruited into this pilot study (The Irish Longitudinal Study on Ageing-TILDA). MPOD was measured using heterochromatic flicker photometry. Retinal fundus photographs, lifestyle data and general health data, were also obtained. RESULTS: The mean +/- SD age of the 79 subjects recruited into this study was 65 +/- 11 years. There was a moderate, but statistically significant, age-related decline in MPOD at 0.5 degrees in the TILDA data (r = -0.251, p = 0.045), which remained upon merging with a normative database of an additional 462 subjects aged between 18 and 67 years (r = -0.179, p = 0.000). CONCLUSIONS: We report an inverse association between MPOD and increasing age. Longitudinal data in a larger cohort of participants are required to satisfactorily investigate the relationship between the optical density of this pigment and age, and with risk for development and/or progression of AMD. This pilot study represents a first step in this endeavour.
Asunto(s)
Envejecimiento/metabolismo , Luteína/metabolismo , Mácula Lútea/metabolismo , Degeneración Macular/metabolismo , Pigmentos Retinianos/metabolismo , Xantófilas/metabolismo , Adolescente , Adulto , Distribución por Edad , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Irlanda/epidemiología , Estudios Longitudinales , Degeneración Macular/epidemiología , Masculino , Persona de Mediana Edad , Fotometría , Proyectos Piloto , Distribución por Sexo , Adulto Joven , ZeaxantinasRESUMEN
PURPOSE: At the macula, the carotenoids meso-zeaxanthin (MZ), lutein (L), and zeaxanthin (Z) are collectively referred to as macular pigment (MP). This study was designed to measure serum and macular responses to a macular carotenoid formulation. MATERIALS AND METHODS: Ten subjects were recruited into this study (five normal and five with early age-related macular degeneration [AMD]). Subjects were instructed to consume a formulation containing 7.3 mg of MZ, 3.7 mg of L, and 0.8 mg of Z everyday over an eight-week period. The spatial profile of MP optical density (i.e., MPOD at 0.25 degrees , 0.5 degrees , 1 degrees , and 1.75 degrees ) was measured using customized heterochromatic flicker photometry, and a blood sample was collected at each study visit in order to analyze serum concentrations of MZ, L, and Z. RESULTS: There was a significant increase in serum concentrations of MZ and L after two weeks of supplementation (p < 0.05). Baseline serum carotenoid analysis detected a small peak eluting at the same time as MZ in all subjects, with a mean +/- SD of 0.02 +/- 0.01 micromol/L. We report significant increases in MPOD at 0.25 degrees , 0.5 degrees , 1 degree , and average MPOD across its spatial profile after just two weeks of supplementation (p < 0.05, for all). Four subjects (one normal and three AMD) who had an atypical MPOD spatial profile (i.e., central dip) at baseline had the more typical MPOD spatial profile (i.e., highest MPOD at the center) after eight weeks of supplementation. CONCLUSION: We report significant increases in serum concentrations of MZ and L following supplementation with MZ, L, and Z and a significant increase in MPOD, including its spatial profile, after two weeks of supplementation. Also, this study has detected the possible presence of MZ in human serum pre-supplementation and the ability of the study carotenoid formulation to rebuild central MPOD in subjects who have atypical profiles at baseline.
Asunto(s)
Suplementos Dietéticos , Luteína/administración & dosificación , Mácula Lútea/metabolismo , Degeneración Macular/sangre , Pigmentos Retinianos/sangre , Xantófilas/administración & dosificación , Adolescente , Adulto , Cromatografía Líquida de Alta Presión , Combinación de Medicamentos , Femenino , Humanos , Luteína/sangre , Degeneración Macular/prevención & control , Masculino , Persona de Mediana Edad , Fotometría , Proyectos Piloto , Agudeza Visual , Xantófilas/sangre , ZeaxantinasRESUMEN
PURPOSE: (Photo)-oxidative stress is believed to play a role in the pathogenesis of age-related macular degeneration (AMD), with the threshold for retinal damage being lowest for short-wavelength (blue) light. Macular pigment (MP), consisting of the carotenoids lutein (L), zeaxanthin (Z) and meso-Z, has a maximum absorption at 460 nm and protects the retina from (photo)-oxidative injury. This study was designed to investigate whether the blue light-filtering properties of the Alcon AcrySof Natural intraocular lens (ANIOL) implanted during cataract surgery affects MP optical density (MPOD). METHODS: Forty-two patients scheduled for cataract surgery were recruited for the study. These patients all had a preoperative best corrected visual acuity rating (BCVAR) of at least 0.5 (logMAR) in the study eye. The patients were randomized to have either the standard Alcon AcrySof three-piece acrylic intraocular lens (AIOL) (controls) or the ANIOL implanted at the time of cataract surgery. The spatial profile of MPOD (i.e., at 0.25 degrees, 0.5 degrees, 1.0 degrees, and 1.75 degrees eccentricity) was measured with customized heterochromatic flicker photometry (cHFP) 1 week before and 1 week after surgery, and at 3, 6, and 12 months after surgery. Serum concentrations of L and Z were also measured at each study visit. RESULTS: There was a highly significant and positive correlation between all MPODs (e.g., at 0.25 degrees) recorded 1 week before and after surgery in eyes with an AIOL implant (r = 0.915, P < 0.01; paired samples t-test, P = 0.631) and in those ANIOL implants (r = 0.868, P < 0.01; paired samples t-test, P = 0.719). Average MPOD across the retina increased significantly with time (after 3 months) in the ANIOL group (repeated-measures, general linear model, P < 0.05), but remained stable in the AIOL group (repeated-measures, general linear model, P > 0.05). There were no significant time or lens effects observed for serum L over the study period (P > 0.05). There was a significant time effect for serum Z over the study period (P < 0.05), but not a significant time/lens interaction (P > 0.05). CONCLUSIONS: Customized HFP can reliably measure the MPOD spatial profile in the presence of lens opacity, and cataract surgery does not artifactually alter MPOD readings. This study also provides evidence that implanting an IOL that filters blue light is associated with augmentation of MPOD in the absence of raised serum concentrations of L and Z. However, further and longitudinal study is needed to assess whether the observed increase in MPOD after implantation of blue-filtering IOLs is associated with reduced risk of AMD development and/or progression.