Astaxanthin is a carotenoid with potent antioxidant and anti-inflammatory activity. To evaluate the anti-inflammatory effect of astaxanthin on skin deterioration, we confirmed its role in epidermal-dermal interactions in vitro. Astaxanthin treatment suppressed ultraviolet B (UVB)-induced inflammatory cytokine secretion in keratinocytes, and matrix metalloproteinase-1 secretion by fibroblasts cultured in UVB-irradiated keratinocyte medium. To verify these findings, we conducted a 16-week clinical study with 65 healthy female participants. Participants were orally administered either a 6 mg or 12 mg dose of astaxanthin or a placebo. Wrinkle parameters and skin moisture content significantly worsened in the placebo group after 16 weeks. However, significant changes did not occur in the astaxanthin groups. Interleukin-1α levels in the stratum corneum significantly increased in the placebo and low-dose groups but not in the high-dose group between weeks 0 and 16. This study was performed in Japan from August to December, when changing environmental factors, such as UV and dryness, exacerbate skin deterioration. In conclusion, our study suggests that long-term prophylactic astaxanthin supplementation may inhibit age-related skin deterioration and maintain skin conditions associated with environmentally induced damage via its anti-inflammatory effect. (UMIN Clinical Trials Registry ID: UMIN000018550)
Astaxanthin, a natural antioxidant, exists in non-esterified and esterified forms. Although it is known that astaxanthin can improve exercise endurance and cause metabolic improvement in skeletal muscle, the effects of the two different forms are unclear. We investigated the effects of the different forms of astaxanthin on endurance in mice. Eight-week-old ICR mice were divided into four groups: control; astaxanthin extracted from Haematococcus pluvialis in an esterified form; astaxanthin extracted from Phaffia rhodozyma in a non-esterified form; and astaxanthin synthesized chemically in a non-esterified form. After 5 weeks of treatment, each group was divided into sedentary and exercise groups. In the group fed astaxanthin from Haematococcus, the running time to exhaustion was longest, and the plasma and tissue concentrations of astaxanthin were significantly higher than those in the other groups. Astaxanthin from Haematococcus increased 5'-adenosine monophosphate-activated protein kinase levels in the skeletal muscle. Although the mice in the Haematococcus group ran for longer, hexanoyl lysine adduct levels in the skeletal muscle mitochondria were similar in the control and Haematococcus groups. Our results suggested that esterified astaxanthin promoted energy production and protected tissues from oxidative damage during exercise owing to its favorable absorption properties, leading to a longer running time.
We investigated the efficacy of supplementing the diet with choline or betaine in ameliorating lipid accumulation induced by vitamin B (B) deficiency in rat liver. Male Wistar rats were fed a control, B-deficient, choline-supplemented (2, 4, or 6 g choline bitartrate/kg diet) B-deficient diet or betaine-supplemented (1, 2, or 4 g betaine anhydrous/kg diet) B-deficient diet for 35 d; all diets contained 9 g L-methionine (Met)/kg diet. Choline or betaine supplementation attenuated liver lipid deposition and restored plasma lipid profiles to control levels. These treatments restored the disruptions in Met metabolism and the phosphatidylcholine (PC)/phosphatidylethanolamine (PE) ratio induced by B deficiency in liver microsomes. These results suggest that choline and betaine ameliorated liver lipid accumulation induced by B deficiency via recovery of Met metabolism and very low-density lipoprotein secretion by restoring the supply of PC derived from PE.
Apraxia of speech (AOS) is typically considered as characterized by kinematic timing problems among articulators; however, kinematic descriptions of such phenomenon are scarce. The goal of this study was to describe articulatory timing between the lips and jaw and the lips and tongue in young normal and AOS speakers across three speaking rates, using x-ray microbeam data. Data of young normal speakers were taken from the x-ray microbeam speech production database. Lip protrusion and tongue elevation timings were derived from the kinematic and acoustic data in the production of “too” in the sentence “The other one is too big” and lip and jaw closing timings for /b/ and /w/ were derived from the kinematic data of the same sentence. The temporal relationships between these articulatory movements in each event were then examined with consideration of the effect of speaking rate. The results are discussed in relation to the effect of speaking rate on interarticulator timing and interspeaker variability in interarticulator timing.
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