ABSTRACT
Background: The balance between pro-atherogenic and anti-atherogenic factors is very crucial in the development of atherosclerotic lesions. Although the expression of the six-transmembrane epithelial antigen of the prostate 4 (STEAP4) in myeloid cells is known to be atheroprotective, there is not a single study reporting on the status of STEAP4 expression in circulating monocytes in the early stages of diet-induced obesity or in events of glycemic excursions. Methods: We induced glycemic spikes twice daily for a 1-week duration to rats fed on regular chow and western diet, and analyzed gene expression changes in the peripheral blood mononuclear cells (PBMCs). We also conducted experiments on RAW 264.7 cells to gain insight into some of our in vivo findings. Results: Diet-induced obesity and glycemic excursions independently caused a significant increase in STEAP4 mRNA expression in PBMCs. This was also accompanied by an induction of a substantial number of pro-inflammatory cytokines, chemokines, and chemokine receptors. However, the combined effect of western diet and hyperglycemic spikes was subtle and non-additive. In the in vitro setting, either glucose spikes, persistent hyperglycemia, or a combination of palmitic acid and insulin resulted in a parallel increase in expression of STEAP4 and pro-inflammatory genes. This was, however, significantly abrogated with 4-octyl itaconate or attenuated by inhibitors of p38MAPK and NF-kB. Conclusions: STEAP4 expression in mononuclear cells is induced by increasing inflammation or oxidative stress. The observed increase in STEAP4 expression in circulating monocytes due to visceral obesity or glycemic excursions is a compensatory response. Supplementary Information: The online version contains supplementary material available at 10.1007/s13340-021-00542-1.
ABSTRACT
Objective: We investigated the effects of 5 days of spa therapy on the glycation reaction and oxidative balance defense system. Subjects: The subjects were divided into a glucose spikes group (S group: 5 cases) and non-glucose spike group (non-S group: 6 cases), and a comparative study was conducted. Method: The subjects stayed at the Inubosaki Onsen “Superb View Inubosaki Hotel” for 5 days and took spa baths twice a day for 20 min (balneotherapy). Before and after the baths, the degree of glycation was measured. Erythrocyte deformation by dark field microscope was classified into stages between 0 and 5, and the state of deformation and the levels of advanced glycation end products (AGEs) were measured. In addition, the oxidative stress (reactive oxygen metabolites, d-ROM), antioxidant power (biological antioxidant potential, BAP), and latent antioxidant capacity (BAP/d-ROM ratio) were also measured. Result: The red blood cell images before balneotherapy were worse in the S group, but there was no significant difference in the AGE values. There was also no significant difference between the two groups in terms of the oxidative balance defense system. A comparison before and after balneotherapy showed that the red blood cell images significantly improved from 3 (3-3) (median (IQR)) to 2 (1-2)°in the S group. Oxidative stress also significantly improved in group S from 342 (334-362) to 314 (303-345) CARR U. In the non-S group, the AGE value improved significantly from 0.52 (0.48-0.59) to 0.5 (0.43-053) a.u. There were no significant differences in the other items. Discussion: Changes in red blood cell images are considered to reflect changes in the early reactions of glycation, and AGEs may be evaluated as representing whole early and late reactions of glycation. In the S group, the early reaction improved, and in the non-S group, the entire glycative reaction was effective. Although the each mechanism of blood glucose to different, balneotherapy was shown to be effective in improving glycation.
ABSTRACT
Objective: We investigated the effects of 5 days of spa therapy on the glycation reaction and oxidative balance defense system. Subjects: The subjects were divided into a glucose spikes group (S group: 5 cases) and non-glucose spike group (non-S group: 6 cases), and a comparative study was conducted. Method: The subjects stayed at the Inubosaki Onsen “Superb View Inubosaki Hotel” for 5 days and took spa baths twice a day for 20 min (balneotherapy). Before and after the baths, the degree of glycation was measured. Erythrocyte deformation by dark field microscope was classified into stages between 0 and 5, and the state of deformation and the levels of advanced glycation end products (AGEs) were measured. In addition, the oxidative stress (reactive oxygen metabolites, d-ROM), antioxidant power (biological antioxidant potential, BAP), and latent antioxidant capacity (BAP/d-ROM ratio) were also measured. Result: The red blood cell images before balneotherapy were worse in the S group, but there was no significant difference in the AGE values. There was also no significant difference between the two groups in terms of the oxidative balance defense system. A comparison before and after balneotherapy showed that the red blood cell images significantly improved from 3 (3-3) (median (IQR)) to 2 (1-2)° in the S group. Oxidative stress also significantly improved in group S from 342 (334-362) to 314 (303-345) CARR U. In the non-S group, the AGE value improved significantly from 0.52 (0.48-0.59) to 0.5 (0.43-053) a.u. There were no significant differences in the other items. Discussion: Changes in red blood cell images are considered to reflect changes in the early reactions of glycation, and AGEs may be evaluated as representing whole early and late reactions of glycation. In the S group, the early reaction improved, and in the non-S group, the entire glycative reaction was effective. Although the each mechanism of blood glucose to different, balneotherapy was shown to be effective in improving glycation.