研究者業績

黒尾 誠

クロオ マコト  (Makoto Kuro-o)

基本情報

所属
自治医科大学 分子病態治療研究センター 抗加齢医学研究部 教授

J-GLOBAL ID
201401055532820666
researchmap会員ID
B000237420

論文

 288
  • Shoya Mori, Keisei Kosaki, Masahiro Matsui, Koichiro Tanahashi, Takeshi Sugaya, Yoshitaka Iwazu, Makoto Kuro-o, Chie Saito, Kunihiro Yamagata, Seiji Maeda
    Journal of Renal Nutrition 2024年7月  
  • Natsumi Nishitani, Keisei Kosaki, Shoya Mori, Masahiro Matsui, Takeshi Sugaya, Makoto Kuro-o, Chie Saito, Kunihiro Yamagata, Seiji Maeda
    Geriatrics 8(6) 118-118 2023年12月3日  
    Age-related loss of lower extremity muscle strength is pronounced in individuals with chronic kidney disease (CKD). In contrast, an increase in intrarenal flow pulsatility results in initial age-related changes in renal hemodynamics, leading to the development of CKD. To date, it remains unclear whether lower extremity muscle strength determines elevated renal flow pulsatility. This study aimed to determine the association of lower extremity muscle strength and function with intrarenal hemodynamics in individuals with and without CKD. One hundred seventy-six individuals without CKD (aged 63 ± 9 years) and 101 individuals with CKD (aged 66 ± 8 years) were included in this study. Using Doppler ultrasound, the renal resistive index (RI) was measured as a parameter of renal hemodynamics. Knee extensor muscle strength (KES), gait speed (GS), and the 30 s chair stand test (30s-CST) were used to measure lower extremity muscle strength and function. Multivariate analyses showed that GS and 30s-CST scores were independent determinants of renal RI, whereas the KES score was not associated with renal RI in individuals with and without CKD. In the two-way analysis of covariance, renal RI was the highest in individuals with CKD who had lower KES, GS, and 30s-CST scores. Reduced lower extremity muscle strength and function are independent determinants of elevated renal flow pulsatility in individuals with and without CKD.
  • Keisei Kosaki, Jiyeon Park, Masahiro Matsui, Takeshi Sugaya, Makoto Kuro-o, Chie Saito, Kunihiro Yamagata, Seiji Maeda
    Scientific Reports 13(1) 2023年7月17日  
    Abstract Inappropriate activation of intrarenal renin–angiotensin system (RAS) may contribute to the pathogenesis of cardio-renal syndrome (CRS). We aimed to examine the cross-sectional associations of urinary angiotensinogen (AGT) excretion, a biomarker of intrarenal RAS activity, with central (aortic) and renal hemodynamic parameters in middle-aged and older adults, including patients with chronic kidney disease. Aortic and renal hemodynamic parameters were measured using applanation tonometry and duplex ultrasonography in 282 participants. Urinary AGT, liver-type fatty acid-binding protein (L-FABP), and plasma N-terminal pro-B-type natriuretic peptide (NT-proBNP) levels were measured for each participant. Multiple linear regression analyses demonstrated that urinary AGT levels were associated with aortic blood pressures, pulsatile measures of renal blood flow, plasma NT-proBNP and urinary L-FABP levels after adjusting for potential covariates, including age, sex, body mass index, estimated glomerular filtration rate (GFR), and medication use. Additionally, when classified based on GFR stages and urinary AGT levels, plasma NT-proBNP and urinary L-FABP levels increased in participants with lower GFR and higher AGT groups. Our findings suggest that urinary AGT excretion is a shared determinant of central (aortic) and renal hemodynamics in middle-aged and older adults, providing clinical evidence for the potential role of intrarenal RAS activity in the development of CRS.
  • Batpurev Battulga, Kazuhiro Shiizaki, Yutaka Miura, Yasuyuki Osanai, Reiji Yamazaki, Yoshiaki Shinohara, Yoshiyuki Kubota, Toru Hara, Makoto Kuro-O, Nobuhiko Ohno
    Scientific reports 13(1) 852-852 2023年1月16日  
    Calcium phosphate forms particles under excessive urinary excretion of phosphate in the kidney. While the formation of calcium phosphate particles (CaPs) has been implicated in the damage to renal tubular cells and renal dysfunction, clarifying the ultrastructural information and the elemental composition of the small CaPs in the wide areas of kidney tissue has been technically difficult. This study introduces correlative and sequential light as well as electron microscopic CaP observation in the kidney tissue by combining fluorescent staining for CaPs and energy-dispersive X-ray spectroscopy (EDS) in scanning electron microscopy (SEM) on resin sections prepared using high-pressure freezing and freeze substitution. CaPs formed in mouse kidneys under long-term feeding of a high-phosphate diet were clearly visualized on resin sections by fluorescence-conjugated alendronate derivatives and toluidine blue metachromasia. These CaPs were verified by correlative observation with EDS. Furthermore, small CaPs formed in the kidney under short-term feeding were detected using fluorescent probes. The elemental composition of the particles, including calcium and magnesium, was identified following EDS analyses. These results suggest that the correlative microscopy approach is helpful for observing in situ distribution and elemental composition of CaPs in the kidney and contributing to studies regarding CaP formation-associated pathophysiology.
  • Yutaka Miura, Hiroshi Kurosu, Makoto Kuro-O
    Methods in molecular biology (Clifton, N.J.) 2664 333-341 2023年  
    Calciprotein particles (CPPs) are mineral-protein complexes containing solid-phase calcium-phosphate and the serum protein fetuin-A. CPPs are dispersed in the blood as colloids. Previous clinical studies revealed that circulating levels of CPPs were correlated with inflammation and vascular calcification/stiffness in patients with chronic kidney disease (CKD). Measurement of blood CPP levels is challenging because CPPs are unstable and change their physical and chemical properties spontaneously over time in vitro. Several different methods have been developed for quantification of blood CPP levels with different advantages and limitations. We have developed a simple and sensitive assay using a fluorescent probe that bound to calcium-phosphate crystals. This assay may be useful as a clinical test to evaluate the cardiovascular risk and prognosis in CKD patients.

MISC

 183

共同研究・競争的資金等の研究課題

 14