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Published Papers 【 display / non-display 】

• Impact of the transition from radioimmunoassay (RIA) to chemiluminescent enzyme immunoassay (CLEIA) for the measurement of plasma aldosterone concentration (PAC) on the diagnosis of primary aldosteronism (PA) via retrospective analyses in Okinawa, Japan

  Ken-ichiro Honma, Yoshiro Nakayama, Atsuko Tamaki, Moriyuki Uehara, Taiki Teruya, Takamitsu Yabiku, Yohei Ishiki, Ken Yonaha, Rei Chinen, Tsugumi Uema, Shiki Okamoto, Hiroaki Masuzaki

  Endocrine Journal ( JAPAN ENDOCRINE SOC )  71 ( 9 ) 895 - 906   2024.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  In Japan, the traditional method for measuring plasma aldosterone concentration (PAC) was radioimmunoassay (RIA), which had several challenges, including poor traceability of certified reference materials and reduced detection sensitivity at low concentrations. To overcome these issues, a chemiluminescent enzyme immunoassay (CLEIA) for PAC measurement was introduced in April 2021 and the Japan Endocrine Society published new guidelines for primary aldosteronism (PA). This study aimed to evaluate the impact of the transition from RIA to CLEIA for PAC measurement on PA diagnosis. Data from 190 patients admitted to the Second Department of Internal Medicine, University of the Ryukyus Hospital, between April 2012 and March 2021 were analyzed. Patients who were diagnosed with PA underwent adrenal venous sampling. The PAC measured by RIA (PAC(RIA)) was converted to the estimated PAC measured by CLEIA (ePAC(CLEIA)) using a conversion formula. The present study evaluated the discordance rates in diagnoses based on screening (SC), captopril challenge test (CCT), saline infusion test (SIT), and diagnosis of PA between results judged by PAC(RIA) according to the previous guidelines and those judged by ePAC(CLEIA) according to the new guidelines. The results revealed discordant diagnosis rates of 6.4% for SC and 10.1% for CCT, with no discordance for SIT. The discordant diagnosis rate for PA was 3.7%. Our study reveals the challenges in establishing appropriate diagnostic criteria for PA using PAC(CLEIA) and highlights the demand for further research on provisionally positive categories.

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• Post-traumatic pituitary stalk transection syndrome (PSTS) expeditiously manifested after a fall from a height combined with acute traumatic spinal cord injury: a rare case report with review of literature

  Yohei Ishiki, Atsuko Tamaki, Ken-ichiro Honma, Ken Yonaha, Takamitsu Yabiku, Taiki Teruya, Moriyuki Uehara, Yoshiro Nakayama, Rei Chinen, Tsugumi Uema, Sawako Nakachi, Shiki Okamoto, Hiroaki Masuzaki

  Endocrine Journal ( JAPAN ENDOCRINE SOC )  71 ( 8 ) 817 - 824   2024.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Post-traumatic pituitary stalk transection syndrome (PSTS) is an extremely rare cause of combined pituitary hormone deficiency (CPHD), affecting approximately 9 per 100,000 cases of traumatic brain injury. In contrast, pituitary stalk interruption syndrome (PSIS) is also a rare cause of CPHD. Importantly, these conditions are often confused due to their similar names and resembling findings on magnetic resonance imaging (MRI). PSIS has been thought to be a prenatal developmental event resulting from a couple of genetic aberrations. In typical PSIS, anterior pituitary hormone deficiencies are restricted to growth hormone (GH) and gonadotropin during the pediatric age, gradually and generally progressing to panhypopituitarism in most cases. In contrast, global deficiencies of the anterior pituitary hormones in PSTS are temporally associated with trauma. To the best of our knowledge, no case reports of PSTS combined with acute traumatic spinal cord injury have been reported. A 34-year-old female was transferred to our hospital after jumping from the fourth building floor. She was diagnosed as an acute traumatic spinal cord injury and underwent the operation of elective posterior spinal fusion. On postoperative day 7, the blood tests revealed considerable hyperkalemia, hyponatremia and eosinophilia. Notably, menstruation stopped after falling from a height. Pituitary function tests revealed GH deficiency, hypogonadism, hypothyroidism and hypoadrenocorticism. MRI revealed loss of the pituitary stalk, whilst the hyperintense signal from distal axon of hypothalamus was still identified. Based on these findings, she was diagnosed as PSTS. Our case highlights endocrinological landscape of transection of the pituitary stalk by acute trauma.

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• Gut microbiota-based prediction for the transition from normal glucose tolerance (NGT) to impaired glucose tolerance (IGT) in a remote island cohort study

  Tsugumi Uema, Mari Tsukita, Shiki Okamoto, Moriyuki Uehara, Ken-Ichiro Honma, Yoshiro Nakayama, Atsuko Tamaki, Minoru Miyazato, Asuka Ashikari, Shiro Maeda, Minako Imamura, Masayuki Matsushita, Koshi Nakamura, Hiroaki Masuzaki

  Diabetes Research and Clinical Practice   ( 213 ) 111747   2024.06 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Aim: The present cohort study explored whether specific gut microbiota (GM) profile would predict the development of impaired glucose tolerance (IGT) in individuals with normal glucose tolerance (NGT). Methods: A total of 114 study subjects with NGT in Kumejima island, Japan participated in the present study and underwent 75 g oral glucose tolerance tests at baseline and one year later. We compared the profile of GM at baseline between individuals who consistently maintained NGT (NRN, n = 108) and those who transitioned from NGT to IGT (NTI, n = 6). Results: Within-individual bacterial richness and evenness as well as inter-individual bacterial composition showed no significant differences between NRN and NTI. Of note, however, partial least squares discriminant analyses revealed distinct compositions of GM between groups, with no overlap in their 95 % confidence interval ellipses. Multi-factor analyses at the genus level demonstrated that the proportions of CF231, Corynebacterium, Succinivibrio, and Geobacillus were significantly elevated in NTI compared to NRN (p < 0.005, FDR < 0.1, respectively) after adjusting for age, sex, HbA1c level, and BMI. Conclusions: Our data suggest that increased proportion of specific GM is linked to the future deterioration of glucose tolerance, thereby serving as a promising predictive marker for type 2 diabetes mellitus.

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• Impact of treatment cessation on incidence and progression of retinopathy in Japanese patients with type 2 diabetes mellitus: a retrospective cohort study

  Yukiko Shinzato, Yoshiro Nakayama, Shiki Okamoto, Jasmine F. Millman, Tsugumi Uema, Ken-ichiro Honma, Atsuko Tamaki, Moriyuki Uehara, Taiki Teruya, Takamitsu Yabiku, Yohei Ishiki, Ken Yonaha, Ko-ichiro Arakaki, Moritake Higa, Hideki Koizumi, Koshi Nakamura, Michio Shimabukuro & Hiroaki Masuzaki

  Diabetology International   ( 15 ) 535 - 543   2024.05 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Profile of gut microbiota and serum metabolites associated with metabolic syndrome in a remote island most afflicted by obesity in Japan

  Tsugumi Uema, Jasmine F. Millman, Shiki Okamoto, Takehiro Nakamura, Kiyoto Yamashiro, Moriyuki Uehara, Ken-ichiro Honma, Minoru Miyazato, Asuka Ashikari, Seiichi Saito, Shiro Maeda, Minako Imamura, Hajime Ishida, Masayuki Matsushita, Koshi Nakamura & Hiroaki Masuzaki

  Scientific Reports   ( 12 ) 17292   2022.10 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Numerous studies have revealed distinct differences in the profiles of gut microbiota between non-obese and obese individuals. To date, however, little is known if any disparities in the community of gut microbiota exist between metabolically healthy obese (MHO) and metabolically unhealthy obese (MUO) subjects. We therefore aimed to comprehensively characterize the gut microbiota and circulating metabolites in serum from both MHO and MUO residing in the remote island, Kumejima, where the prevalence of obesity is one of the highest in Japan, and explored possible correlations between the gut microbiota profile and markers of metabolic syndrome. Results revealed that MUO showed significantly higher levels of genera such as g_Succinivibrio, g_Granulicatella, g_Brachyspira, g_Oribacterium and g_Atopobium in comparison to MHO. Moreover, abundance of g_Succinivibrio, g_Brachyspira and g_Atopobium were positively correlated with value of fasting insulin, HOMA-R, circulating triglycerides, diastolic blood pressure, BMI, body weight, waist circumference and HbA1c. In addition, MUO compared to MHO showed an imbalance of serum metabolites, with a significant elevation in 2-oxoisovaleric acid, pyruvic acid, 2-hydroxybutyric acid, and creatine. Our data highlight unmet needs in precision approaches for the treatment of obesity, targeting the gut microbiota profile and serum metabolites in a distinct population affected by obesity.

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