|Akihiro Tsuchimoto||Last modified date：2020.06.09|
Assistant Professor / Department of Medicine and Clinical Science / Department of Nephrology,Hypertension,and Strokology / Kyushu University Hospital
|Akihiro Tsuchimoto||Last modified date：2020.06.09|
|1.||Tsuchimoto A, Masutani K, Ueki K, Nakagawa K, Matsukuma Y, Tanaka S, Unagami K, Kakuta Y, Okumi M, Noguchi H, Kaku K, Okabe Y, Nakano T, Kitazono T, Nakamura M, Ishida H, Tanabe K; Japan Academic Consortium of Kidney Transplantation (JACK) Investigators., Effect of renin-angiotensin system blockade on graft survival and cardiovascular disease in kidney transplant recipients: retrospective multicenter study in Japan., doi: 10.1007/s10157-019-01827-1, 2020.01, BACKGROUND: Renin-angiotensin system blockers (RASBs) reduce end-stage kidney disease and cardiovascular event (CVE) development in chronic kidney disease. However, whether RASBs improve long-term prognosis in kidney transplant (KT) recipients remain unknown. METHOD: We investigated 900 kidney transplant patients in a multicenter retrospective cohort study in Japan and compared death-censored graft survival and CVE (total, cardiac events, stroke) based on RASB use within 12 months after KT. The associations were examined using a Cox hazard model and propensity score-matching analysis. RESULTS: The cohort comprised 375 patients treated with RASBs (RASB group) and 525 patients without RASBs (control group). The median observational period was 82 months, with 68 patients reaching graft loss: 79 total CVE, 36 cardiac events, 26 stroke. In a matching cohort comprising 582 patients, death-censored graft survival, total CVE, and cardiac events were not different between the two groups. Only stroke incidence rate was significantly lower in the RASB group compared with the control group (1.4 vs. 6.4 per 1000 patients/year, log-ranked P = 0.005). In a multivariable analysis, stroke events were also significantly lower in the RASB group compared with the control group (Hazard ratio and 95% confidence interval, 0.20 [0.04-0.62]). CONCLUSION:Thus, RASBs potentially reduce stroke events in KT recipients..|
|2.||Masutani K, Tsuchimoto A, Matsukuma Y, Tanaka S, Kaku K, Noguchi H, Kurihara K, Okabe Y, Nakano T, Tsuruya K, Nakashima H, Nakamura M, Kitazono T., Predictive Value of the Combination of Peripheral Blood Lymphocyte Count and Urinary Cytology in BK Polyomavirus-associated Nephropathy., Transplant Proc., 10.1016/j.transproceed.2019.01.129, 51, 5, 1410-1414, 2019.06, BACKGROUND: Graft biopsy is the gold standard for diagnosis of BK polyomavirus-associated nephropathy (BKPyVAN), and polymerase chain reaction is the most specific screening technique. Development of a noninvasive, cost-effective marker for BKPyVAN is important. METHODS:We reviewed 492 adult kidney transplant patients. We investigated peripheral blood lymphocyte (PBL) count and urinary cytology at graft biopsy in patients with BKVPyAN (n = 21), acute T-cell-mediated rejection (n = 79), and no evidence of acute rejection (n = 149). We performed univariate and multivariate logistic regression and receiver operating characteristics analyses to compare the test performance of PBL count, urinary cytology, and their combination for diagnosis of BKPyVAN. RESULTS:The PBL count at biopsy was significantly lower in the BKPyVAN group than the acute T-cell-mediated rejection and no acute rejection groups (959 ± 290/μL, 1433 ± 673/μL, and 1531 ± 549/μL, respectively; P < .01). The PBL count was 959 ± 290/μL at diagnosis of BKPyVAN and increased to 1123 ± 377/μL, 1238 ± 419/μL, and 1292 ± 491/μL at 1, 2, and 3 months after treatment, respectively (P < .05). On univariate analysis, the area under the curve was significantly higher for the combined model than for PBL and cytology alone (0.930, 0.797, and 0.875, respectively; P < .01). The improved test performance in the combined model remained significant after multivariate adjustment (0.972, 0.844, and 0.928, respectively; P < .01). CONCLUSIONS: Decreased PBL count was found in BKPyVAN, and the predictive performance of the combination of PBL count and urinary cytology was significantly enhanced for diagnosis of BKPyVAN..|
|3.||Tsuchimoto A, Masutani K, Omoto K, Okumi M, Okabe Y, Nishiki T, Ota M, Nakano T, Tsuruya K, Kitazono T, Nakamura M, Ishida H, Tanabe K, Kidney transplantation for treatment of end-stage kidney disease after haematopoietic stem cell transplantation: case series and literature review., Clin Exp Nephrol, 23, 4, 561-568, 2019.04, BACKGROUND: The safety of kidney transplantation (KT) for end-stage kidney disease (ESKD) after haematopoietic stem cell transplantation (HSCT) for haematological disease has not been investigated thoroughly. METHODS: In this retrospective multicentre study, we investigated the clinical courses of six ESKD patients that received KT after HSCT for various haematological diseases. Data for six such patients were obtained from three institutions in our consortium. RESULTS: Two patients with chronic myeloid leukaemia, one with refractory aplastic anaemia and another one with acute lymphocytic leukaemia received bone marrow transplantation. One patients with acute lymphocytic leukaemia received umbilical cord blood transplantation, and one with mantle cell lymphoma received peripheral blood stem cell transplantation. The patients developed ESKD at a median of 133 months after HSCT. Two patients who received KT and HSCT from the same donor were temporarily treated with immunosuppressive drugs. The other patients received KT and HSCT from different donors and were treated with antibody induction using our standard regimens. For one patient with ABO-incompatible transplantation, we added rituximab, splenectomy, and plasmapheresis. In the observational period at a median of 51 months after KT, only one patient experienced acute T-cell-mediated rejection. Four patients underwent hospitalization because of infection and fully recovered. No patient experienced recurrence of their original haematological disease. All patients survived throughout the observational periods, and graft functions were preserved. CONCLUSIONS: Despite the high infection frequency, survival rates and graft functions were extremely good in patients compared with previous studies. Therefore, current management contributed to favourable outcomes of these patients..|
|4.||Tsuchimoto Akihiro, Nakano Toshiaki, Hasegawa Shoko, Masutani Kosuke, Matsukuma Yuta, Eriguchi Masahiro, Nagata Masahiro, Nishiki Takehiro, Kitada Hidehisa, Tanaka Masao, Kitazono Toshiaki, Tsuruya Kazuhiko., The potential role of perivascular lymphatic vessels in preservation of kidney allograft function., Clin Exp Nephrol, 10.1007/s10157-016-1338-9, 2017.08, BACKGROUND: Lymphangiogenesis occurs in diseased native kidneys and kidney allografts, and correlates with histological injury; however, the clinical significance of lymphatic vessels in kidney allografts is unclear.
METHODS: This study retrospectively reviewed 63 kidney transplant patients who underwent protocol biopsies. Lymphatic vessels were identified by immunohistochemical staining for podoplanin, and were classified according to their location as perivascular or interstitial lymphatic vessels. The associations between perivascular lymphatic density and kidney allograft function and pathological findings were analyzed. RESULTS: There were no significant differences in perivascular lymphatic densities in kidney allograft biopsy specimens obtained at 0 h, 3 months and 12 months. The groups with higher perivascular lymphatic density showed a lower proportion of progression of interstitial fibrosis/tubular atrophy grade from 3 to 12 months (P for trend = 0.039). Perivascular lymphatic density was significantly associated with annual decline of estimated glomerular filtration rate after 12 months (r = -0.31, P = 0.017), even after adjusting for multiple confounders (standardized β = -0.30, P = 0.019). CONCLUSIONS: High perivascular lymphatic density is associated with favourable kidney allograft function. The perivascular lymphatic network may be involved in inhibition of allograft fibrosis and stabilization of graft function..
|5.||Tsuchimoto Akihiro, Kosuke Masutani, Kazuhiko Tsuruya, Takanari Kitazono, Masao Tanaka, Masaharu Nagata, Naoki Haruyama, Yasuhiro Okabe, Renal interstitial fibrosis in 0-hour biopsy as a predictor of post-transplant anemia., American journal of nephrology, 2013.09, BACKGROUND/AIMS: Anemia is common in kidney transplant patients and may cause adverse cardiovascular events. Several studies have reported some predictors of post-transplant anemia. However, associations between the pathological findings in the 0-hour biopsy and anemia have not been well described. METHODS: 258 consecutive kidney transplant patients were enrolled in this retrospective study. The patients were divided into two groups, according to the presence or absence of interstitial fibrosis and tubular atrophy (IF/TA) in the 0-hour biopsy: the IF/TA group with fibrotic area ≥5% (n = 131) and the non-IF/TA group with fibrotic area <5% (n = 127). We examined the association between IF/TA and post-transplant anemia. RESULTS: Serial changes in hemoglobin levels in the IF/TA group were lower than in the non-IF/TA group (p = 0.007). Anemia at 12 months was found in 53% of the IF/TA group, and 35% of the non-IF/TA group (p = 0.004). Even after adjustment for several confounders including graft function, the presence of IF/TA was independently associated with post-transplant anemia at 12 months (odds ratio 1.88, 95% confidence interval 1.06-3.36, p = 0.031). This association was still significant in a subgroup with normal graft function. CONCLUSIONS: IF/TA in the 0-hour biopsy specimen is one of the predictors for post-transplant anemia and can be used to identify patients who need the treatment with erythropoiesis-stimulating agents..|