Four to seven random casual urine specimens are sufficient to estimate 24-h urinary sodium/potassium ratio in individuals with high blood pressure.

This study was done to clarify the optimal number and type of casual urine specimens required to estimate urinary sodium/potassium (Na/K) ratio in individuals with high blood pressure. A total of 74 individuals with high blood pressure, 43 treated and 31 untreated, were recruited from the Japanese general population. Urinary sodium, potassium and Na/K ratio were measured in both casual urine samples and 7-day 24-h urine samples and then analyzed by correlation and Bland-Altman analyses. Mean Na/K ratio from random casual urine samples on four or more days strongly correlated with the Na/K ratio of 7-day 24-h urine (r=0.80-0.87), which was similar to the correlation between 1 and 2-day 24-h urine and 7-day 24-h urine (r=0.75-0.89). The agreement quality for Na/K ratio of seven random casual urine for estimating the Na/K ratio of 7-day 24-h urine was good (bias: -0.26, limits of agreements: -1.53-1.01), and it was similar to that of 2-day 24-h urine for estimating 7-day 24-h values (bias: 0.07, limits of agreement: -1.03 to 1.18). Stratified analyses comparing individuals using antihypertensive medication and individuals not using antihypertensive medication showed similar results. Correlations of the means of casual urine sodium or potassium concentrations with 7-day 24-h sodium or potassium excretions were relatively weaker than those for Na/K ratio. The mean Na/K ratio of 4-7 random casual urine specimens on different days provides a good substitute for 1-2-day 24-h urinary Na/K ratio for individuals with high blood pressure.

How can we increase living related donor renal transplantations?

BACKGROUND: In Japan, living donor renal transplantation has gained momentum due to an increased number of patients with end-stage renal disease. Living donation not only provides better outcomes, but also the recipients usually need less medications, thereby increasing the quality of life and reducing the potential side effects of immunosuppression. MATERIALS AND METHODS: For the past 25 years, our center had performed 140 open donor nephrectomy (OPNx) renal transplantations. Since July 2003, we changed our procurement operation to living hand-assisted laparoscopic donor nephrectomy (HALNx) in 49 cases. Our operative technique consisted of two 12-mm ports placed in the midaxillary line at the superior and inferior levels of the umbilicus. Next, a 5-cm incision was made in the midline periumbilicus and the hand port system fitted through a midline abdominal incision. RESULTS: In 49 cases, HALNx was completed successfully; no patient required conversion to laparotomy. The estimated blood loss was 33.0 +/- 43.4 g and no patient required blood transfusion. In comparison, in OPNx the blood loss was 426.5 +/- 247.6 g (P < .001). The mean operative times were 167.4 +/- 39.7 minutes for HALNx and 228.4 +/- 35.7 minutes for OPNx (P < .001). The postoperative hospital stays were 9.1 +/- 3.8 days for HALNx and 13.0 +/- 1.9 days for OPNx (P < .001). For 3 years prior to introduction of HALNx, we had performed only 10 living donor renal transplantations. Since the introduction of HALNx in 2003, the number of living donors has tripled during the following 3 years. CONCLUSIONS: Herein we have reported that HALNx was superior in terms of less operative time and blood loss, postoperative pain and recovery, and shorter hospital stay. Overall donor patient satisfaction was also better in the HALNx group. HALNx is a safe procedure that makes kidney donation more appealing to potential live donors and has increased the living donor pool at our center.

The role of plasmapheresis therapy for perioperative management in ABO-incompatible adult living donor liver transplantation.

BACKGROUND: Although living donor liver transplantation (LDLT) was established as a treatment for end-stage liver disease in Japan, the indication for LDLT across an ABO-incompatible barrier remains controversial. The purpose of this study was to elucidate the role of plasmapheresis in incompatible LDLT. METHODS: Eleven adult patients (seven men and four women) who underwent incompatible LDLT were enrolled in this study. Of these three patients had hepatocellular carcinoma, three chronic hepatitis C, one Wilson's disease, one autoimmune hepatitis, one chronic hepatitis B, one hemochromatosis, and one fulminant hepatic failure. The immunosuppressive regimen consisted of tacrolimus, prednisolone, mycophenolate mofetil (or cyclophosphamide), and prostaglandin E1 in all patients. Multiple plasmapheresis was performed perioperatively to reduce the recipient's antibody titers against the donor's blood type. RESULTS: Plasmapheresis was useful for the reduction of the recipient's antibody titers to x 16 or lower before and after transplantation. There was no difference in transplant outcome between the 11 patients with incompatible blood group and 30 patients with identical or compatible blood groups. DISCUSSION: Major postoperative complications such as intrahepatic biliary complications and hepatic necrosis may occur in incompatible transplantation. Several investigators suggested that anti-immunoglobulin (Ig) M and anti-IgG antibody titers sustained these complications. The antibody titers must be decreased sufficiently with plasmapheresis. An elevation of anti-ABO titers after transplantation may be a predictive risk factor for increased mortality and morbidity. In order to perform LDLT in a safer manner, plasmapheresis is an indispensable treatment to improve the outcome of ABO-incompatible cases.

In vitro production of myeloperoxidase anti-neutrophil cytoplasmic antibody and establishment of Th1-type T cell lines from peripheral blood lymphocytes of patients.

OBJECTIVE: To investigate the pathogenic role of T cells in the development of anti-neutrophil cytoplasmic antibody (ANCA) associated vasculitis. METHODS: Peripheral blood lymphocytes (PBL) were isolated from myeloperoxidase anti-neutrophil cytoplasmic antibody (MPO-ANCA) associated vasculitis patients and cultured in medium. The production of MPO-ANCA in the medium of PBL stimulated with Concanavalin-A (Con-A), with or without cyclosporin (CyA), was measured by enzyme-linked immunosorbent assay (ELISA) on MPO coated plates. RNA isolated from PBMC of one patient was used for polymerase chain reaction (PCR) and single stranded conformational polymorphism (SSCP) studies, and MPO-specific T cell lines (TCL) were established by antigen stimulation techniques. RESULTS: PBL of patients with MPO-ANCA-associated vasculitis produced MPO-ANCA following Con-A stimulation, and this effect was inhibited by treatment with cyclosporin A (CyA) or elimination of CD4 cells. PCR-SSCP showed autoantigen-reactive oligoclonal T-cell accumulation in PBMC of one of these patients. We established MPO-specific TCL which secreted interferon-gamma (IFN-gamma), but not interleukin-4 (IL-4); all TCL were CD4 positive, CD8 negative, and HLA-DR restricted. CONCLUSIONS: Our results suggest that Th1-type T cells may mediate MPO-ANCA production, and may play a role in the onset of MPO-ANCA vasculitis.

Evaluation of appropriate blood level in continuous intravenous infusion from trough concentrations after oral administration based on area under trough level in tacrolimus and cyclosporine therapy.

The target blood concentrations of tacrolimus (TAC) and cyclosporine (CYA) during continuous intravenous infusion (C(ss)) have been determined based on clinical experience. However, it is desirable that C(ss) should be set so that the AUC after intravenous infusion is equal to the AUC after oral administration (AUC(po)). Accordingly, we performed 12-hour monitoring of blood concentrations to calculate C(ss) from the blood trough levels (C(TL)) on 15 kidney recipients administered TAC and 12 recipients administered CYA (Neoral). We used an area under the trough level (AUTL) as a new pharmacokinetic parameter. The C(ss) was evaluated from C(TL), AUC(po), and AUTL was calculated to be C(ss) = C(TL) x (AUC(po)/AUTL). In addition, AUTL/AUC(po) ratio and blood peak/trough level ratio (C(max)/C(min)) were examined to compare pharmacokinetics of TAC and CYA. The formula for TAC was C(ss) = C(TL) x 1.40 and that for CYA, C(ss) = C(TL) x 2.55. The calculated target C(ss) of TAC was 1.40 times that of C(TL), which was similar to the present clinical C(TL). In contrast, the calculated target C(ss) of CYA was 2.55 times the C(TL), and therefore an extremely high C(ss) was necessary to obtain a sufficient AUC that will be available after oral administration. Consequently, intravenous administration of CYA twice a day was considered to be more appropriate to obtain sufficient CYA pharmacokinetics, rather than a continuous intravenous administration. We conclude that the formula, C(ss) = C(TL) x (AUC(po)/AUTL) was useful to calculate the target blood concentration of calcineurin inhibitors when changing from continuous intravenous infusion to oral administration of these drugs.

Pharmacokinetic differences between morning and evening administration of cyclosporine and tacrolimus therapy.

We performed 24-hour monitoring of cyclosporine (NEO) and tacrolimus (TAC) blood concentrations, evaluating pharmacokinetic parameters and characterizing circadian variations. The monitoring was performed in 10 instances on nine patients administered NEO and 12 out of 11 patients administered TAC. All cases were administered equally divided doses of drugs twice daily orally. Blood samples were taken before and 1, 2, 3, 4, 6, and 12 hours after NEO or TAC administration in the morning and evening. The pharmacokinetic parameters were compared between morning and evening administrations of both drugs. AUC0-12, AUC0-4, C(max), C2, and C(max)/C(min) of NEO and TAC were significantly lower during the evening compared with morning administrations. C(min) values were significantly higher in the evening. T(max) of NEO was longer in evening, although there was not a significant difference; T(max) of TAC was significantly longer in the evening. We found that NEO and TAC administrations in the evening resulted in reduced bioavailability and delayed absorption when compared with drug administrations in the morning. It was thought that the difference in bioavailability between morning and evening administrations was smaller with TAC, because TAC shows lower peak levels and a flatter blood concentration curve than NEO. C(min) was higher after evening administration than morning because of delayed absorption, though the bioavailability of both drugs decreased in the evening. These results suggest that we have to appreciate apparently high trough levels.

Optimal dose and target trough level in cyclosporine and tacrolimus conversion in renal transplantation as evaluated by lymphocyte drug sensitivity and pharmacokinetic parameters.

We evaluated the relative clinical potency of cyclosporine (CyA) and tacrolimus (Tac) using pharmacodynamic and pharmacokinetic parameters of the drug to obtain the most suitable converting dose and target trough level. The relative pharmacodynamic potency was examined by the mean ratio of drug concentrations giving 50% inhibition of blastogenesis of lymphocytes (IC50) in 66 chronic renal failure patients. The relative potency estimated from clinical pharmacokinetic parameters was examined by the mean ratio of each pharmacokinetic parameter value of CyA versus Tac. The pharmacokinetic parameters were estimated by 12-hour monitoring of drug blood concentrations in seven CyA patients and seven Tac patients. The mean IC50 ratio of CyA and Tac (CyA/Tac of IC50) was 25.1. The mean area under the concentration-time curve (AUC) ratio (CyA/Tac of AUC) was 25.5, the mean trough level (C(min)) ratio (CyA/Tac of C(min)) was 13.2, and the mean dose per body weight ratio was 25.2. The relative potency estimated from AUC that is the most reliable pharmacokinetic parameter for the estimation of clinical efficacy of calcineurin inhibitors appeared to agree with the relative pharmacodynamic potency estimated from IC50. The data suggest that TAC 25-fold more potent than CyA, which represents a suitable converting dose ratio, and that target trough level of CyA is about 13-fold greater than Tac based on CyA/Tac of C(min). We conclude that these relative values may be useful to estimate the suitable dose and target trough levels to convert between CyA and Tac.

Radial flow bioreactor for the creation of bioartificial liver and kidney.

A radial flow bioreactor (RFB) is used for a three-dimensional perfusion culture of hepatocellular carcinoma (HCC) cells and renal cells, to create a bioartificial liver and kidney. The cylindrical reactor is filled with porous cellulose microcarrier. RFB can be characterized as a system in which the medium flows from the periphery toward the center of the reactor, thereby delivering an adequate supply of oxygen and nutrients to cells at the center as well as at the periphery. HCC cells incubated in the RFB system at high density maintained viability for long periods of time. Proximal tubular cells (LLC-PK1) as well as HCC cells, but not human immortalized mesangial cells (HMC) were cultured in the RFB for more than 14 days. The mRNA expression of some enzymes involved in the urea cycle, cytochrome P450s in HCC cells, and the 1-alpha-hydroxylase (CYP27B1) in LLC-PK1 cells was higher than that in monolayer cultures. These results suggest that the RFB system composed of HCC cells or renal cells may be useful for a bioartificial liver and kidney.

Successful case of adult ABO-incompatible liver transplantation: beneficial effects of intrahepatic artery infusion therapy: a case report.

BACKGROUND: In Japan ABO-incompatible liver transplantation has been done on >100 occasions up to 2003. However, <30% are cases involving adults. The difficultly of ABO-incompatible liver transplantation is associated with the high frequency of humoral rejection and local disseminated intravascular coagulation (DIC), leading to many postoperative complications. We report a successful case of adult ABO-incompatible liver transplantation with the use of an intrahepatic artery infusion. METHODS: A 36-year-old man with Wilson disease, underwent living donor liver transplantation from an ABO-incompatible donor. The immunosuppressive therapy included multiple perioperative plasmaphereses, splenectomy, and treatment with tacrolimus, methylprednisolone, and cyclophosphamide. The dose and blood level of tacrolimus were the same as in ABO-compatible cases. In addition to these therapies, we administered an intrahepatic arterial infusion with prostaglandin (PG) E1 alone. RESULTS: After perioperative plasmapheresis and cyclophosphamide, antidonor blood group antibody titers remained undiluted and without vascular complications throughout the postoperative course, but there was a tendency for bleeding that continued for 10 days after transplantation. On postoperative day 10, a reexploration was performed for intraabdominal bleeding. During another operation on postoperative day 59 a biloma was found and drained. The patient has now survived for 120 days after transplantation with normal liver function. CONCLUSIONS: Beneficial effect of intrahepatic artery infusion with PGE1 seems to be useful in adult ABO-incompatible liver transplantation.

Systemic granulomatous arteritis associated with Epstein-Barr virus infection.

A 61-year-old woman initially presented with symptoms and findings reminiscent of infectious mononucleosis, and her illness then took a rapidly fatal course. Autopsy revealed widespread granulomatous arteritis, with multinucleated giant cells but without eosinophils and fibrinoid necrosis, affecting small arteries and arterioles and infiltration of haemophagocytic histiocytes into many organs. In situ hybridization with Epstein-Barr virus (EBV)-specific oligonucleotide probes showed positive signals in the infiltrating immune cells and epithelial and endothelial cells of the affected organs. EBV-associated haemophagocytic syndrome (EBV-AHS) with systemic granulomatous arteritis was diagnosed. From the immunophenotypes of the infiltrating immune cells, a possible role of CD4+ T-cells in the pathogenesis of this haemophagocytic syndrome and granulomatous vasculitis was suggested.

[Excellent antiproteinuric effect by LDL apheresis in a case with severe renal dysfunction due to focal segmental glomerulosclerosis].

We report here a 19-year-old man with intractable nephrotic syndrome due to focal glomerulosclerosis (FGS) treated by low-density lipoprotein apheresis (LDL-A). The patient had been receiving several drugs, including steroids, cyclophosphamide, mizoribine and deoxysparguarine, for the past ten years, but the nephrotic syndrome was resistant to these drugs. Although the initial renal biopsy specimen showed minimal change-type lesions, the second biopsy specimen obtained 6 years later revealed typical FGS findings accompanied by lipid deposition (apoB) and macrophage infiltration (CD68) in the involved area. LDL-apheresis was performed ten times per course using a dextran sulfate cellulose column (Liposorba LA-15) as the LDL absorber and polysulfone hollow-fibers (Sulflux) as the plasma separator, processing a total of 3,000 ml of plasma during each apheresis. After treatment the serum levels of LDL and total cholesterol decreased to 50% and 58% of their initial levels, respectively. Immediately after the first course of treatment, the renal dysfunction did not improve, but a decrease in urinary protein was observed (from 43.7 g/day to 8 g/day). Two months later, because urinary protein increased and renal function decreased (Ccr 7 ml/min), a second course of treatment was started. However, his renal dysfunction did not improve and urinary protein did not decrease. In conclusion, in FGS with-progressive renal failure, renal histological findings of positive APO-B, CD68 (macrophage) in sclerotic lesion may be indications of effective LDL-apheresis.

CD28 co-stimulatory signals induce IL-2 receptor expression on antigen-stimulated virgin T cells by an IL-2-independent mechanism.

Intravenous sensitization of C57BL/6 (B6) mice with class II H-2-disparate B6-C-H-2bm12(bm12) resting B cells induced anti-bm12 CD4+ T cell tolerance as shown by hyporesponsiveness in the anti-bm12 mixed lymphocyte reaction (MLR). The present study investigated the mechanism(s) of the failure of bm12 B cells to stimulate the proliferation of B6 anti-bm12 CD4+ T cells. While stimulation in vitro to B6 splenic T cells with bm12 antigen-presenting cells (APC) induced IL-2 mRNA expression and IL-2 production, T cells stimulated with bm12 B cells expressed much less IL-2 mRNA and secreted very low but detectable levels of IL-2. Moreover, the T cells stimulated with the bm12 B cells did not proliferate and this was not corrected by the addition of rIL-2 responsiveness. Further, whereas IL-2 receptor (IL-2R) alpha chain expression was significantly induced on B6 T cells stimulated with bm12 APC; stimulation with bm12 B cells did not induce IL-2R expression over background levels. However, virgin T cells stimulated with both bm12 B cells and anti-CD28 mAb proliferated and displayed a dramatic increase in IL-2 production as well as IL-2R expression to levels commensurate with those resulting from bm12 B cells plus anti-CD28 mAb even in the presence of sufficient amounts of anti-IL-2 mAb for neutralizing produced IL-2; while levels of IL-2R were significantly lower compared to those induced in the absence of anti-IL-2 mAb, increased frequencies of IL-2R+ cells were comparable. Conversely, IL-2R was not induced by bm12 B cell stimulation in the presence of IL-2. Moreover, IL-2R expression and proliferation induced by stimulation with bm12 APC was inhibited by CTLA-4-Ig, a soluble recombinant fusion protein capable of blocking the CD28 co-stimulatory signals not only stimulate IL-2 production but also induce IL-2R expression by an IL-2-independent mechanism.