Short-term administration of recombinant human erythropoietin decreases B cell number in human peripheral blood.

OBJECTIVES: There are conflicting results on the influence of recombinant human erythropoietin (rHuEPO) administration to lymphocytes, especially to B cells. METHODS: We analyzed peripheral white blood cell (WBC) subsets in patients who received one bolus administration of rHuEPO. 119 autologous blood donors were enrolled in this study. Fourty-nine out of them were treated with rHuEPO. Blood samples were obtained before the first phlebotomy and one week later before the second one. By flow cytometry, we measured the numbers of WBC, lymphocytes, dendritic cells, CD4+ T cells, CD8+ T cells, natural killer (NK) cells, B cells, monocytes, and neutrophils, further details of B cell subsets. RESULTS: In the EPO-treatment group, absolute numbers of lymphocytes, especially CD8+ T cells, NK cells, and B cells, significantly decreased after rHuEPO administration. In B cell subsets, absolute numbers of naïve B cells and IgD-CD27- B cells significantly decreased. Other B cell subsets, such as transitional B cells, memory B cells, and marginal zone B cells, also showed a decreasing trend. CONCLUSION: These findings suggest that a single administration of rHuEPO can influence human immune system via reduction of B cell number in peripheral blood.

Response to and toxicity of gemcitabine for recurrent ovarian cancer according to number of previous chemotherapy regimens.

AIM: Gemcitabine is used not only as a second-line, but also as a third-line or higher regimen for taxane/platinum-resistant recurrent ovarian cancer. The purpose of this study was to clarify the response to and toxicity of gemcitabine for recurrent ovarian cancer according to the number of previous chemotherapy regimens. METHODS: The subjects were patients with taxane/platinum-resistant recurrent ovarian cancer on gemcitabine treatment at the present hospital between June 2007 and September 2013. We retrospectively reviewed the medical records. Response and adverse events were assessed using the Response Evaluation Criteria in Solid Tumors version 1.1. and the Common Terminology Criteria for Adverse Events v4.0, respectively. RESULTS: The subjects consisted of 65 patients. The median number of previous chemotherapy regimens was 3 (range, 1-7). Overall response rate was 4.6%, and disease control rate (DCR) was 40.0%. DCR versus one, two, three, and ≥four previous chemotherapy regimens was 83.3%, 45.0%, 36.4%, and 23.5%, respectively. Grade 3/4 neutropenia, anemia, and thrombocytopenia occurred in 52.3%, 9.2%, and 9.2% of patients, respectively. Prevalence of grade 3/4 neutropenia according to one, two, three, and ≥four previous chemotherapy regimens was 66.7%, 55.0%, 54.5%, and 41.2%, respectively. Prevalence of anemia, thrombocytopenia, and almost all the non-hematological toxicities also did not increase with an increase in the number of previous chemotherapy regimens. CONCLUSIONS: Although DCR decreased as the number of previous chemotherapy regimens increased, the toxicities did not increase. Gemcitabine may be relatively safe in heavily pretreated ovarian cancer patients.

Successful pregnancy in a Peutz-Jeghers syndrome patient with lobular endocervical glandular hyperplasia.

Lobular endocervical glandular hyperplasia (LEGH) is histologically similar to minimal deviation adenocarcinoma (MDA), but classified as a benign disease. Although MDA often develops in Peutz-Jeghers syndrome (PJS) patients, there have been only a few reports on PJS with LEGH. We report a PJS patient who was diagnosed with LEGH by conization and delivered a baby 42 months later. She was referred to our department for multicystic lesions in the uterine cervix at 26 years old. Diagnostic conization was performed, and the histopathological diagnosis was LEGH. As the possibility of MDA could not be ruled out because of concomitant PJS, hysterectomy was considered. However, course observation was selected because the patient strongly wished to preserve fertility. She delivered a baby at 30 years old. The finding that PJS patients may be complicated by LEGH is very important. Loss of fertility by over-treatment should be avoided if patients desire its preservation.

Transglutaminase catalyzed dissociation and association of protein-polyamine complex.

Transglutaminase 2 (TG2) has been reported to be involved in cell growth through the formation of epsilon-(gamma-glutamyl) lysine (Gln-Lys) or N-(gamma-glutamyl) polyamine (Gln-polyamine). We have recently reported that the inhibition of Gln-Lys cross-linking by the formation of Gln-spermidine led to the increase of DNA synthesis in regenerating rat liver. TG2 may catalyze the replacement reaction between Lys residues in protein and polyamines. In the present study, we attempted to develop an experimental model for ascertaining this replacement reaction. We examined whether or not TG2 exhibited the association and dissociation reaction of Gln-polyamine bond in protein, using N,N-dimethylcasein (DC). The dissociated polyamines were identified by autoradiography. The dissociation of [(14)C] polyamines from DC bond [(14)C] polyamines complex by TG2 could occur in the presence of non-radioactive polyamines as second amine donor, whereas in the absence, could not almost occur. Moreover, it was indicated that this release of old [(14)C] polyamine bonded to DC was due to binding of added new [(14)C] polyamine to Gln residues in DC. These results demonstrate that TG2 catalyzes the replacement reaction between added [(14)C] polyamine and DC bond [(14)C] polyamine. The dissociation and association reaction may both occur together, the new DC-polyamine complex being formed at the same time as the dissociation of old DC-polyamine complex, since readying a second amine donor is necessary to dissociate DC-polyamine complex. These results indicate that this experimental model is successful in the study of TG2-catalyzed dissociation and association reaction of Gln-polyamine bond in protein.

Simple preparation of baicalin from Scutellariae Radix.

A simple, rapid and reproducible method was developed to isolate high-purity baicalin from Scutellariae Radix, the dried roots of Scutellaria baicalensis Georgi. The method involves partition/recrystallization steps without repeated column chromatography or special instruments. Isolated baicalin was characterized by comparisons of TLC, HPLC, IR, MS, and NMR data with an authentic sample. Moreover, beta-glucuronidase hydrolysis of baicalin sequentially yielded glucuronic acid and baicalein as confirmed by co-TLC with authentic samples. The purity of baicalin was more than 97% with yield ca. 8.7% (w/w). The method presented here appears suitable for commercial application.

Detection limit used for early warning in public health surveillance.

A theory of detection limit, developed in analytical chemistry, is applied to public health surveillance to detect an outbreak of national emergencies such as natural disaster and bioterrorism. In this investigation, the influenza epidemic around the Tokyo area from 2003 to 2006 is taken as a model of normal and large-scale epidemics. The detection limit of the normal epidemic is used as a threshold with a specified level of significance to identify a sign of the abnormal epidemic among the daily variation in anti-influenza drug sales at community pharmacies. While auto-correlation of data is often an obstacle to an unbiased estimator of standard deviation involved in the detection limit, the analytical theory (FUMI) can successfully treat the auto-correlation of the drug sales in the same way as the auto-correlation appearing as 1/f noise in many analytical instruments.

Involvement of retinoic acid-induced transglutaminase activity in zonal differences of hepatocyte proliferation after partial hepatectomy.

BACKGROUND: The authors have recently demonstrated that there is inverse correlation between transglutaminase (TGase) activity and DNA synthesis in periportal hepatocytes (PPH) and perivenous hepatocytes (PVH) at 1 day after partial hepatectomy in rats. In order to ensure the involvement of TGase in the differential growth capacities between periportal and perivenous regions of regenerating liver, the aim of this study was to investigate the effect of retinoic acid, an inducer of TGase expression, on zonal differences of hepatocyte proliferation between PPH and PVH isolated from regenerating rat liver. METHODS: Regenerating liver was prepared by 70% partial hepatectomy. PPH and PVH subpopulations were isolated by the digitonin/collagenase perfusion technique. Cell cycle was evaluated for incorporation of BrdU into hepatocytes and detected by flow cytometric analysis. TGase activity was determined by incorporation of 14C-putrescine into dimethylcasein. RESULTS: When retinoic acid was injected immediately after partial hepatectomy, TGase activity greatly increased in both PPH and PVH at 1 day after partial hepatectomy, and activity was higher in PPH than in PVH. DNA synthesis in both subpopulations did not increase 1 day after partial hepatectomy, with peaks of DNA synthesis shifting to 2 days, and synthesis was higher in PVH than in PPH. CONCLUSION: These results suggest that TGase might be involved in differential growth capacities between periportal and perivenous regions of regenerating rat liver after partial hepatectomy.

Zonal differences in DNA synthesis and in transglutaminase activity between perivenous versus periportal regions of regenerating rat liver.

We investigated a relationship within zonal differences in DNA synthesis and in transglutaminase (TGase) activity between perivenous versus periportal regions of regenerating rat liver. Using the digitonin/collagenase perfusion technique, hepatocyte subpopulations were isolated from each region at various time points after partial hepatectomy. The amounts of DNA synthesis as well as the levels of TGase mRNA and activity in each subpopulation were measured. Although increased DNA synthesis was observed in both subpopulations with a peak at 24 h after partial hepatectomy, the amount of DNA synthesis in periportal hepatocytes (PPH) was twice as much as that in perivenous hepatocytes (PVH). In PVH, TGase activity peaked at 24 h after partial hepatectomy with a preceding increase in its mRNA expression at 12 h, whereas TGase activity in PPH at 24 h was one-half of that in PVH. As TGase is known to have a growth-arresting activity, our data indicate that relatively higher TGase activity in PVH at 24 h after partial hepatectomy might correlate with relatively lower DNA synthesis in this region compared to periportal region.