PCSK9 inhibitor use during pregnancy in a case of familial hypercholesterolemia complicated with coronary artery disease.

Limited data have been reported on the use of proprotein convertase subtilisin/kexin type 9 (PCSK 9) inhibitors during pregnancy in women with familial hypercholesterolemia (FH). Here, we present the first case of initiating evolocumab (PCSK9 inhibitor) in a compound heterozygous FH mother. The patient was a 34-year-old primipara with severe dyslipidemia and a history of coronary artery bypass surgery. An elevated low-density lipoprotein cholesterol (LDL-C) level of 420 mg/dL was detected in the first trimester and persistently increased throughout pregnancy. Evolocumab was administered at 31 and 35 weeks of gestation, showing a positive effect on stabilizing LDL-C levels. Planned delivery with labor analgesia was performed at 38 + 4 weeks. Both the mother and infant were discharged without any notable complications. Hence, evolocumab, an IgG2 monochromatic antibody with little placental permeability, may be an alternative medication with limited influence on infants. Further studies are needed to assess the safety of evolocumab administration during pregnancy.

Postpartum hair loss is associated with anxiety.

AIM: This study examined the relationship between postpartum hair loss and psychological symptoms. METHODS: This questionnaire-based, cross-sectional study included postpartum women who had delivered at two facilities and completed the questionnaire 10-18 months after delivery. Study protocols were sent by mail in two parts. Baseline characteristics and information regarding the pregnancy, delivery, childcare, and postpartum hair loss were obtained via a questionnaire. Psychological symptoms were assessed via the Whooley Questions, Generalized Anxiety Disorder 2-item, and Edinburgh Postnatal Depression Scale. Participants were divided into two groups based on psychological symptoms. Multivariate analyses were performed. RESULTS: In total, 331 responses were analyzed. Women with very much hair loss felt significantly more anxious than those with no postpartum hair loss, as reported on the Generalized Anxiety Disorder 2-item anxiety subscale (odds ratio: 4.47). Multiple logistic regression analysis revealed that primiparity, greater amount of postpartum hair loss, and higher Athens Insomnia Scale scores were predictors of Generalized Anxiety Disorder 2-item anxiety. Adjusted odds ratio of having anxiety among those with very much postpartum hair loss was 4.58 (95% confidence interval, 1.18-17.74) compared to those with no postpartum hair loss. CONCLUSIONS: A greater amount of postpartum hair loss was independently associated with postpartum anxiety on the Generalized Anxiety Disorder 2-item.

COVID-19 mRNA vaccination status and concerns among pregnant women in Japan: a multicenter questionnaire survey.

BACKGROUND: mRNA vaccination is an effective, safe, and widespread strategy for protecting pregnant women against infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. However, information on factors such as perinatal outcomes, safety, and coverage of mRNA vaccinations among pregnant women is limited in Japan. Therefore, this study aimed to investigate the perinatal outcomes, coverage, adverse effects, and short-term safety of mRNA vaccination as well as vaccine hesitancy among pregnant women. METHODS: We conducted a multicenter online survey of postpartum women who delivered their offspring at 15 institutions around Tokyo from October 2021 to March 2022. Postpartum women were divided into vaccinated and unvaccinated groups. Perinatal outcomes, COVID-19 prevalence, and disease severity were compared between the two groups. Adverse reactions in the vaccinated group and the reasons for being unvaccinated were also investigated retrospectively. RESULTS: A total of 1,051 eligible postpartum women were included. Of these, 834 (79.4%) had received an mRNA vaccine, while 217 (20.6%) had not, mainly due to concerns about the effect of vaccination on the fetus. Vaccination did not increase the incidence of adverse perinatal outcomes, including fetal morphological abnormalities. The vaccinated group demonstrated low COVID-19 morbidity and severity. In the vaccinated group, the preterm birth rate, cesarean section rate, and COVID-19 incidence were 7.2%, 33.2%, and 3.3%, respectively, compared with the 13.7%, 42.2%, and 7.8% in the unvaccinated group, respectively. Almost no serious adverse reactions were associated with vaccination. CONCLUSIONS: mRNA vaccines did not demonstrate any adverse effects pertaining to short-term perinatal outcomes and might have prevented SARS-CoV-2 infection or reduced COVID-19 severity. Concerns regarding the safety of the vaccine in relation to the fetus and the mother were the main reasons that prevented pregnant women from being vaccinated. To resolve concerns, it is necessary to conduct further research to confirm not only the short-term safety but also the long-term safety of mRNA vaccines.

Obstetric management of a patient with Andersen-Tawil syndrome: A case report.

Andersen-Tawil syndrome (ATS) is a rare hereditary long QT syndrome type 7 caused by a missense mutation in the KCNJ2 gene. ATS is characterized by ventricular arrhythmia, periodic limb paralysis and minor external malformations. Although only three reports of pregnant women with Andersen-Tawil syndrome have been reported to date, no exacerbation of ventricular arrhythmia was observed from pre-partum to delivery in all cases compared to that before pregnancy, and it was suggested that the risk of arrhythmic events from pre-partum to delivery is not high. Unlike these previous reports, we herein present a case of Andersen-Tawil syndrome in which ventricular arrhythmias increased and sustained ventricular tachycardia was developed during labor progression. We also advise caution that pregnant patients with Andersen-Tawil syndrome may have varying times of exacerbation of the arrhythmia, and ventricular arrhythmias may be associated with painful uterine contractions.

Placenta accrete after a frozen-thawed embryo transfer in a systemic lupus erythematosus patient treated with hydroxychloroquine.

Placenta accreta (PA) is a life-threatening disorder associated with decidual maldevelopment and a thin endometrium. Few cases of systemic lupus erythematosus (SLE) pregnancy complicated by PA have been reported, and the background pathophysiology remains elusive. Here, we report a case of PA in SLE pregnancy treated with hydroxychloroquine. A nulligravida woman with SLE, aged 41 years, visited our hospital because of infertility problems. Her SLE was treated with prednisolone and tacrolimus. We conducted assisted reproductive technology and gained several embryos. An artificial cycle successfully prepared the endometrium for embryo transfer with sufficient thickness. Over time, her SLE exacerbated, and we started hydroxychloroquine administration. Consequently, the endometrium did not respond to hormonal supplementation and remained thin, but we transferred the embryo and managed to achieve pregnancy. On the 38th week of gestation, we conducted labor induction because of elevated blood pressure. Induction was not effective, so we performed cesarean section; PA was observed. We performed compression suturing and were able to stop the hemorrhage. Postoperative uterine infarction and pelvic infection were successfully managed with conservative treatment. The present case highlights the use of hydroxychloroquine during endometrial development and contributes evidence regarding the pathogenesis of PA in pregnancy complicated by SLE.

Pregnancy outcomes in female childhood cancer survivors: Nationwide survey in Japan.

BACKGROUND: The aim of this study was to investigate the outcomes of pregnancy in female childhood cancer survivors (CCS) in Japan, to encourage greater attention to the reproductive health of CCS. METHODS: This was a retrospective nationwide questionnaire survey of delivery at ≥22 weeks of gestation in CCS at perinatal centers registered with the Japanese Perinatologists Association between 2010 and 2014. We evaluated the maternal characteristics, pregnancy and neonatal outcomes and the relationship between cancer treatment and these outcomes. RESULTS: The total number of CCS was 61, and the total number of deliveries was 71, corresponding to 0.019% of total deliveries. Regarding cancer, 46% of the patients had had leukemia. Epilepsy was seen in seven (11%). Mean gestational age at delivery was 37.9 weeks. The rate of preterm delivery was 24%. Mean birthweight was 2,718 g. There were three congenital anomalies (4.2%). The rate of preterm delivery was higher and mean birthweight lower in the women treated with radiotherapy than in those without radiotherapy (42% vs 16%, P = 0.025; 2,436 ± 737 g vs 2,827 ± 483 g, P = 0.010). The adjusted OR of radiotherapy for preterm deliveries was 3.53 (P = 0.049). CONCLUSIONS: Although the number of deliveries by CCS was low in Japan, the pregnancy outcomes were favorable. The important points for managing pregnancy in CCS were preterm delivery as an obstetric complication, especially in CCS who had been treated with radiotherapy, and epilepsy as a maternal complication, which may be related to previously received treatment.

Longitudinal hematological change in uncomplicated twin pregnancies: The white blood cell count decreases through pregnancy after the first trimester.

OBJECTIVE: Longitudinal hematological changes throughout twin pregnancies have not been reported. This study aimed to reveal longitudinal changes in hematological indices in twin pregnancies. MATERIALS AND METHODS: We conducted a retrospective chart review of hematological changes in uncomplicated twin pregnancies delivered at ≥37 weeks of gestation between 2010 and 2013 and randomly selected uncomplicated singletons during the same period. A complete blood count and hemogram were performed as blood examinations in the first trimester (9-13 weeks), late second trimester (22-27 weeks), mid-third trimester (33-35 weeks, only in twin pregnancies), and late third trimester (36-38 weeks). We evaluated inter-trimester differences in hematological indices and compared the values between twin and singleton pregnancies in each trimester. RESULTS: The final analysis group included 60 twin pregnancies and 63 singleton pregnancies. The white blood cell (WBC) count in twin pregnancies decreased throughout the pregnancy after the first trimester and became significantly lower than that in singletons in the late third trimester. The WBC count showed only a slight decrease in the third trimester in singleton pregnancies, whereas it showed a marked decrease throughout the pregnancy in twin pregnancies. The marked decrease in the total WBC count in twin pregnancies is mainly due to a decrease in neutrophils. The red blood cell count and hemoglobin and hematocrit values in twin pregnancies showed more marked decreases in the second trimester than in singletons. No decrease was observed after the second trimester of pregnancy. The platelet count decreased in the third trimester of twin pregnancies. CONCLUSION: We clarified the longitudinal hematological changes in twin pregnancies that showed augmentation of or differed from those of singleton pregnancies. It should be specifically mentioned that the WBC count markedly decreased through pregnancy after the first trimester, which is a characteristic change in twin pregnancies.

The anti-phospholipid antibody-dependent and independent effects of periodontopathic bacteria on threatened preterm labor and preterm birth.

PURPOSE: Periodontal disease is considered to be a risk factor for threatened preterm labor (TPL) and preterm birth (PB), but pathogenic mechanisms have not yet been elucidated. We hypothesized that infection with periodontopathic bacteria may enhance thrombosis through molecular mimicry with TLRVYK peptides on beta-2 glycoprotein I, a target molecule in anti-phospholipid syndrome. This study aimed to examine the effects of periodontitis on TPL and PB. METHODS: Ninety-five pregnant women (47 TPL and 48 healthy subjects) participated. Periodontal clinical parameters and periodontopathic bacteria were examined. Molecular mimicry between TLRVYK peptides and homologous peptides on the periodontopathic bacteria was examined by enzyme-linked immunosorbent assay (ELISA) using rabbit polyclonal antibodies specific for the respective peptides (SIRVYK on Aggregatibacter actinomycetemcomitans, TLRIYT on Porphyromonus gingivalis, and TLALYK on Treponema denticola). Serum high-sensitivity C-reactive protein, anti-TLRVYK and anti-SIRVYK IgG antibodies were measured using ELISA. RESULTS: Among the rabbit antibodies specific for the bacterial homologous peptides, only anti-SIRVYK IgG antibody reacted with TLRVYK peptides. Multivariable analysis showed that anti-SIRVYK IgG antibody was significantly associated with diagnosis of TPL. Of 95 births, 14 (14.7 %) delivered preterm. The preterm birth rate was higher in the anti-SIRVYK IgG antibody >median group than in the ≤median group. Of the 47 TPL subjects 13 had PB, and ordinal logistic regression analysis revealed that past smoking, presence of P. gingivalis and anti-SIRVYK IgG antibody were significantly correlated with PB. CONCLUSIONS: Infection with P. gingivalis and the antibody response to SIRVYK might be associated with TPL and PB.

Investigation of exacerbating factors for postpartum hair loss: a questionnaire-based cross-sectional study.

Background: Although postpartum hair loss is believed to be common, there is little reliable information. Objective: We sought to examine the factors that were associated with postpartum hair loss and to elucidate factors correlated with its pathogenesis. Methods: We carried out a questionnaire-based cross-sectional study. The study participants were women who delivered at 2 facilities and filled the questionnaire 10-18 months after delivery. The survey questionnaire included baseline characteristics, pregnancy details, delivery, childcare, and extent of postpartum hair loss. We divided participants into 2 groups according to the absence or presence of postpartum hair loss and performed logistic regression analyses. Results: A total of 331 (21.0%) responses were analyzed; among these 304 (91.8%) women had postpartum hair loss. The average time for the start, peak, and end of hair loss was 2.9, 5.1, and 8.1 months, respectively. Women with hair loss had an earlier time of delivery, a lower birth weight, a higher preterm labor rate, and longer-term breastfeeding. Logistical regression analyses revealed that longer-term breastfeeding and preterm labor were independent predictors of postpartum hair loss. The adjusted odds ratio for postpartum hair loss in women who ended breastfeeding 6-12 months postpartum versus those who ended it after 12 months or more was 5.96 (95% confidence interval [CI] [1.68, 21.09]) and 6.37 (95% CI [1.95, 20.76]) compared with those who stopped breastfeeding within 6 months postpartum. Limitations: Finer details such as pregnancy complications and delivery information may not be accurate since all results are based on questionnaire responses. There may be a sampling bias because women who suffer from postpartum hair loss may tend to participate more frequently. Conclusion: Over 90% of women experienced postpartum hair loss. Our data show that long-term breastfeeding and preterm labor correlate with postpartum hair loss.

Acute loss of DP1, but not DP2, induces p53 mRNA and augments p21Waf1/Cip1 and senescence.

The transcription factors DP1 and DP2 have been implicated in crucial gene regulation as heterodimer partners of E2F; however, the functional differences between DP1 and DP2 remain poorly understood. To gain insight into DPs in human somatic cells, we first suppressed endogenous DP1 and DP2 using RNA interference and examined the effect of their loss on gene expression changes in HeLa cervical cancer cells. A DNA microarray and gene pathway analysis revealed that the suppression of well-known E2F/DP-regulated pathways, including the G1 to S phase transition of the cell cycle and DNA replication, was manifested in accordance with the acute loss of DP1 and DP2. On the other hand, the acute loss of DP1 and DP2 increased the p21Waf1/Cip1 mRNA level compared with the control RNA treatment. We further showed that the inactivation of DP1, but not DP2, resulted in mRNA induction for p53, an upstream regulator of p21Waf1/Cip1. Furthermore, in A549 lung cancer cells as well as HeLa cells, the mRNA and protein levels of p53 and p21Waf1/Cip1 were stabilized specifically upon DP1 depletion, whereas p53-regulated apoptotic factor BAX mRNA was unchanged. Finally, the impairment of DP1, but not DP2, increased senescence in HeLa, A549 and WI-38 diploid fibroblasts but not in p53 null Saos-2 osteosarcoma cells. Taken together, these results suggest that DP1, but not DP2, is uniquely involved in the regulation of the p53 and p21Waf1/Cip1 pathway, thereby augmenting senescence in human somatic cells.

Enforced expression of the transcription factor HOXD3 under the control of the Wnt1 regulatory element modulates cell adhesion properties in the developing mouse neural tube.

HOX genes expressed in a specific spatial and temporal manner play a crucial role in determining the body plan during the early development of vertebrates. In adult tissues, many HOX genes participate in normal hematopoiesis and carcinogenesis. We previously found that overexpression of the homeobox gene HOXD3 alters expression levels of cell adhesion molecules in human cancer cell lines. Here, we have investigated whether HOXD3 expression is related to the cell adhesion processes during mouse development focusing on dorsal midline cells or roof-plate cells of the neural tube and neural crest cells. We created transgenic mouse embryos, in which HOXD3 is expressed in the dorsal midline under the control of the Wnt1 regulatory element, and analyzed these embryos at embryonic day 10.5-13.5. In HOXD3-expressing transgenic embryos, although neural crest-derived structures in the trunk region appeared to be normal, striking abnormalities were found in the neural tube. In transgenic embryos expressing the lacZ gene under the control of the Wnt1 regulatory element, expression of lacZ was restricted to roof-plate cells within the neural tube. By contrast, in HOXD3-expressing transgenic embryos, expression of HOXD3 was not only located in the dorsal neural tube, but also had spread inside the ventricular zone in more ventral regions of the neural tube. These findings show that the HOXD3 transgene is expressed more broadly than the Wnt1 gene is normally expressed. Expression of both Wnt1 and Msx1, marker genes in the roof plate, was further extended ventrally in HOXD3-expressing embryos than in normal embryos, suggesting that expression of the HOXD3 transgene expands the roof plate ventrally within the neural tube. In the ventricular zone of HOXD3-expressing embryos at embryonic day 10.5, we observed an increase in the number of mitotic cells and failure of interkinetic nuclear migration of progenitor cells. Furthermore, in HOXD3-expressing embryos at embryonic day 12.5, the ventricular zone, in which progenitor cells became more loosely connected to each other, was composed of a large number of cells that did not express N-cadherin. Our results indicate that expression of HOXD3 is closely associated with modulation of cell-adhesive properties during embryonic development.

An ultrasonographic estimated fetal weight reference for Japanese twin pregnancies.

PURPOSE: The purpose was to establish an estimated fetal weight (EFW) reference for twin pregnancies in Japan and to compare the growth of twins with singletons. METHODS: We retrospectively investigated Japanese women who delivered live-born twins at our center during the period from 2010 to 2016. The main exclusion criteria were monoamniotic twins, fetal reduction, maternal complications, twin-twin transfusion syndrome, fetal congenital anomalies, and patients with their first visit after 16 weeks' gestation. The EFW was measured longitudinally from 16 to 37 weeks' gestation. We calculated the posterior predictive distribution using hierarchical Bayesian models and determined the EFW corresponding to each Z-score. RESULTS: A total of 364 women (190 dichorionic and 174 monochorionic) were included, and the total number of examinations was 3952. The EFWs of a Z-score of 0 for twins at 20, 28, and 36 weeks' gestation were 308, 1070, and 2294 g, respectively. The EFW of a Z-score of 0 for twins was 98-101% that of singletons until 21 weeks, gradually becoming lower than that of singletons and reaching 90-93% that of singletons after 27 weeks. CONCLUSION: We established an EFW reference for Japanese twin pregnancies. The EFW of twins is similar to that of singletons until the mid-second trimester, gradually becoming lower than that of singletons and reaching about 90% that of singletons in the third trimester.

Localization of the sulphonylurea receptor subunits, SUR2A and SUR2B, in rat renal tubular epithelium.

ATP-sensitive K+ (K(ATP)) channels in the kidney are considered to play roles in regulating membrane potential according to changes in the intracellular ATP concentration. They are composed of two types of subunits; the pore subunits (Kir6.1, Kir6.2), which are members of the inwardly rectifying K+ channel family, and the regulatory subunits, the sulphonylurea receptors, which belong to the ATP-binding cassette (ABC) superfamily. The sulphonylurea receptors (SURs) are receptors of sulphonylureas widely used for the treatment of type 2 diabetes mellitus. The SURs are divided into two isoforms, SUR1 and SUR2, the latter was further divided into SUR2A and SUR2B. In the present study, we have investigated the mRNA expression by RT-PCR assay, and protein expression profiles by immunoblotting, immunohistochemistry, and immunoelectron microscopy with anti SUR2A and anti SUR2B antibodies. RT-PCR detected the presence of mRNA transcripts of the SUR2A and SUR2B, while SUR1 mRNA was barely detected. In immunoblotting, SUR2A protein was detected distinctly in the microsomal fraction, weakly in the mitochondrial fraction and at negligible level in the cell membrane fraction. In contrast, the SUR2B protein was detected intensely in the microsomal fraction, with a low level in the mitochondrial fraction and scarcely in the cell membrane fraction. In immunohistochemistry SUR2A and SUR2B proteins were widely distributed in renal tubular epithelial cells, glomerular mesangial cells, and the endothelium and the smooth muscle of blood vessels. In immunoelectron microscopy, the immunoreactivity was localized in the endoplasmic reticulum and mitochondria throughout the epithelial cells for SUR2A, and dominantly in the apical cytoplasm of the cells for SUR2B. In conclusion, the regulatory subunits of the K(ATP) channel in the rat kidney are SUR2A and SUR2B; they also are candidate regulatory subunits for the mitochondrial K(ATP) channel.

[Effectiveness of combination learning of basic problem and free clinical topics in lecturing for lower grade students in pharmacy school].

To help pharmacy students develop applied knowledge concerning clinical diseases and the ability to communicate with patients (and medical staff), we have introduced a new improved program for first and second year pharmaceutical students. This new program involves a 10-20 minute presentation of a clinical disease and clinical case by the students after regular lectures. Our new program may be useful for a 6-year pharmacy education in order to produce pharmacy students who have: 1) wide clinical knowledge, 2) a better basis for understanding advanced subjects such as pharmacology, drug therapeutics and pathologic physiology that are taken in the upper grades, and 3) practical training at medical institutions. In addition, a pamphlet produced as part of the student presentation become reference data when students in the following year study the same topic or teachers of other professional subjects attempt a similar program.

Dynamics of an ultra-discrete SIR epidemic model with time delay.

We propose an ultra-discretization for an SIR epidemic model with time delay. It is proven that the ultra-discrete model has a threshold property concerning global attractivity of equilibria as shown in differential and difference equation models. We also study an interesting convergence pattern of the solution, which is illustrated in a two-dimensional lattice.

Localization of sulfonylurea receptor subunits, SUR2A and SUR2B, in rat heart.

To understand the possible functions and subcellular localizations of sulfonylurea receptors (SURs) in cardiac muscle, polyclonal anti-SUR2A and anti-SUR2B antisera were raised. Immunoblots revealed both SUR2A and SUR2B expression in mitochondrial fractions of rat heart and other cellular fractions such as microsomes and cell membranes. Immunostaining detected ubiquitous expression of both SUR2A and SUR2B in rat heart in the atria, ventricles, interatrial and interventricular septa, and smooth muscles and endothelia of the coronary arteries. Electron microscopy revealed SUR2A immunoreactivity in the cell membrane, endoplasmic reticulum (ER), and mitochondria. SUR2B immunoreactivity was mainly localized in the mitochondria as well as in the ER and cell membrane. Thus, SUR2A and SUR2B are not only the regulatory subunits of sarcolemmal K(ATP) channels but may also function as regulatory subunits in mitochondrial K(ATP) channels and play important roles in cardioprotection.

ATP-sensitive K+-channel subunits on the mitochondria and endoplasmic reticulum of rat cardiomyocytes.

ATP-sensitive K(+) (K(ATP)) channel subunits on the subcellular structures of rat cardiomyocytes were studied with antibodies against Kir6.1 and Kir6.2. According to the results of Western blot analysis, Kir6.1 was strongly expressed in mitochondrial and microsome fractions, and faintly expressed in cell membrane fraction, whereas Kir6.2 was mainly expressed in the microsome fraction and weakly in cell membrane and mitochondrial fractions. Immunohistochemistry showed that Kir6.1 and Kir6.2 were expressed in the endocardium, atrial and ventricular myocardium, and in vascular smooth muscles. Immunoelectron microscopy revealed that Kir6.1 immunoreactivity was mainly localized in the mitochondria, whereas Kir6.2 immunoreactivity was mainly localized in the endoplasmic reticulum and a few in the mitochondria. Both Kir6.1 and Kir6.2 are candidates of mitochondrial K(ATP) channel subunits. The data obtained in this study will be useful for analyzing the composition of K(ATP) channels of cardiomyocytes and help to understanding the cardioprotective role of K(ATP) channels during heart ischemia.

[Introduction of active learning and student readership in teaching by the pharmaceutical faculty].

We have introduced improvements and new approaches into our teaching methods by exploiting 4 active learning methods for pharmacy students of first year. The 4 teaching methods for each lesson or take home assignment are follows: 1) problem-based learning (clinical case) including a student presentation of the clinical case, 2) schematic drawings of the human organs, one drawing done in 15-20 min during the week following a lecture and a second drawing done with reference to a professional textbook, 3) learning of professional themes in take home assignments, and 4) short test in order to confirm the understanding of technical terms by using paper or computer. These improvements and new methods provide active approaches for pharmacy students (as opposed to passive memorization of words and image study). In combination, they have proven to be useful as a learning method to acquire expert knowledge and to convert from passive learning approach to active learning approach of pharmacy students in the classroom.

Localization of pore-forming subunit of the ATP-sensitive K(+)-channel, Kir6.2, in rat brain neurons and glial cells.

Kir6.2, a subunit of the ATP-sensitive K(+) channel (K(ATP)), was localized in adult rat brain by immunohistochemistry and in situ hybridization. The Kir6.2 mRNA was widely expressed in most rat brain neuronal populations and nuclei examined, intensely in the mitral cell layer and tufted cells of the olfactory bulb, pontine nucleus, pontine reticular nucleus, motor and spinal trigeminal nuclei and cuneate nuclei of the brain stem, moderately in the neocortex and cerebellar Purkinje cells, and weakly in the granular cell layer of the olfactory bulb and the granular layer of the cerebellum. In addition, glial cells also expressed the Kir6.2 gene weakly in the corpus callosum and cerebellar white matter. This wide localization of the gene was quite similar to that of Kir6.2 protein. Double stainings with anti-GFAP and anti-Kir6.2 antibodies were performed in this study. Glial cells showing immunoreactivity to both anti-Kir6.2 and anti-GFAP were confirmed to be astrocytes, and those showing only immunoreactivity to anti-Kir6.2 but not to anti-GFAP were presumed to be oligodendrocytes and confirmed by immunoelectron microscopy. Thus, it may be concluded that both oligodendrocytes and astrocytes contain Kir6.2. Under the electron microscope, we showed in vivo for the first time that the immunoreactive products were localized in the endoplasmic reticulum and Golgi apparatus as well as the plasma membranes of neurons and glial cells.

Rapid appearance of pathological changes of neurons and glia cells in the cerebellum of microsphere-embolized rats.

Neuropathological changes in the cerebellar cortex of microsphere-embolized rats were studied at 30 min and 3 h after the embolism. Necrotic processes including a sponge-like vacuolation in the molecular layer, a vague outline of some Purkinje cells, and a few pyknotic granule cells having small and dark profiles were identified at sometime between 30 min and 3 h after microsphere-induced embolism in Nissl staining. Glial fibrillary acidic protein staining shows an apparent reduction in the number of Bergmann glial processes in some of the areas where there was necrosis of the molecular layer and poor astroglia processes in the areas subjacent to the pyknotic granule cells. These data demonstrate that within a short time, microsphere-induced cerebral ischemia produces necrosis of cerebellar neurons (i.e. Purkinje and granule cells) and changes in cerebellar glia cells (i.e. Bergmann and astroglia cells), and that these neuropathological changes are secondary phenomenon caused by microsphere blockage of cerebellar blood flow.