Evaluation of storage conditions and periods for a three-drug anesthetic mixture in mice.

The three-drug anesthetic mixture (medetomidine, midazolam and butorphanol), developed as an injectable anesthetic for laboratory animals, has been verified from various perspectives and applied to mice and other laboratory animals. However, the effects of its storage conditions and periods on its efficacy have not yet been studied. This study investigated the mixture's efficacy after storage under various conditions (room temperature, 4°C and -20°C) for 1 and 2 years.

Characteristics of pectens in diurnal and nocturnal birds and a new functional proposal relating to non-visual opsins.

The pecten is a fold-structured projection at the ocular fundus in bird eyes, showing morphological diversity between the diurnal and nocturnal species. However, its biological functions remain unclear. This study investigated the morphological and histological characteristics of pectens in wild birds.

Establishment of African pygmy mouse induced pluripotent stem cells using defined doxycycline inducible transcription factors.

Mus minutoides is one of the smallest mammals worldwide; however, the regulatory mechanisms underlying its dwarfism have not been examined. Therefore, we aimed to establish M. minutoides induced pluripotent stem cells (iPSCs) using the PiggyBac transposon system for applications in developmental engineering.

Characteristic amino acid residues in the growth hormone receptor gene on underlying dwarfism.

The African pygmy mouse ( ) displays a dwarfism phenotype distinctive from closely related species. This study aimed to investigate the growth hormone receptor (Ghr) gene sequence in . We identified several amino acid variations, including the P469L mutation.

Verification of the efficacy of deciduae for determining the genetic type of mouse embryos.

Mouse embryos in the early-implantation stage require manipulation under a microscope. While the extraction of DNA, RNA and proteins from a single sample allows for both determination of genetic type and analysis of gene expression, whole mount analysis is not possible. In this study, we explored the applicability of PCR using extraembryonic tissues, especially the decidual side tissue after isolating the embryos from implantation sites to establish a method for determining the genetic type of embryos.

Mouse embryonic stem cells maintain differentiation potency into somatic lineage despite alternation of ploidy.

Vertebrates, including mammals, are considered to have evolved by whole genome duplications. Although some fish have been reported to be polyploids that have undergone additional genome duplication, there have been no reports of polyploid mammals due to abnormal development after implantation. Furthermore, as the number of physiologically existing tetraploid somatic cells is small, details of the functions of these ploidy-altered cells are not fully understood.

Histological analysis of implanted embryos in large Japanese field mouse (Apodemus speciosus) and estimation of developmental stage.

The large Japanese field mouse (Apodemus speciosus) is a small rodent species endemic to Japan. The genetic characteristics of A. speciosus include different chromosome numbers within the same species.

Characterization and expression of DNA sequences encoding the growth hormone gene in African Pygmy Mouse (Mus minutoides).

We determined the nucleotide sequence of the growth hormone (Gh) gene in Mus minutoides, one of the smallest mammals, where was predicted to be distinct in the functional regions between M. minutoides and Mus musculus. To investigate the evolutionary characteristics of Gh in M.

Establishment of a novel method for the production of chimeric mouse embryos using water-in-oil droplets.

Production of chimeric animals is often a necessity for the generation of genetically modified animals and has gained popularity in recent years in regenerative medicine for the reconstruction of xenogeneic organs. Aggregation and injection methods are generally used to produce chimeric mice. In the aggregation method, the chimeras are produced by co-culturing embryos and stem cells, and keeping them physically adhered, although it may not be an assured method for producing chimeric embryos.

Hyper-polyploid embryos survive after implantation in mice.

Polyploids generated by natural whole genome duplication have served as a dynamic force in vertebrate evolution. As evidence for evolution, polyploid organisms exist generally, however there have been no reports of polyploid organisms in mammals. In mice, polyploid embryos under normal culture conditions normally develop to the blastocyst stage.

Induction of pluripotency in mammalian fibroblasts by cell fusion with mouse embryonic stem cells.

Background: Cell fusion is a phenomenon that is observed in various tissues in vivo, resulting in acquisition of physiological functions such as liver regeneration. Fused cells such as hybridomas have also been produced artificially in vitro. Furthermore, it has been reported that cellular reprogramming can be induced by cell fusion with stem cells.

Aggregation recovers developmental plasticity in mouse polyploid embryos.

Tetraploid embryos normally develop into blastocysts and embryonic stem cells can be established from tetraploid blastocysts in mice. Thus, polyploidisation does not seem to be so harmful during preimplantation development. However, the mechanisms by which early mammalian development accepts polyploidisation are poorly understood.

Paraffin-embedded vertical sections of mouse embryonic stem cells.

Cultured cells are generally observed through the bottom of dishes or flasks using an inverted microscope. Two-dimensional and horizontal observation is insufficient for histological analysis of several cell lines, such as embryonic stem cells or cancer cells, because they form three-dimensional colonies. In the present study, we aimed to establish a more informative method for analysis of such stereoscopic cultured cells.

Effects of whole genome duplication on cell size and gene expression in mouse embryonic stem cells.

Alterations in ploidy tend to influence cell physiology, which in the long-term, contribute to species adaptation and evolution. Polyploid cells are observed under physiological conditions in the nerve and liver tissues, and in tumorigenic processes. Although tetraploid cells have been studied in mammalian cells, the basic characteristics and alterations caused by whole genome duplication are still poorly understood.

Tetraploid Embryonic Stem Cells Maintain Pluripotency and Differentiation Potency into Three Germ Layers.

Polyploid amphibians and fishes occur naturally in nature, while polyploid mammals do not. For example, tetraploid mouse embryos normally develop into blastocysts, but exhibit abnormalities and die soon after implantation. Thus, polyploidization is thought to be harmful during early mammalian development.

Nutrient starvation affects expression of LC3 family at the feto-maternal interface during murine placentation.

LC3 - the mammalian homolog of Atg8 - was found as autophagosome membrane binding protein in mammals and widely used as an autophagosomal marker. LC3A, B and C show different expression patterns in each tissue. The aim of this study was to reveal the differences of expression patterns among LC3 families in mouse placenta under normal condition and nutrient starving condition.

Dynamics and reproductive effects of complement factors in the spontaneous abortion model of CBA/J×DBA/2 mice.

The complement system is one component of innate immunity that could participate in fetal loss. We have already reported that adipsin, a complement activator in the alternative pathway, is stably expressed in the placenta and that an increase in this expression is related to spontaneous abortion. However, complement inhibitor Crry was concurrently expressed in the placenta, and the role of complement factors during pregnancy was not clear.

Discoidin domain receptor 2 (DDR2) regulates body size and fat metabolism in mice.

Discoidin domain receptor 2 (DDR2) is a receptor tyrosine kinase that is activated by fibrillar collagens, which act as its endogenous ligand. DDR2 regulates cell proliferation, cell adhesion, migration, extracellular matrix remodeling and reproductive functions. Both DDR2 null allele mice and mice with a recessive, loss-of-function allele for Ddr2 exhibit dwarfing and a reduction in body weight.

Characteristic patterns of maternal and fetal arterial construction in the rabbit placenta.

We studied vascular structure of the rabbit placenta, especially on three-dimensional morphological patterns and developmental process. Basic structure of maternal arterial system was re-constructed during day 13-18 of pregnancy, forming main routes for blood supply through the arterial sinuses and radial arteries. Intra-villous spaces were drastically developed showing as branches from the terminal radial arteries.

Repeatable construction method for engineered zinc finger nuclease based on overlap extension PCR and TA-cloning.

Zinc finger nuclease (ZFN) is a useful tool for endogenous site-directed genome modification. The development of an easier, less expensive and repeatedly usable construction method for various sequences of ZFNs should contribute to the further widespread use of this technology. Here, we establish a novel construction method for ZFNs.

Regulation of embryonic size in early mouse development in vitro culture system.

Mammals self-regulate their body size throughout development. In the uterus, embryos are properly regulated to be a specific size at birth. Previously, size and cell number in aggregated embryos, which were made from two or more morulae, and half embryos, which were halved at the 2-cell stage, have been analysed in vivo in preimplantation and post-implantation development in mice.

Discoidin domain receptor 2 (DDR2) regulates proliferation of endochondral cells in mice.

Discoidin domain receptor 2 (DDR2) is a receptor tyrosine kinase that is activated by fibrillar collagens. DDR2 regulates cell proliferation, cell adhesion, migration, and extracellular matrix remodeling. The decrement of endogenous DDR2 represses osteoblastic marker gene expression and osteogenic differentiation in murine preosteoblastic cells, but the functions of DDR2 in chondrogenic cellular proliferation remain unclear.

Clinical features of bleb-related infection: a 5-year survey in Japan.

Purpose: To present clinical features and microbial data for bleb-related infections obtained by the 5-year-long Japan Glaucoma Society Survey of Bleb-related Infection (JGSSBI).

Methods: This multicentre prospective observational study was conducted in 82 clinical centres in Japan. A total of 170 bleb-related infections developed in 157 eyes of 156 patients during a 5-year period.