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Asian musk shrew

Keiko Takanami, Kaihei Inoue, Hiroki Mukai, Kei Tamura, Takamichi Jogahara, Sen-Ichi Oda, Mitsuhiro Kawata, Tatsuya Sakamoto, Hirotaka Sakamoto
Gastrin-releasing peptide (GRP) has recently been identified as an itch-signaling molecule in the primary afferents and spinal cord of rodents. However, little information exists on the expression and localization of GRP in the trigeminal somatosensory system other than in rats. We examined the generality of the trigeminal GRP system in mammals using two distinct species, suncus as a model of specialized placental mammals known to have a well-developed trigeminal sensory system and mice as a representative small laboratory animal...
December 28, 2016: Acta Histochemica et Cytochemica
Mami Miyado, Kenji Miyado, Akihiro Nakamura, Maki Fukami, Gen Yamada, Sen-Ichi Oda
Reciprocal epithelial-mesenchymal interactions and several signalling pathways regulate the development of the genital tubercle (GT), an embryonic primordium of external genitalia. The morphology of the adult male external genitalia of the Asian house musk shrew Suncus murinus (hereafter, laboratory name: suncus) belonging to the order Eulipotyphla (the former order Insectivora or Soricomorpha) differs from those of mice and humans. However, the developmental process of the suncus GT and its regulatory genes are unknown...
February 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
Kei Tamura, Yasuhisa Kobayashi, Asuka Hirooka, Keiko Takanami, Takumi Oti, Takamichi Jogahara, Sen-Ichi Oda, Tatsuya Sakamoto, Hirotaka Sakamoto
Several regions of the brain and spinal cord control male reproductive function. We previously demonstrated that the gastrin-releasing peptide (GRP) system, located in the lumbosacral spinal cord of rats, controls spinal centers to promote penile reflexes during male copulatory behavior. However, little information exists on the male-specific spinal GRP system in animals other than rats. The objective of this study was to examine the functional generality of the spinal GRP system in mammals using the Asian house musk shrew (Suncus murinus; suncus named as the laboratory strain), a specialized placental mammal model...
May 1, 2017: Journal of Comparative Neurology
Donald B Smith, Peter Simmonds, Shahid Jameel, Suzanne U Emerson, Tim J Harrison, Xiang-Jin Meng, Hiroaki Okamoto, Wim H M Van der Poel, Michael A Purdy
The family Hepeviridae consists of positive-stranded RNA viruses that infect a wide range of mammalian species, as well as chickens and trout. A subset of these viruses infects humans and can cause a self-limiting acute hepatitis that may become chronic in immunosuppressed individuals. Current published descriptions of the taxonomical divisions within the family Hepeviridae are contradictory in relation to the assignment of species and genotypes. Through analysis of existing sequence information, we propose a taxonomic scheme in which the family is divided into the genera Orthohepevirus (all mammalian and avian hepatitis E virus (HEV) isolates) and Piscihepevirus (cutthroat trout virus)...
October 2014: Journal of General Virology
D S Brown, R Burger, N Cole, D Vencatasamy, E L Clare, A Montazam, W O C Symondson
Re-introduction of rare species to parts of their historical range is becoming increasingly important as a conservation strategy. Telfair's Skinks (Leiolopisma telfairii), once widespread on Mauritius, were until recently found only on Round Island. There it is vulnerable to stochastic events, including the introduction of alien predators that may either prey upon it or compete for food resources. Consequently, skinks have been introduced to Ile aux Aigrettes, another small Mauritian island that has been cleared of rats...
August 2014: Molecular Ecology
Kathryn Polak, Louise M Freeman
Perineal muscles essential for copulatory functioning are innervated by Onuf's nucleus in humans and the spinal nucleus of the bulbocavernosus (SNB) and dorsolateral nucleus (DLN) in rats. These structures sexually differentiate as a result of developmental androgen exposure in most species examined. The homologous structure in the Asian musk shrew (Suncus murinus) is a single cluster in the lateral DLN/Onuf's position in the ventral horn of the spinal cord; these motoneurons innervate both the bulbocavernosus and ischiocavernosus muscles of the musk shrew...
July 30, 2010: Brain Research
Kalina Venkova, Helmut Thomas, Graeme L Fraser, Beverley Greenwood-Van Meerveld
OBJECTIVES: Motilin is the main gut peptide that stimulates propulsive motility in the upper gastrointestinal (GI) tract. Motilin receptors exist in the colon but little is known about their functional role, and species-dependent differences present a major obstacle to understanding the physiological significance and potential therapeutic implications of motilin receptors in the colon. Our study aimed to define whether a motilin receptor is functionally expressed in the colon of the Asian musk (or house) shrew (Suncus murinus) and to investigate the effect of a novel motilin receptor antagonist, TZP-201...
March 2009: Journal of Pharmacy and Pharmacology
Pragya D Yadav, Martin J Vincent, Stuart T Nichol
Thottapalayam (TPM) virus belongs to the genus Hantavirus, family Bunyaviridae. The genomes of hantaviruses consist of three negative-stranded RNA segments (S, M and L) encoding the virus nucleocapsid (N), glycoprotein (Gn, Gc), and polymerase (L) proteins, respectively. The genus Hantavirus contains predominantly rodent-borne viruses, with the prominent exception of TPM virus which was isolated in India in 1964 from an insectivore, Suncus murinus, commonly referred to as the Asian house shrew or brown musk shrew...
2007: Virology Journal
Megumi Kurachi, Yoshi Kawamoto, Yuji Tsubota, Ba-Loc Chau, Vu-Binh Dang, Tashi Dorji, Yoshio Yamamoto, Maung Maung Nyunt, Yoshizane Maeda, Loan Chhum-Phith, Takao Namikawa, Takahiro Yamagata
The musk shrew (Suncus murinus) is an insectivore species that inhabits tropical and subtropical Asia widely. To clarify the genetic relationship among wild musk shrew populations, we examined the electrophoretic variants of biparentally inherited genetic markers at 10 loci coding for eight blood proteins/enzymes in a total of 639 animals and compared the results obtained from the mitochondrial DNA data. The principal-component analysis performed using the allele frequency data revealed that the 17 populations could be divided into two major groups, a South Asian group and a Southeast Asian group that includes several island populations bound by Myanmar...
August 2007: Biochemical Genetics
Megumi Kurachi, Ba-Loc Chau, Vu-Binh Dang, Tashi Dorji, Yoshio Yamamoto, Maung Maung Nyunt, Yoshizane Maeda, Loan Chhum-Phith, Takao Namikawa, Takahiro Yamagata
The musk shrew (Suncus murinus) is a small mammalian species belonging to Insectivora. It is widely distributed in Asia. To identify the genetic relationship among wild musk shrew populations and examine its migration route, we investigated the populations of Cambodia and Bhutan by using mitochondrial DNA restriction fragment length polymorphism analysis and compared them with other Asian populations previously described. Four haplotypes were detected in Cambodia and eight in Bhutan. A total of 53 haplotypes were detected in Asia and were classified largely into two groups, the Continental and Island types, based on a minimum spanning network...
April 2007: Biochemical Genetics
Tammy L Dellovade, Jean-Pierre Hardelin, Nadia Soussi-Yanicostas, Donald W Pfaff, Marlene Schwanzel-Fukuda, Christine Petit
Kallmann syndrome is hypogonadotropic hypogonadism coupled with anosmia. A morphological study found that the endocrine disorder in X-linked Kallmann syndrome is due to failed migration of gonadotropin releasing-hormone (GnRH) neurons from the olfactory placode to the brain during development. Anosmia results from agenesis of the olfactory bulbs and tracts. The gene responsible for the X-linked form of Kallmann syndrome, KAL-1, has been characterized. The orthologues of KAL-1 have been isolated in the chick and the zebrafish, but still await identification in rodents...
February 16, 2003: Brain Research. Developmental Brain Research
J M Bedford, G W Cooper, D M Phillips, G L Dryden
Insectivora are of special interest as the most primitive of the eutherian mammals, but essentially nothing is known of their gamete function. In this respect, the Asian musk shrew (Suncus murinus), investigated in the present study, displays many idiosyncrasies. In the epididymis, the giant acrosome undergoes further stabilization, its unusual resilience being especially evident in a "rim" created by a persistent close alignment of the outer acrosomal and overlying plasma membranes. However, until spermatozoa reached a gland on the vas deferens, no post-testicular change was demonstrable in the sperm head surface, the unusual nature of which was indicated by a dorso-ventral differentiation, by an inability to auto-agglutinate or to bind to the homologous zona pellucida, and by an insensitivity to anti-sperm immunoglobulin IgG in fresh serum...
April 1994: Biology of Reproduction
T Yamagata, K Ohishi, M O Faruque, J S Masangkay, C Ba-Loc, D Vu-Binh, S S Mansjoer, H Ikeda, T Namikawa
The musk shrew (Suncus Murinus) is widely distributed throughout Asia and East Africa. The mitochondrial DNA (mtDNA) of this species was analyzed in individuals from 31 local populations in nine Asian countries and Mauritius, using 17 restriction endonucleases. Although fourteen and nine mtDNA haplotypes were detected from Bangladesh and Nepal, respectively, one to four haplotypes were found in each Southeast Asian country, and one common haplotype existed in Japan, Philippines, Vietnam, Thailand and Indonesia...
June 1995: Idengaku Zasshi
D A Keefer, G L Dryden
No abstract text is available yet for this article.
May 1982: General and Comparative Endocrinology
G L Dryden, R Gossrau, H E Dale
No abstract text is available yet for this article.
1971: Pflügers Archiv: European Journal of Physiology
Y Tsubota, T Namikawa
Among nine laboratory shrew lines originating from the Japanese islands (Nag, Tok, TKU, Ize, Tr and OKI lines), West Java (Bog), Bangladesh (BAN) and Sri Lanka (SRI), Nag, Tr and Bog were fixed with Amy-1b and SRI with Amy-1a. The remaining lines were still highly polymorphic with the two alleles. A new electrophoretic band C was found in the BAN line and concluded to be expressed by a codominant allele, Amy-1c, which was carried by a single heterozygous female from among eleven wild shrews of the original breeding stock...
April 1988: Jikken Dobutsu. Experimental Animals
R L Sprando, M Branis, G L Dryden
The development of retinal cysts in the eye primordia of Suncus murinus embryos was studied. Retinal infoldings were first identified in the 17.5-day-old embryo (crown rump length--CRL = 6.3 mm). At this time, the apex of the developing retinal fold could be identified attached to the lens. The pigmented epithelium did not take part in the formation of the cyst. The retinal fold closed, to form a cyst, by day 23 of embryonic development (CRL = 14.0 mm). The newly formed retinal cyst remained continuous with the retina and extended toward the lens where it attached to the lens epithelium...
February 1990: Journal of Comparative Pathology
J E Fortune, J J Eppig, E F Rissman
Asian musk shrews (Suncus murinus) are induced ovulators, but exhibit no cyclic changes in reproductive structures or in sexual behavior. Mating behavior is induced by contact with a male. To determine if mating induces changes in ovarian steroidogenesis, ovaries removed from unmated animals and at 3, 10, 15, and 36 h after mating were cultured for 4 h in the presence or absence of gonadotropins (LH + FSH, 1 microgram/ml). Histological analysis revealed no obvious changes in follicular size or appearance at the end of culture in ovaries cultured at 3 and 10 h post-mating, as compared with ovaries from unmated shrews, and mating did not stimulate any discernable changes in steroid secretion in these two groups...
May 1992: Biology of Reproduction
G L Dryden, J N Anderson
Uterine and vaginal weights and histologies are not altered by ovariectomy or estrogen treatment in the Asian musk shrew (Suncus murinus). In addition, ovariectomized shrews mate. Thus, the role of ovarian hormones in the control of the reproductive status of this species does not conform to the accepted mammalian pattern.
August 19, 1977: Science
J K Koehler
The fine structure of spermatozoa of the Asian musk shrew, Suncus murinus, has been investigated using air-dried and critical-point-dried replicas in addition to freeze-fractured specimens. Asymmetry in the structure of the head, notable the acrosome, can be recognized in critical-point-dried replicas as a slight dorsoventral convexity not apparent in air-dried specimens. Freeze-etching reveals a dense accumulation of intramembranous particles just anterior to the posterior ring, but relatively few other characteristic membrane conformations associated with the head...
June 1977: American Journal of Anatomy
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