19 results
Search Results
Now showing 1 - 10 of 19
Publication Metadata only Extreme aggression in male squid induced by a β-MSP-like pheromone(2011-02-22) Scott F. Cummins; Jean G. Boal; Kendra C. Buresch; Chitraporn Kuanpradit; Prasert Sobhon; Johanna B. Holm; Bernard M. Degnan; Gregg T. Nagle; Roger T. Hanlon; University of the Sunshine Coast; University of Queensland; Millersville University; Marine Biological Laboratory; Mahidol University; University of Southern California; Medical College of GeorgiaMale-male aggression is widespread in the animal kingdom and subserves many functions related to the acquisition or retention of resources such as shelter, food, and mates. These functions have been studied widely in the context of sexual selection, yet the proximate mechanisms that trigger or strengthen aggression are not well known for many taxa. Various external sensory cues (visual, audio, chemical) acting alone or in combination stimulate the complex behavioral interactions of fighting behaviors [1]. Here we report the discovery of a 10 kDa protein, termed Loligo β-microseminoprotein (Loligo β-MSP), that immediately and dramatically changes the behavior of male squid from calm swimming and schooling to extreme fighting, even in the absence of females. Females synthesize Loligo β-MSP in their reproductive exocrine glands and embed the protein in the outer tunic of egg capsules, which are deposited on the open sea floor. Males are attracted to the eggs visually, but upon touching them and contacting Loligo β-MSP, they immediately escalate into intense physical fighting with any nearby males. Loligo β-MSP is a distant member of the chordate β-microseminoprotein family [2] found in mammalian reproductive secretions, suggesting that this gene family may have taxonomically widespread roles in sexual competition. © 2011 Elsevier Ltd.Publication Metadata only Existence and distribution of gonadotropin-releasing hormone-like peptides in the central nervous system and ovary of the Pacific white shrimp, Litopenaeus vannamei(2011-03-01) Yotsawan Tinikul; Jaruwan Poljaroen; Parinyaporn Nuurai; Panat Anuracpreeda; Charoonroj Chotwiwatthanakun; Ittipon Phoungpetchara; Napamanee Kornthong; Tanes Poomtong; Peter J. Hanna; Prasert Sobhon; Mahidol University; Burapha University; Center for Research and Testing for Marine Animals; Deakin UniversityWe used antibodies against octopus gonadotropin-releasing hormone (octGnRH) and tunicate GnRH (tGnRH-I) in order to investigate the existence and distribution of GnRH-like peptides in the central nervous system (CNS) and in the ovary during various stages of the ovarian cycle of the white shrimp, Litopenaeus vannamei. OctGnRH-immunoreactive and tGnRH-I-immunoreactive neurons and fibers were present in several regions of the supraesophageal ganglion (brain), subesophageal ganglion (SEG), thoracic ganglia, and abdominal ganglia. In the brain, both octGnRH immunoreactivity (ir) and tGnRH-I-ir were detected in neurons of clusters 6, 11, 17, and associated fibers, and the anterior medial protocerebral, posterior medial protocerebral, olfactory, and tegumentary neuropils. In the SEG and thoracic ganglia, octGnRH-immunoreactive and tGnRH-I-immunoreactive neurons and fibers were present in dorsolateral and ventromedial cell clusters and in surrounding fibers. Only immunoreactive fibers were detected in the abdominal ganglia. In the ovary, both octGnRH and tGnRH-I were detected at medium intensity in the cytoplasm of early step oocytes (Oc2) and, at high intensity, in Oc3. Furthermore, octGnRH-ir and tGnRH-I-ir were intense in follicular cells surrounding Oc2 and Oc3. The presence of GnRH-ir in the CNS and ovary indicates that GnRH-like peptides occur in the white shrimp, and that GnRHs are involved in the reproductive process, especially ovarian maturation and the differentiation of oocytes, as reported in other species. © 2011 Springer-Verlag.Publication Metadata only Hexane extract of seaweed caulerpa lentillifera inhibits cell proliferation and induces apoptosis of human glioblastoma cells(2021-04-01) Varitta Tanawoot; Pornpun Vivithanaporn; Tanapan Siangcham; Krai Meemon; Nakorn Niamnont; Prasert Sobhon; Montakan Tamtin; Kant Sangpairoj; Faculty of Medicine Ramathibodi Hospital, Mahidol University; Faculty of Medicine, Thammasat University; Mahidol University; Burapha University; King Mongkut's University of Technology Thonburi; Phetcha Buri Coastal Aquaculture Research and Development CenterGlioblastoma is one the most aggressive types of brain cancers resistant to conventional anti-neoplastic drugs. Marine seaweeds possess valuable bioactive compounds for disease prevention and therapy, including for a number of cancers. Caulerpa... lentillifera is a tropical marine seaweed containing various minerals and bioactive ingredients. This study demonstrated the activity of C. lentillifera hexane extract (CLHE) against A172 human glioblastoma cells. The extract exerted growth-inhibitory effectsPublication Metadata only Identification of an attractin-like pheromone in the mucus-secreting hypobranchial gland of the abalone haliotis asinina linnaeus(2010-11-01) Chitraporn Kuanpradit; Scott F. Cummins; Bernard M. Degnan; Prapee Sretarugsa; Peter J. Hanna; Prasert Sobhon; Jittipan Chavadej; Mahidol University; University of Queensland; Deakin UniversityPheromones are chemicals used to communicate between animals of the same species, and are thought to be used by most marine animals. With limited vision, abalone primarily sense their world chemically, and pheromones may play an important role... marine molluscs has been classified as a sex auxiliary gland releasing unknown substances during spawning. In our study, cephalic tentacle assays demonstrated that the cell extracts of the hypobranchial gland contain chemical cues that are sensedPublication Metadata only Inhibitory effect of a reproductive-related serpin on sperm trypsin-like activity implicates its role in sperm maturation of Penaeus monodon(2018-03-01) Charoonroj Chotwiwatthanakun; Wanida Santimanawong; Prasert Sobhon; Somjai Wongtripop; Rapeepun Vanichviriyakit; Mahidol University; Burapha University; Shrimp Genetic Improvement Center© 2018 Wiley Periodicals, Inc. In a number of marine animals, sperm serine proteases are important for fertilization. Penaeus monodon sperm require trypsin-like activity for a complete acrosome reaction, which exclusively occurs in sperm residingPublication Metadata only Larval settlement of the tropical abalone, Haliotis asinina Linnaeus, using natural and artificial chemical inducers(2008-08-01) Praphaporn Stewart; Nantawan Soonklang; Michael J. Stewart; Chaitip Wanichanon; Peter J. Hanna; Tanes Poomtong; Prasert Sobhon; Mahidol University; Faculty of Medicine, Thammasat University; Deakin University; The Coastal Fisheries Research and Development CenterMany kinds of chemical and biological materials have been used as inducers of settlement of abalone larvae, as well as other species of marine gastropods, with responses being highly variable, even to the same chemical cue. The present study testedPublication Metadata only The presence of abalone egg-laying hormone-like peptide in the central nervous system and ovary of the Spotted Babylon, Babylonia areolata(2017-09-01) Jirawat Saetan; Piyakorn Boonyoung; Uraporn Vongvatcharanon; Thanapong Kruangkum; Kanjana Khornchatri; Pinij Thaweethamsewee; Prasert Sobhon; Prapee Sretarugsa; Prince of Songkla University; Mahidol University; Thammasat University; Burapha University© 2017 Elsevier GmbH Recently, the neuronal classification of the ivory shell Spotted Babylon, Babylonia areolata, was readily demonstrated. Regarding its importance as marine economic molluscan species, the attempt to understand the neuroendocrinePublication Metadata only Neuronal classification and distribution in the central nervous system of the female mud crab, Scylla olivacea(2014-03-01) Napamanee Kornthong; Yotsawan Tinikul; Kanjana Khornchatri; Jirawat Saeton; Sirilug Magerd; Saowaros Suwansa-Ard; Thanapong Kruangkum; Peter J. Hanna; Prasert Sobhon; Mahidol University; Thammasat University; Deakin UniversityThe mud crab, Scylla olivacea, is one of the most economically valuable marine species in Southeast Asian countries. However, commercial cultivation is disadvantaged by reduced reproductive capacity in captivity. Therefore, an understandingPublication Metadata only Holothuria scabra extracts exhibit anti-Parkinson potential in C. elegans: A model for anti-Parkinson testing(2018-07-03) Pawanrat Chalorak; Prapaporn Jattujan; Saksit Nobsathian; Tanate Poomtong; Prasert Sobhon; Krai Meemon; Mahidol University; Burapha University; Coastal Fisheries Research and Development Centerto cognitive and motor impairments. Nowadays, the drugs commonly used for PD treatment, such as levodopa, provide only symptomatic relief. Therefore, seeking new drugs against PD, especially from plants and marine organisms, is one of the major research areasPublication Metadata only An ethyl-acetate fraction of Holothuria scabra modulates inflammation in vitro through inhibiting the production of nitric oxide and pro-inflammatory cytokines via NF-κB and JNK pathways(2019-01-01) Kanta Pranweerapaiboon; Somjai Apisawetakan; Saksit Nobsathian; Arunporn Itharat; Prasert Sobhon; Kulathida Chaithirayanon; Faculty of Medicine, Thammasat University; Mahidol University; Burapha University; Srinakharinwirot University© 2019, Springer Nature Switzerland AG. Sea cucumber, Holothuria scabra, is an echinoderm marine animal that has long been used as a traditional therapeutic in various diseases due to its chemical composition and protein enrichment. Many researchers