keyword
MENU ▼
Read by QxMD icon Read
search

Sperm surface

keyword
https://www.readbyqxmd.com/read/29466382/mating-and-aggregative-behaviors-among-basal-hexapods-in-the-early-cretaceous
#1
Alba Sánchez-García, Enrique Peñalver, Xavier Delclòs, Michael S Engel
Among the many challenges in paleobiology is the inference and reconstruction of behaviors that rarely, if ever, leave a physical trace on the environment that is suitable for fossilization. Of particular significance are those behaviors tied to mating and courtship, individual interactions critical for species integrity and continuance, as well as those for dispersal, permitting the taxon to expand its distribution as well as access new habitats in the face of local or long-term environmental change. In this context, two recently discovered fossils from the Early Cretaceous amber of Spain (ca...
2018: PloS One
https://www.readbyqxmd.com/read/29448494/photocatalytic-degradation-of-oxytetracycline-by-ternary-mixed-catalyst-and-toxicity-assessment-using-boar-sperm
#2
Kefu Zhou, Xiao-Dan Xie, Xin-Yan Hu, Ming-Cheng Chen, Chang-Tang Chang
Response surface methodology was adopted to obtain ternary mixed catalysts of TiO2-loaded ZSM-5 zeolite and graphene. Oxytetracycline was used as challenged toxicant to evaluate the photocatalytic degradation efficiency of the composites. The optimal weight ratio of graphene, TiO2, and ZSM-5 was 1:8:1. The composites were characterized by ultraviolet-visible spectroscopy, X-ray diffraction, fourier transform infrared, N2 adsorption-desorption isotherms, and transmission electron microscope with an energy-dispersive spectroscopy system, etc...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29410678/actiflagelin-a-new-sperm-activator-isolated-from-walterinnesia-aegyptia-venom-using-phenotypic-screening
#3
Tarek Mohamed Abd El-Aziz, Sawsan Al Khoury, Lucie Jaquillard, Mathilde Triquigneaux, Guillaume Martinez, Sandrine Bourgoin-Voillard, Michel Sève, Christophe Arnoult, Rémy Beroud, Michel De Waard
Background: Sperm contains a wealth of cell surface receptors and ion channels that are required for most of its basic functions such as motility and acrosome reaction. Conversely, animal venoms are enriched in bioactive compounds that primarily target those ion channels and cell surface receptors. We hypothesized, therefore, that animal venoms should be rich enough in sperm-modulating compounds for a drug discovery program. Our objective was to demonstrate this fact by using a sperm-based phenotypic screening to identify positive modulators from the venom of Walterinnesia aegyptia...
2018: Journal of Venomous Animals and Toxins Including Tropical Diseases
https://www.readbyqxmd.com/read/29409138/treatment-of-semen-samples-with-%C3%AE-chymotrypsin-alters-the-expression-pattern-of-sperm-functional-proteins-a-pilot-study
#4
M K Panner Selvam, A Agarwal, R Sharma, L Samanta
Semen hyperviscosity delays the liquefaction of semen sample and is subjected to limited proteolysis by addition of α-chymotrypsin to reduce the viscosity. α-Chymotrypsin is a proteolytic enzyme involved in degradation of the proteins and polypeptides. Even though α-chymotrypsin improves the handling of hyperviscous samples, its effect on the sperm proteins is not clear. This study was aimed to evaluate the alteration in the expression of sperm functional proteins in samples treated with α-chymotrypsin...
February 6, 2018: Andrology
https://www.readbyqxmd.com/read/29385641/cellular-distribution-of-secretory-pathway-markers-in-the-haploid-synergid-cells-of-arabidopsis-thaliana
#5
Daniel S Jones, Xunliang Liu, Andrew C Willoughby, Benjamin E Smith, Ravishankar Palanivelu, Sharon A Kessler
In flowering plants, cell-cell communication plays a key role in reproductive success, as both pollination and fertilization require pathways that regulate interactions between many different cell types. Some of the most critical of these interactions are those between the pollen tube (PT) and the embryo sac, which ensure the delivery of the sperm cells required for double fertilization. Synergid cells function to attract the PT through the secretion of small peptides and in PT reception via membrane-bound proteins associated with the endomembrane system and the surface of the cell...
January 31, 2018: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29369695/integrin-heterodimers-expressed-on-the-surface-of-porcine-spermatogonial-stem-cells
#6
Min Hee Park, Min Seong Kim, Jung Im Yun, Jung Hoon Choi, Eunsong Lee, Seung Tae Lee
To date, in vitro culture systems able to sufficiently expand the small population of spermatogonial stem cells (SSCs), a tool for the development of sperm-mediated gene transfer techniques in transgenic pigs, in the porcine seminiferous tubule have not been reported. Therefore, as a step toward engineering a noncellular niche to support the in vitro maintenance of porcine SSC self-renewal, we investigated the types of integrin heterodimers that are expressed and functional on their membrane. The α and β integrin subunit protein expressions were analyzed using immunocytochemistry and fluorescence immunoassay, and the function of integrin heterodimers was confirmed by attachment and antibody inhibition assays...
January 25, 2018: DNA and Cell Biology
https://www.readbyqxmd.com/read/29363381/clinical-outcomes-of-magnetic-activated-sperm-sorting-in-infertile-men-candidate-for-icsi
#7
Niloofar Ziarati, Marziyeh Tavalaee, Mehrnoosh Bahadorani, Mohammad Hossein Nasr Esfahani
Magnetic activated cell sorting (MACS) with annexin V microbeads deselected apoptotic sperm with externalized phosphatidylserine (PS) residues on their surface and decrease chance of such sperm to be inseminated. Therefore, the aim of this study was to evaluate efficiency of MACS procedure in a prospective randomized trial. Sixty-two semen samples were allocated into two groups and processed according to: (i) a combination of MACS with density gradient centrifugation (MACS-DGC) as study group (N = 29); and (ii) DGC alone as a control group (N = 33)...
January 24, 2018: Human Fertility: Journal of the British Fertility Society
https://www.readbyqxmd.com/read/29358214/identification-of-jellyfish-neuropeptides-that-act-directly-as-oocyte-maturation-inducing-hormones
#8
Noriyo Takeda, Yota Kon, Gonzalo Quiroga Artigas, Pascal Lapébie, Carine Barreau, Osamu Koizumi, Takeo Kishimoto, Kazunori Tachibana, Evelyn Houliston, Ryusaku Deguchi
Oocyte meiotic maturation is crucial for sexually reproducing animals, and its core cytoplasmic regulators are highly conserved between species. By contrast, the few known maturation-inducing hormones (MIHs) that act on oocytes to initiate this process are highly variable in their molecular nature. Using the hydrozoan jellyfish species Clytia and Cladonema, which undergo oocyte maturation in response to dark-light and light-dark transitions, respectively, we deduced amidated tetrapeptide sequences from gonad transcriptome data and found that synthetic peptides could induce maturation of isolated oocytes at nanomolar concentrations...
January 22, 2018: Development
https://www.readbyqxmd.com/read/29355519/successful-sperm-cryopreservation-of-the-brown-marbled-grouper-epinephelus-fuscoguttatus-using-propylene-glycol-as-cryoprotectant
#9
Maisarah Yusoff, Mohd Badrul Nizam Hassan, Muhammad Ikhwanuddin, Shahreza Md Sheriff, Fatimah Hashim, Sufian Mustafa, Ivan Chong Chu Koh
This study developed the cryopreservation of brown-marbled grouper spermatozoa for practical application. We examined 32 cryodiluents, developed from four types of cryoprotectants [propylene glycol (PG), dimethyl-sulphoxide (Me2SO), dimethyl-acetamide (DMA) and ethylene glycol (EG)] at four concentrations of 5, 10, 15 and 20% in combination with two extenders [Fetal bovine serum (FBS) and artificial seminal plasma (ASP). Cooling rates were examined by adjusting the height of straws (2.5-12.5 cm) from the liquid nitrogen (LN) vapour and cooled for 5 min before immersion into LN...
January 18, 2018: Cryobiology
https://www.readbyqxmd.com/read/29354302/application-of-stereological-methods-for-unbiased-estimation-of-sperm-morphology-in-the-mice-induced-by-busulfan
#10
Sakineh Panahi, Mohammad-Amin Abdollahifar, Abbas Aliaghaei, Hamid Nazarian, Shahrokh Paktinat, Shabnam Abdi, Reza Mastery Farahani
Busulfan is an anticancer drug, which causes the apoptosis germ cells and azoospermia in humans and animals. Abnormal morphology of spermatozoa related to the male infertility. The sperm morphology is evaluation of sperm size, shape and appearance characteristics should be assessed by carefully observing a stained sperm sample under the microscope. Evaluation of sperm morphology has been considered as one of the most important factors for a successful fertilization and determining sperm quality. The mice were assigned to tow experimental groups: control and busulfan...
December 2017: Anatomy & Cell Biology
https://www.readbyqxmd.com/read/29340252/positive-selection-on-human-gamete-recognition-genes
#11
Michael W Hart, Daryn A Stover, Vanessa Guerra, Sahar V Mozaffari, Carole Ober, Carina F Mugal, Ingemar Kaj
Coevolution of genes that encode interacting proteins expressed on the surfaces of sperm and eggs can lead to variation in reproductive compatibility between mates and reproductive isolation between members of different species. Previous studies in mice and other mammals have focused in particular on evidence for positive or diversifying selection that shapes the evolution of genes that encode sperm-binding proteins expressed in the egg coat or zona pellucida (ZP). By fitting phylogenetic models of codon evolution to data from the 1000 Genomes Project, we identified candidate sites evolving under diversifying selection in the human genes ZP3 and ZP2...
2018: PeerJ
https://www.readbyqxmd.com/read/29339787/cilia-related-protein-spef2-regulates-osteoblast-differentiation
#12
Mari S Lehti, Henna Henriksson, Petri Rummukainen, Fan Wang, Liina Uusitalo-Kylmälä, Riku Kiviranta, Terhi J Heino, Noora Kotaja, Anu Sironen
Sperm flagellar protein 2 (SPEF2) is essential for motile cilia, and lack of SPEF2 function causes male infertility and primary ciliary dyskinesia. Cilia are pointing out from the cell surface and are involved in signal transduction from extracellular matrix, fluid flow and motility. It has been shown that cilia and cilia-related genes play essential role in commitment and differentiation of chondrocytes and osteoblasts during bone formation. Here we show that SPEF2 is expressed in bone and cartilage. The analysis of a Spef2 knockout (KO) mouse model revealed hydrocephalus, growth retardation and death prior to five weeks of age...
January 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29306179/vector-mediated-transmission-of-persistently-transmitted-plant-viruses
#13
REVIEW
Dongsheng Jia, Qian Chen, Qianzhuo Mao, Xiaofeng Zhang, Wei Wu, Hongyan Chen, Xiangzhen Yu, Zhiqiang Wang, Taiyun Wei
Many vector-borne plant viruses of agricultural importance are persistently transmitted from plant to plant by sap-sucking insects. So far, the mechanisms for vector-mediated horizontal transmission of the viruses to plant hosts and for vertical transmission to insect offspring have been poorly understood. During horizontal transmission, intact virions or virus-induced inclusions are exploited by persistently transmitted viruses to overcome the midgut and salivary gland barriers. The existing oocyte entry paths used by vitellogenin or symbiont bacteria can mediate the vertical transmission of viruses by female insects...
January 3, 2018: Current Opinion in Virology
https://www.readbyqxmd.com/read/29304256/dynamics-ultrastructure-and-gene-expression-of-human-in-vitro-organized-testis-cells-from-testicular-sperm-extraction-biopsies
#14
Kathrein von Kopylow, Wolfgang Schulze, Andrea Salzbrunn, Matthias Schaks, Elke Schäfer, Beate Roth, Stefan Schlatt, Andrej-Nikolai Spiess
STUDY QUESTION: Is it possible to induce in-vitro reorganization of primary human testis cells from testicular sperm extraction (TESE) biopsies, maintain their long-term cultivation in a 2D system and identify cellular compositions? SUMMARY ANSWER: In-vitro reorganization of primary human testis cells from TESE biopsies and their long-term cultivation on uncoated cell culture dishes is feasible and the cellular compositions can be uncovered through gene expression and microscopic analyses...
January 3, 2018: Molecular Human Reproduction
https://www.readbyqxmd.com/read/29302007/rapid-genome-shrinkage-in-a-self-fertile-nematode-reveals-sperm-competition-proteins
#15
Da Yin, Erich M Schwarz, Cristel G Thomas, Rebecca L Felde, Ian F Korf, Asher D Cutter, Caitlin M Schartner, Edward J Ralston, Barbara J Meyer, Eric S Haag
To reveal impacts of sexual mode on genome content, we compared chromosome-scale assemblies of the outcrossing nematode Caenorhabditis nigoni to its self-fertile sibling species, C. briggsaeC. nigoni's genome resembles that of outcrossing relatives but encodes 31% more protein-coding genes than C. briggsaeC. nigoni genes lacking C. briggsae orthologs were disproportionately small and male-biased in expression. These include the male secreted short (mss) gene family, which encodes sperm surface glycoproteins conserved only in outcrossing species...
January 5, 2018: Science
https://www.readbyqxmd.com/read/29299289/high-level-of-sperm-competition-may-increase-transfer-of-accessory-gland-products-carried-by-the-love-dart-of-land-snails
#16
Monica Lodi, Alexandra Staikou, Ruben Janssen, Joris M Koene
Postcopulatory adaptations that increase reproductive success compared to rivals, like the transfer of accessory gland products that promote paternity, are common when sperm competition occurs among males. In land snails, the dart shooting behavior and its adaptive significance, in promoting individual fitness through enhanced paternity of the successful dart shooter, have been considered such an adaptation. The fitness result gained is mediated by the transfer of mucus components on the love dart capable of altering the physiology of the receiver's reproductive tract...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29242234/arabidopsis-pollen-tube-integrity-and-sperm-release-are-regulated-by-ralf-mediated-signaling
#17
Zengxiang Ge, Tabata Bergonci, Yuling Zhao, Yanjiao Zou, Shuo Du, Ming-Che Liu, Xingju Luo, Hao Ruan, Liliana E García-Valencia, Sheng Zhong, Saiying Hou, Qingpei Huang, Luhua Lai, Daniel S Moura, Hongya Gu, Juan Dong, Hen-Ming Wu, Thomas Dresselhaus, Junyu Xiao, Alice Y Cheung, Li-Jia Qu
In flowering plants, fertilization requires complex cell-to-cell communication events between the pollen tube and the female reproductive tissues, which are controlled by extracellular signaling molecules interacting with receptors at the pollen tube surface. We found that two such receptors in Arabidopsis, BUPS1 and BUPS2, and their peptide ligands, RALF4 and RALF19, are pollen tube-expressed and are required to maintain pollen tube integrity. BUPS1 and BUPS2 interact with receptors ANXUR1 and ANXUR2 via their ectodomains, and both sets of receptors bind RALF4 and RALF19...
December 22, 2017: Science
https://www.readbyqxmd.com/read/29198215/dietary-l-arginine-supplementation-improves-semen-quality-and-libido-of-boars-under-high-ambient-temperature
#18
J Q Chen, Y S Li, Z J Li, H X Lu, P Q Zhu, C M Li
l-Arginine is a nutritionally essential amino acid for spermatogenesis and plays versatile roles in animal health and can be utilized as a potential agent to improve reproductive performance of boars under high ambient temperature. The present study aimed to determine whether dietary l-arginine could alleviate heat stress-induced infertility in boars. In all, 20 boars (PIC 1040; 248.59±3.84 kg BW and 407.65±6.40 days of age) were selected and randomly assigned to four groups (group 0.0%, basal diet; group 0...
December 4, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29191251/grooves-surrounding-the-micropyle-decrease-the-inseminating-dose-in-fish
#19
Matheus Pereira-Santos, Eduardo Shimoda, André Furugen Cesar de Andrade, Luciano Andrade Silva, Takafumi Fujimoto, José Augusto Senhorini, George Shigueki Yasui, Laura Satiko Okada Nakaghi
In fish with external fertilization, sperm must reach the oocyte through the micropyle to enter the cytoplasm. Fertilization success is then influenced by characteristics of oocytes or sperm. In this study, we evaluated oocyte morphology and sperm motility parameters and their effects on the inseminating dose in a teleost fish Astyanax altiparanae. Interestingly, we found one of the lowest yet described inseminating doses in teleosts (2390 spermatozoa oocyte-1 ml-1). Such a fertilization efficacy may be explained by the long duration of sperm motility (>75 s), the small oocyte diameter (695...
December 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/29159832/expression-and-localisation-of-rxfp3-in-human-spermatozoa-and-impact-of-insl7-on-sperm-functions
#20
S Heidari, A H Taromchi, R Nejatbakhsh, S Shokri
Insulin-like peptide 7 (INSL7) or relaxin-3 is a member of the insulin superfamily that is recently discovered. This hormone interacts with relaxin family peptide receptor 3 (RXFP3). Although recent studies of INSL7 have focused on its function in the brain as a neuropeptide, spermatozoa may be a candidate target of INSL7 due to its detection in testes and contains binding sites. Therefore, this study aims to analyse the expression and localisation of RXFP3 on human spermatozoa and to assess the effect of INSL7 on human sperm motility...
November 21, 2017: Andrologia
keyword
keyword
94658
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"