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Ceramide induces a multicomponent intracellular calcium increase triggering the acrosome secretion in human sperm
(Elsevier Science, 2020-07)
Exocytosis of spermatozoon's secretory vesicle, named acrosome reaction (AR), is a regulated event that plays a central role in fertilization. It is coupled to a complex calcium signaling. Ceramide is a multitasking lipid ...
Nectar secretion of floral buds of Tococa guianensis mediates interactions with generalist ants that reduce florivory
(Frontiers Media S.A., 2020-05-21)
The specialised mutualism between Tococa guianensis and ants housed in its leaf domatia is a well-known example of myrmecophily. A pollination study on this species revealed that flowers in the bud stage exude a sugary ...
GABAergic signaling in the rat pineal gland
(Wiley Blackwell Publishing, Inc, 2016-08)
Pinealocytes secrete melatonin at night in response to norepinephrine released from sympathetic nerve terminals in the pineal gland. The gland also contains many other neurotransmitters whose cellular disposition, activity, ...
Human sperm chemotaxis: Both the oocyte and its surrounding cumulus cells secrete sperm chemoattractants
(Oxford University Press, 2005-03)
Background: Human sperm chemotaxis to pre-ovulatory follicular fluid is well established in vitro. However, it is not known whether the female's oocyte-cumulus complex secretes sperm chemoattractants subsequent to ovulation ...
Lack of nitric oxide-mediated regulation of amylase secretion stimulated by VIP in parotid glands of NOD mice
(Elsevier Science, 2004-12)
The non-obese diabetic (NOD) mouse is chosen among other experimental models to study autoimmune sialadenitis resembling Sjögren's syndrome (SS), because of its unique characteristic of developing salivary dysfunction. ...
Ghrelin directly stimulates glucagon secretion from pancreatic α-cells
(Oxford University Press, 2011-09)
Previous work has demonstrated that the peptide hormone ghrelin raises blood glucose. Such has been attributed to ghrelin's ability to enhance GH secretion, restrict insulin release, and/or reduce insulin sensitivity. ...
Morphological diversity in the parotoid macroglands of neotropical true toads (Anura: Bufonidae) and its association with the release of glandular secretion
(Elsevier Gmbh, 2021-09)
The parotoid macrogland in toads of the family Bufonidae is a complex structure mainly related to a defensive function. It presents considerable variability among species regarding their morphology, chemical nature of the ...
The Chlamydia trachomatis Type III Secretion Chaperone Slc1 Engages Multiple Early Effectors, Including TepP, a Tyrosine-phosphorylated Protein Required for the Recruitment of CrkI-II to Nascent Inclusions and Innate Immune Signaling
(Public Library of Science, 2014-03)
Chlamydia trachomatis, the causative agent of trachoma and sexually transmitted infections, employs a type III secretion (T3S) system to deliver effector proteins into host epithelial cells to establish a replicative ...
An inhibitory mechanism of action of coiled-coil peptides against type three secretion system from enteropathogenic Escherichia coli
(John Wiley & Sons Ltd, 2019-03)
Human pathogenic gram-negative bacteria, such as enteropathogenic Escherichia coli (EPEC), rely on type III secretion systems (T3SS) to translocate virulence factors directly into host cells. The coiled-coil domains present ...
Divergent strategies of nectar secretion in two bat-pollinated Passiflora species
(Elsevier Gmbh, 2022)