Abstract:
:The changes in the intracellular pH (pHi) of sea urchin sperm associated with motility initiation and acrosome reaction were investigated using uptake of two different probes; 9-aminoacridine and methylamine, as a qualitative index. Sperm suspended in Na+-free sea water were immotile and able to concentrate these amines 20-fold or greater indicating that pHi is more acidic than the external medium (pHo = 7.7). This uptake ratio was essentially constant over a wide range of probe and sperm concentrations. Discharge of the pH gradient with specific ionophores (nigericin, monensin, and tetrachlorosalicylanilide) or nonspecifically using low concentration of detergents (Triton X-100 and lysolecithin) all resulted in the release of the probes indicating they are indeed sensing the pH gradient across the sperm membrane. Addition of Na+ to sperm suspended in Na+-free sea water resulted in activation of motility with concomitant efflux of the probes indicating the alkalinization of pHi by 0.4-0.5 pH units. That this pHi change is the causal trigger of motility was suggested by experiments using NH4Cl and nigericin, which increased the pHi and resulted in activation of motility in the absence of Na+. When sperm were directly diluted into artificial sea water (motility activated), a slow reacidification of pHi was observed in one species of sea urchin (L. pictus) but not in the other (S. purpuratus). This acidification could be blocked by mitochondrial inhibitors, verapamil, or the removal of external calcium suggesting that the increase in metabolic activity stimulated by the influx of Ca2+ is responsible for the reacidification. Induction of acrosome reaction further alkalinized the pHi by about 0.16 pH units and was also followed by prolonged reacidification which correlated with the observed increase in Ca2+ uptake. Either mitochondrial agents or the removal of external Ca2+ could also block this pHi change suggesting a similar mechanism is involved.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Lee HC,Johnson C,Epel Ddoi
10.1016/0012-1606(83)90004-0subject
Has Abstractpub_date
1983-01-01 00:00:00pages
31-45issue
1eissn
0012-1606issn
1095-564Xpii
0012-1606(83)90004-0journal_volume
95pub_type
杂志文章abstract::Although round spermatid injection can be used to create progeny for males who do not produce mature sperm, the rate of successful embryogenesis after such procedures is significantly lower than that for similar procedures using mature spermatozoa. The mechanisms underlying this difference are unknown. In this study, ...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2005.10.026
更新日期:2006-01-01 00:00:00
abstract::The murine allantois will become the umbilical artery and vein of the chorioallantoic placenta. In previous studies, growth and differentiation of the allantois had been elucidated in whole embryos. In this study, the extent to which explanted allantoises grow and differentiate outside of the conceptus was investigate...
journal_title:Developmental biology
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1006/dbio.1997.8704
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journal_title:Developmental biology
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2008.07.035
更新日期:2008-10-15 00:00:00
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(83)90066-0
更新日期:1983-05-01 00:00:00
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2007.11.014
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journal_title:Developmental biology
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journal_title:Developmental biology
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journal_title:Developmental biology
pub_type: 杂志文章,评审
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更新日期:2017-12-01 00:00:00
abstract::Cadherin-11 (cad-11) is a novel member of the cadherin family of cell adhesion molecules, having recently been identified by means of the polymerase chain reaction. To study the function and expression of this molecule, we cloned mouse, cad-11 cDNA. Transfection of L cells with cDNA led them to acquire a typical cadhe...
journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1006/dbio.1995.1149
更新日期:1995-05-01 00:00:00
abstract::Extensive elongation of lens fiber cells is a central feature of lens morphogenesis. Our study investigates the role of N-cadherin junctions in this process in vivo. We investigate both the molecular players involved in N-cadherin junctional maturation and the subsequent function of these junctions as epicenters for t...
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abstract::Malfunctions of motile cilia cause a variety of developmental defects and diseases in humans and animal model organisms. Defects include impaired mucociliary clearance of the airways, sperm immotility, hydrocephalus and organ laterality. Here, we characterize the evolutionary conserved Cfap43 gene by loss-of-function ...
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(83)90321-4
更新日期:1983-03-01 00:00:00
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/0012-1606(86)90241-1
更新日期:1986-05-01 00:00:00
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journal_title:Developmental biology
pub_type: 杂志文章
doi:10.1016/j.ydbio.2006.02.007
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abstract::The Ci-Dll-B gene is an early regulator of ectodermal development in the ascidian Ciona intestinalis (Imai et al., 2006). Ci-Dll-B is located in a convergently transcribed bigene cluster with a tandem duplicate, Ci-Dll-A. This clustered genomic arrangement is the same as those of the homologous vertebrate Dlx genes, w...
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Developmental biology
pub_type: 杂志文章
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journal_title:Developmental biology
pub_type: 杂志文章
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journal_title:Developmental biology
pub_type: 杂志文章
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