Course of proteolytic cleavage in three classes of yolk proteins during oocyte maturation in barfin flounderVerasper moseri, a marine teleost spawning pelagic eggs

1997 ◽  
Vol 278 (3) ◽  
pp. 189-200 ◽  
Author(s):  
Takahiro Matsubara ◽  
Yasunori Koya
Keyword(s):  
Oocyte Maturation ◽  
Proteolytic Cleavage ◽  
Marine Teleost ◽  
Yolk Proteins ◽  
Pelagic Eggs

scholarly journals Derivation of Major Yolk Proteins from Parental Vitellogenins and Alternative Processing During Oocyte Maturation in Fundulus heteroclitus1

2005 ◽  
Vol 73 (4) ◽  
pp. 815-824 ◽  
Author(s):  
Gary J. LaFleur ◽  
Demetrio Raldúa ◽  
Mercedes Fabra ◽  
Oliana Carnevali ◽  
Nancy Denslow ◽  
...  
Keyword(s):  
Oocyte Maturation ◽  
Yolk Proteins ◽  
Alternative Processing

CONJUGATES OF OVARIAN STEROIDS, INCLUDING 17α, 20β-DIHYDROXY-4-PREGNEN-3-ONE (MATURATION-INDUCING STEROID), ACCUMULATE IN THE URINE OF A MARINE TELEOST (PLAICE; PLEURONECTES PLATESSA)

1989 ◽  
Vol 123 (1) ◽  
pp. R1-R4 ◽  
Author(s):  
Adelino V. M. Canario ◽  
A. P. Scott
Keyword(s):  
Oocyte Maturation ◽  
Stage Iv ◽  
Plasma Samples ◽  
Marine Teleost ◽  
Ovarian Steroids ◽  
Pleuronectes Platessa ◽  
Final Oocyte Maturation ◽  
Plasma And Urine Samples ◽  
Ovarian Maturity ◽  
Conjugated Steroids

ABSTRACT Free and conjugated 17α, 20β-dihydroxy-4-pregnen-3-one (17, 20β-P), 17α, 21-dihydroxy-4-pregnene-3, 20-dione (11-deoxycortisol) and 3α, 17α, 21-trihydroxy-5β-pregnan-20-one (3α, 17, 21-P-5β) were measured by radioimmunoassay in matching blood plasma and urine samples from plaice (Pleuronectes platessa) females at several ovarian maturity stages: post-vitellogenesis (IV), final oocyte maturation (V), and ovulation (VI). Free steroids were generally low in all samples. Conjugated steroids were up to 2 orders of magnitude higher in urine than in plasma samples. Conjugated 17, 20β-P was higher in stage V than in stage IV or VI females. Conjugated 11-deoxycortisol was higher in stage IV and V females. Conjugated 3α, 17, 21-P-5β was higher in stage V and VI females. These results support earlier studies which indicated that 17, 20β-P was the most likely maturation-inducing steroid (MIS) in plaice, and that the urine might be a vehicle for steroid pheromones synthesized by the gonads.

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