Kininogen present in rat reproductive tissues is apparently synthesized by the liver, not by the reproductive system.
OBJECTIVE
The purpose of this study was to determine the source(s) of the reproductive tract kininogen and to assess whether kininogen transcription is influenced by reproductive conditions.


METHODS
Rats in various reproductive states (immature, mature, ovulatory, luteal phase, pregnancy, parturition, postpartum) were used to obtain reproductive tissues (follicles, corpora lutea, oviduct, uterus, testes) and liver. Complementary deoxyribonucleic acid probes for rat prekininogens were used to quantify kininogen messenger ribonucleic acid synthesis.


RESULTS
The T-prekininogen complementary deoxyribonucleic acid probe detected a single 1.6 kb message, whereas the k-prekininogen complementary deoxyribonucleic acid probe identified two messages, an abundantly expressed 1.6 kb band and a 2.2 kb band. The source of all the three prekininogen messages appears to be the liver. Naturally occurring reproductive conditions such as ovulation, implantation, and parturition, did not turn on prekininogen message transcription in the rat gonad or genital tract. Only decidualization of the uterus was associated with the induction of kininogen transcription in the liver.


CONCLUSIONS
There appears to be little, if any, contribution of local gene expression to the kininogen present in the reproductive tissues. Apparently, the reproductive tract increases uptake of kininogen from plasma as needed.
Hossain
A M
AM
Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta 30912, USA.
Whitman
G F
GF
Khan
I
I
D000818:Animals; D003338:Corpus Luteum / Q000378:metabolism; D015342:DNA Probes; D003656:Decidua / Q000502:physiology; D010064:Embryo Implantation; D005187:Fallopian Tubes / Q000378:metabolism; D005260:Female; D005835:Genitalia / Q000378:metabolism*; D007704:Kininogens / Q000032:analysis / Q000096:biosynthesis* / Q000235:genetics; D007705:Kinins; D008099:Liver / Q000378:metabolism*; D008297:Male; D006080:Ovarian Follicle / Q000378:metabolism; D010060:Ovulation; D011247:Pregnancy; D011498:Protein Precursors / Q000235:genetics; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013737:Testis / Q000378:metabolism; D014599:Uterus / Q000378:metabolism
D015342:DNA Probes; D007704:Kininogens; D007705:Kinins; D011498:Protein Precursors; D012333:RNA, Messenger; C046022:prekininogens