Unaltered innervation of the human cervix uteri in contrast to the corpus during pregnancy and labor as revealed by PGP 9.5 immunohistochemistry.
OBJECTIVE
To examine the occurrence of the general neuronal marker protein gene product 9.5 (PGP 9.5) in the human corpus (isthmus region) and the cervix uteri during pregnancy and parturition


METHODS
Biopsies were taken from the upper edge of the hysterotomy during caesarean section (CS) at term (n=5), in labor (n=5) and from the corresponding area in the non-pregnant uterus after hysterectomy (n=5). Cervical biopsies were obtained transvaginally from the anterior cervical lip. Serial cryostate sections were prepared for immunohistochemistry using polyclonal antibodies to PGP 9.5.


RESULTS
Nerve fibers displaying PGP 9.5 immunoreactivity were observed in all sections from the three groups examined. They were identified in muscle tissue, in the stroma, and around blood vessel walls. A 30-fold decline of immunoreactive nerve fibers was observed in the isthmus part of the corpus uteri at term compared to the non-pregnant. There were no significant differences between the immunoreactivity in the cervix uteri of the three groups


CONCLUSIONS
The innervation of the cervix uteri is dense and unaltered throughout pregnancy and labor. In contrast, the corpus is almost denervated. Further studies are needed to clarify the reason and the impact of these findings.
Tingåker
Berith K
BK
Karolinska Institute, Department of Woman and Child Health, Division of Obstetrics and Gynecology, Karolinska Hospital, SE-171 76 Stockholm, Sweden. Berith.Tingaker@kbh.ki.se
Johansson
Olle
O
Cluff
Ann Hjelm
AH
Ekman-Ordeberg
Gunvor
G
D000328:Adult; D001706:Biopsy; D002584:Cervix Uteri / Q000098:blood supply / Q000294:innervation*; D002585:Cesarean Section; D005260:Female; D006801:Humans; D007044:Hysterectomy; D020883:Hysterotomy; D007150:Immunohistochemistry; D048949:Labor Pain / Q000503:physiopathology; D007743:Labor, Obstetric / Q000502:physiology; D011247:Pregnancy; D043222:Ubiquitin Thiolesterase / Q000032:analysis*; D014599:Uterus / Q000098:blood supply / Q000294:innervation*
C482860:UCHL1 protein, human; D043222:Ubiquitin Thiolesterase