Background:
The present study aimed at determining pericytes, a missing component
in the previously proposed living neurovascular unit (NVU) of the sexually dimorphic nucleus of
the preoptic area (SDN-POA) in rats.
Materials and Mehods:
Calbindin D28K-immunoreactivities (CB28-irs) were used to delineate
the SDN-POA in which CD13-immunoreactivities (CD13-irs) or alpha-smooth muscle actinimmunoreactivities
(αSMA-irs), two pericyte biomarkers serving the indexes of pericytes, were
tagged using two adjacent brain sections (90-micron intervals). In addition, the nestinimmunoreactive
(nestin-ir) cells in the SDN-POA were counted as pericytes referring to additional
standards: location and nucleic and cellular morphology. Male SDN-POA volume (5.0±0.3x10-3
mm3) was significantly larger than the female (1.7±0.3x10-3 mm3). Within the SDN-POA, the
CD13-irs were characterized as dots, densely packed and net-like in distribution, while the αSMAirs,
excluding pipe-like or circular structures, appeared as short rod-like structures that were
sparsely distributed.
Results:
The immunoreactive counts of alpha-smooth muscle actin were 353±57/mm2 in males
and 124±46/mm2 in females (p<0.05). On the other hand, densities of the dot-like CD13-irs were
similar between males (4009±301/mm2) and females (4018±414/ mm2). There was no difference
between the male and the female in the nestin-ir pericyte count in the SDN-POA.
Conclusion:
In conclusion, the present study adds new information concerning pericytes to the living
NVU of the SDN-POA. There is a difference of sex in the count of the αSMA-irs in the living
NVU of the SDN-POA. However, why such a difference exists warrants further investigations.
Estrogen Receptor α Gene Promoter 0/B Usage in the Rat Sexually Dimorphic Nucleus of the Preoptic Area
