ABSTRACT
There are evidences for modulation of immune function by the sympathetic nervous system and its principal neurotransmitter norepinephrine (NE) throgugh superior ovarian nerve (SON)-coeliac ganglionnoradrenergic postganglionic innervation of the spleen. Seven days after SON transection at 53 days of age, the rat splenocytes were isolated and then cultured for 48h. These culture media, used to simulate ovaries from 60-day- old intact rats (neither SON-transected nor sham-operated) at diestrus 2 stage, in in vitro incubations, showed adecrease in progesterone release, an increase in estradiol release and no change in androstenedione release in relation to splenocyte culture media from control (sham-operated) rats.When esplenocytes from SON transected (SON-t) rats were treated with vasoactive intestinal peptide (VIP) or neuropeptide Y (NPY), both at 16-6M for 24h, their secretions increased the progesterone release while decreasing the estradiol release from the intact ovaries, compared with the secretions of untreated splenocytes from SON-t rats. Although the secretions of splenocytes treated with VIP decrease the androstenedione release from de ovaries, the treatment with NPY produced no change in hormone release. In the present paper the ovarian steroidogenic response, which was modified by the effects of an in vivo SON transection on spleen cells, was reverted by an in vitro system in which the splenocytes were treated with VIP or NPY. This could indicate that the spleen of SON-t rats does not receive those neuropeptides by neural route however, when they are added to splenocyte culture in vitro, the cell secretions revert the profile of steroid hormones released from the intact ovary. We also present functional evidence for modulation of the immune function by sympathetic nervous system and neurotransmitters other than NE.
Subject(s)
Animals , Female , Rats , Cells/metabolism , Neuropeptides/pharmacology , Ovary/metabolism , Spleen/cytology , Steroids/metabolism , Cells/drug effects , Neuropeptide Y/pharmacology , Ovary/innervation , Rats, Sprague-Dawley , Sympathetic Nervous System/injuries , Vasoactive Intestinal Peptide/pharmacologyABSTRACT
El presente trabajo aporta evidencias que indican que factores producidos por la pars tuberalls (PT) afectan la liberación de prolactina desde la pars distalis (PD). Para determinar el efecto de las secreciones al medio de cultivo de células de la PT bovina sobre células dispersas de PD de rata, se trabajó con estas últimas tanto en incubaciones de 30 minutos, como en superfusiones continuas en columnas. Cuando se utilizó medio de cultivo de la totalidad de las células de la PT, se requirieron 9 mug de proteína total para la máxima estimulación de la liberación de prolactina. En cambio, cuando se empleó el correspondiente a las fracciones del 50-60 por ciento de un gradiente de Percoll, sólo se requirieron 4 mug de proteína total. Con una purificación parical en Sephadex G 50 de ese medio, se logró el mismo efecto com 80 ng de proteína total. El principio activo tendría un tamaño molecular superior a los 40 kDal. Los resultados obtenidos permiten proponer, al menos para las células prolactotropas, a la PD como el órgano efector de algunas secreciones de la PT.