Stressors, Including Social Conflict, Decrease Plasma Prolactin in Male Golden Hamsters

Effects of Chronic Social Stress on Neuroendocrine Responsiveness to Challenge with Ethanol, Dexamethasone and Corticotropin-Releasing Hormone

“…Dijkstra et al [22 ]reported elevated plasma hormone concentration in subdominant rats 20 min after exposure to an intruder rat, with no change in dominant rats. Conversely, male subordinate hamsters had lower plasma PRL concentration after an aggressive interaction with a dominant hamster [48]. The present findings of high baseline PRL concentrations in dominant triad-housed rats may support the positive correlation between baseline plasma concentrations of PRL, testosterone, and the level of dominance and aggression in men [49].…”

Social defeat and subordination as models of social stress in laboratory rodents: A review

“…Defeated and subordinate males exhibit significant increases in plasma β-endorphine and β-lipotropin Huhman et al, 1990Huhman et al, , 1991. Prolactin decreases after a single defeat and repeated defeats [Huhman et al, 1995], although an increase has also been reported . In addition, continuous stress increases vasopressin in the external zone of the median eminence [De Goeij et al, 1992].…”

“…In this respect, comparisons have already been carried out with other types of stressors in different variables: (a) with the stress of novelty in CRF, vasopressin (AVP), oxytocin, corticosterone, and cortisol changes [Haemisch, 1990;Romero et al, 1995]; anxiety [Rodgers and Cole, 1993]; grooming [Van Erp et al, 1994]; and immunological response [Azpiroz et al, 1994]; (b) with the stress of taking blood samples in hormonal responses [Sachser, 1987]; (c) with footshock stress in some indices of humoral and cellular immunity ; prolactin [Huhman et al, 1995]; preference for odors [Williams and Groux, 1993]; grooming [Van Erp et al, 1994]; and ultrasounds [van der Poel and Miczek, 1991]; (d) with the stress of surgery in circadian amplitude of heart rate and temperature [Harper et al, 1996]; (e) with restraint stress in ACTH, cardiovascular response, and the effect of anxiolytics on the behavior in the elevated plus-maze test [Heinrichs et al, 1994;see Sgoifo et al, this issue]; (f) with forced swimming in ACTH, and the effect of anxiolytics on the behavior in the elevated plus-maze test [Heinrichs et al, 1994]; and (g) with shock-prod in NE, E, and corticosterone [Sgoifo et al, 1996]. It has been found that some of the changes induced by social stress are different than those induced by other stressors, but similarities are evident in other cases.…”

From Galactorrhea to Osteopenia: Rethinking Serotonin–Prolactin Interactions

“…Various forms of stress are associated with increased PRL release, including ether stress (Johnston and Negro-Vilar, 1986), restraint stress (Torner et al, 2001;Gala, 1990;Neill, 1970;Rossier et al, 1980;Seggie and Brown, 1975) thermal stress (Vaha-Eskeli et al, 1991), social conflict in mice (Huhman et al, 1995), and academic stress in humans (Malarkey et al, 1991). PRL circadian rhythm disturbances occur in patients with premenstrual dysphoric disorder, which may be linked to chronobiologic abnormalities in this condition (Parry et al, 1996).…”