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      Prolactin Response to Formalin Is Related to the Acute Nociceptive Response and It Is Attenuated by Combined Application of Different Stressors

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          Subcutaneous injection of diluted formalin (0.2 ml of 4% solution/100 g BW) can influence the increase of plasma epinephrine levels in rats exposed to exteroceptive (handling, immobilization), as well as to interoceptive stressors (insulin-induced hypoglycemia), without having any effect on norepinephrine release. In the present studies, the effect of the above-mentioned stressors has been investigated on formalin-induced prolactin (PRL) and corticosterone secretion. Administrations of formalin via chronically implanted subcutaneous cannula into the hind limb without handling induce an immediate increase in both plasma PRL and corticosterone levels. While PRL concentration reaches its peak value within 5 min then returns to the basal level by the end of the 30th min, corticosterone level also starts to rise immediately after formalin administration reaching its highest concentration within 15–30 min, but it remains at this high level during the next 60 min, then it declines and returns to the pre-injection level. Application of formalin to animals exposed to different heterotypic stressors (like handling or insulin-induced hypoglycemia) produces an attenuated PRL response, while plasma corticosterone levels induced by the same nociceptive component remained unchanged. Combinations of formalin injection with immobilization also show an attenuated PRL response. The present data indicate that plasma PRL response to formalin is related to its acute nociceptive phase, and application of different stressors prior to formalin injection significantly attenuate plasma PRL levels, while it does not influence corticosterone responses.

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          Most cited references 27

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          The formalin test: A quantitative study of the analgesic effects of morphine, meperidine, and brain stem stimulation in rats and cats

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            Stressor Specificity of Central Neuroendocrine Responses: Implications for Stress-Related Disorders

             K Pacak (2001)
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              The formalin test: scoring properties of the first and second phases of the pain response in rats


                Author and article information

                S. Karger AG
                September 2007
                08 June 2007
                : 86
                : 2
                : 69-76
                aInstitute of Experimental Endocrinology, Slovak Academy of Sciences, and bInstitute of Pathophysiology, Faculty of Medicine, Comenius University, Bratislava, Slovakia; cNeuromorphological and Neuroendocrine Laboratory, Department of Human Morphology, and dNeuromorphological and Neuroendocrine Laboratory, Department of Anatomy, Hungarian Academy of Sciences and Semmelweis University, Budapest, Hungary
                103750 Neuroendocrinology 2007;86:69–76
                © 2007 S. Karger AG, Basel

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                Page count
                Figures: 5, References: 36, Pages: 8
                TRH and Prolactin


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