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Prolactin responses to thyrotropin-releasing hromone in protein-calorie malnutrition
Insights
Children with protein-calorie malnutrition (PCM) show low basal plasma prolactin (hPRL) but normal TRH response. Treatment normalizes hPRL levels, unlike TSH responses in untreated PCM.
Area of Science:
- Pediatric Endocrinology
- Nutritional Science
- Hormone Regulation
Background:
- Protein-calorie malnutrition (PCM) significantly impacts endocrine function in children.
- Thyrotropin-releasing hormone (TRH) plays a crucial role in regulating pituitary hormones, including prolactin (hPRL) and thyroid-stimulating hormone (TSH).
- Altered hormonal profiles are characteristic of malnutrition, but specific responses to stimuli require elucidation.
Purpose of the Study:
- To investigate basal and TRH-stimulated plasma prolactin (hPRL) levels in children with PCM before and after nutritional rehabilitation.
- To compare the endocrine responses of hPRL and TSH to TRH provocation in children with PCM.
- To understand the divergence in hPRL and TSH responses to TRH in the context of PCM.
Main Methods:
- Measurement of basal plasma hPRL concentrations in children with PCM.
- Assessment of hPRL and TSH responses to TRH administration in the same cohort.
- Comparison of pre-treatment and post-treatment endocrine profiles.
Main Results:
- Children with PCM exhibited low basal hPRL levels but a normal response to TRH before treatment.
- Nutritional treatment led to increased basal hPRL concentrations and an augmented TRH response.
- These findings contrasted with the typically normal or high basal TSH and normal to exaggerated TSH response to TRH in untreated PCM.
Conclusions:
- Nutritional rehabilitation normalizes prolactin secretion patterns in response to TRH in children with PCM.
- The distinct responses of prolactin and TSH to TRH in PCM suggest complex regulatory mechanisms.
- Further research is needed to clarify the obscure reasons behind the divergent endocrine responses observed in PCM.
Abstract:
Basal plasma prolactin (hPRL) concentration is low, but the response to thyrotropin-releasing hormone (TRH) is within the normal range, in children with protein-carlorie malnutrition (PCM) before treatment. Treatment results in increased basal hPRL concentration and an increased response to TRH. The above findings contrast with normal or high basal TSH and the normal or exaggerated response to TRH provocation in untreated PCM. The reason for this divergence is obscure.