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You are here: Home / NEWS . . . . . . . . / Vaccine Adverse Events / Vaccine Associated Disorders / Autism / Autism, hormonal metabolism and calcium signalling

Autism, hormonal metabolism and calcium signalling

April 25, 2011 By Jonathan 3 Comments

Autism Calcium Channelopathy

Abnormalities in hormonal metabolism are frequently observed in individuals with autism, with several studies observing abnormal levels of many hormones and their receptors compared to healthy controls, as well as abnormal hormonal secretion rhythms [2713159, 1904373, 12959423, 10808042].

For example the analysis of the Hypothalamic-Pituitary-Adrenocortical (HPA) system responses observed more variable circadian rhythm as well as significant elevations in cortisol following exposure to a novel stimulus in children with autism compared to controls. This exaggerated cortisol response is indicative of dysfunction of the HPA system in autism [16005570]. Over-reaction of the endocrine system to insulin stress in autism has been recorded in another study, whereas the experimental stress of insulin-induced hypoglycemia showed slower recovery of blood glucose, much faster cortisol response and elevation of growth hormone levels compared to controls [1176974, 2870051]. Low levels of insulin-like growth factor-I (IGF-I) in cerebrospinal fluid have also been observed [16904022].

Metabolic disorders of serotonin and dopamine systems have been suggested in autism, with aproximately thirty percent of individuals with autism exibiting high levels of serotonin, simultanous with lowered levels of melatonin (see Neurotransmitters). Melatonin is converted from serotonin by several enzymes of the pinealocytes in the pineal gland, including 5-HT N-acetyl transferase and 5-hydroxyindole-O-methyltransferase. Results of the studies looking at sleep disturbances in autism suggest that both dyssomnias and parasomnias are very prevalent in the disorders – people with autism frequently experience sleep disorders and exhibit atypical sleep architecture [10722958, 15705609, 17001527]. Further evidence of dysfunction of pineal endocrine system in autism was obtained by looking at alterations of the light and dark circadian rhythm of melatonin, where none of autistic patient showed a normal melatonin circadian rhythm, together with once again significantly lower levels of this hormone [11455326].

Leptin is a hormone linked to melatonin that plays an important role in amongst other things regulation of appetite and metabolism. Results from a recent study have demonstrated significant differences in leptin concentrations between children with autism and controls [17347881].

Calcium influx through voltage gated calcium channels is directly involved in both neurotransmitter and hormone secretion. In newborn mice the relative dominance of LTCC over other types of calcium channels has been observed [14724188]. LTCC are present on different pituitary cells and their activity is in part modulated by sex steroids [2461851] (see also Gender Differences). Hormonal secretion evoked by various agents is mediated via calcium influx through LTCC [9514161, 15500542, 8677013, 1649931].

Calcium signalling plays a central role in regulation of melatonin biosynthesis, mostly through activities related to phosphorylation of the transcription factor CREB [9618900] (see Brain for details on LTCC-CREB). Changes in conductance of LTCC and intracellular calcium oscillations have dramatic effects on melatonin levels [10820209] (see also Neurotransmitters– serotonin).

Calcium signalling though LTCC plays an important role in the release of insulin and regulation of the expression of its gene (via CREB mediated transcription). Significantly increased amounts of calcium in the cells cause release of previously synthesised insulin, stored in secretory vesicles (see Gastrointestinal). Of possible relevance is the observation that both low and elevated or sustained levels of intracellular calcium impair insulin-stimulated glucose uptake [2551647, 3312189].

 

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Filed Under: Autism, Endocrine System, Nervous System, Thyroid Tagged With: autism, Autoimmune Diseases

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