Document Detail


The effect of lead intoxication on endocrine functions.
MedLine Citation:
PMID:  19411819     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Studies on the effects of lead on the endocrine system are mainly based on occupationally lead-exposed workers and experimental animal models. Although evidence is conflicting, it has been reported that accumulation of lead affects the majority of the endocrine glands. In particular, it appears to have an effect on the hypothalamic-pituitary axis causing blunted TSH, GH, and FSH/LH responses to TRH, GHRH, and GnRH stimulation, respectively. Suppressed GH release has been reported, probably caused by reduced synthesis of GHRH, inhibition of GHRH release or reduced somatotrope responsiveness. Higher levels of PRL in lead intoxication have been reported. In short-term lead-exposed individuals, high LH and FSH levels are usually associated to normal testosterone concentrations, whereas in long-term exposed individuals' low testosterone levels do not induce high LH and FSH concentrations. These findings suggest that lead initially causes some subclinical testicular damage, followed by hypothalamic or pituitary disturbance when longer periods of exposure take place. Similarly, lead accumulates in granulosa cells of the ovary, causing delays in growth and pubertal development and reduced fertility in females. In the parenchyma of adrenals histological and cytological changes are demonstrated, causing changes in plasma basal and stress-mediated corticosterone concentrations and reduced cytosolic and nuclear glucocorticoid receptor binding. Thyroid hormone kinetics are also affected. Central defect of the thyroid axis or an alteration in T4 metabolism or binding to proteins may be involved in derangements in thyroid hormone action. Lead toxicity involves alterations on calcitropic hormones' homeostasis, which increase the risk of skeletal disorders.
Authors:
K K Doumouchtsis; S K Doumouchtsis; E K Doumouchtsis; D N Perrea
Related Documents :
7734029 - Growth hormone secretion after the administration of ghrp-6 or ghrh combined with ghrp-...
15952409 - Short-term modification of sex hormones is associated with changes in ghrelin circulati...
24773629 - Central precocious puberty in a 3 year-old girl with phenylketonuria: a rare association?
3097059 - Effect of oral glucose administration on plasma growth hormone-releasing hormone (ghrh)...
3117449 - Reduced growth hormone response to growth hormone-releasing hormone in children with si...
20044509 - The intestinal lymph fistula model--a novel approach to study ghrelin secretion.
7471739 - The interaction of phenobarbital and other anticonvulsants with oral contraceptive ster...
16567469 - Comparison of renal function markers in kuwaiti patients with sickle cell disease.
3279409 - Plasma levels of hydroxy-flutamide in patients with prostatic cancer receiving the comb...
Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Journal of endocrinological investigation     Volume:  32     ISSN:  1720-8386     ISO Abbreviation:  J. Endocrinol. Invest.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-05-04     Completed Date:  2009-07-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7806594     Medline TA:  J Endocrinol Invest     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  175-83     Citation Subset:  IM    
Affiliation:
Department of General Medicine and Endocrinology, St George's Hospital, University of London, London, UK. konsdoum@yahoo.gr
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Bone and Bones / drug effects,  metabolism*
Endocrine System / drug effects*,  physiology*
Female
Follicle Stimulating Hormone / metabolism
Humans
Hypothalamo-Hypophyseal System / drug effects,  physiopathology
Lead Poisoning / physiopathology*
Luteinizing Hormone / metabolism
Male
Menopause
Occupational Exposure / adverse effects
Reproduction / drug effects
Thyroid Hormones / metabolism
Chemical
Reg. No./Substance:
0/Thyroid Hormones; 9002-67-9/Luteinizing Hormone; 9002-68-0/Follicle Stimulating Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Blood coagulation and fibrinolysis in patients with Cushing's syndrome: Increased plasminogen activa...
Next Document:  In search of an "autophagomometer".