Endocrine Abstracts

IntroductionIncreased cross talk between the IGF-I and oestrogen signalling pathways has been implicated in the development of tamoxifen resistance in breast cancers. We have previously demonstrated IGF-I mRNA to be down-regulated in primary breast cancers. However, the expression of IGF-I and IGFBP-3 in recurrent, tamoxifen-resistant tumours is unknown.MethodsTotal RNA was extracted from 38 paired samples of primary breast cancers (T) and adjacent normal (N) tissue and from 1...

BackgroundIn addition to inhibiting pituitary GH secretion, somatostatin (SS) and its analogues have been shown to exert anti-proliferative effects on a variety of different cell types. The presence of receptors for SS have been demonstrated in a number of tissues but quantification of mRNA expression of the 5 subtypes of SSTR in the colon is unknown.MethodsTotal RNA was extracted from 9 paired samples of adj...

A 54-year-old man with long standing coeliac disease and moderate dietary compliance was admitted with lethargy and feeling unwell. His blood pressure was 129 mmHg systolic, 91mmHg diastolic and serum sodium 112 millimoles per litre (RR 136 to 145). He was otherwise well with normal visual fields. A 250-microgram Synacthen test demonstrated a basal cortisol of 630 nanomoles per litre rising to 983 nanomoles per litre after 30 minutes. His TSH was undetectable, Ft4 9.6 picomole...

Background. Adrenal insufficiency requires life long corticosteroid therapy, but optimal dosing of hydrocortisone replacement has not received adequate attention.Chronic over or under treatment predisposes to morbidity and mortality.Objective.To examine the variables determiming hydrocortisone disposition and develop practical protocols for individualised prescribing and monitoring of treatment.Design. Prospective open study.<p...

A 77 year old man developed a severe progressive polyneuropathy associated with significant disability. He was also found to have type 2 diabetes mellitus and antibody-negative primary hypothyroidism and was treated with gliclazide and thyroxine to good effect. Nerve conduction studies showed a demyelinating type neuropathy that was not typical of diabetic neuropathy. Two years later he was admitted with an episode of severe hypoglycaemia accompanied by low blood pressure, hyp...

Background: Vitamin D prevents proliferation, promotes differentiation and induces apoptosis of colonic cells. A reduced dietary intake is associated with an increased risk of colorectal cancer (CRC). Recently, we have shown that 25-hydroxyvitamin D-1-alpha hydroxylase (1aOHase) mRNA, which converts vitamin D to its active metabolite, is upregulated in CRC. However, this was based on small number of samples and data on vitamin D receptor (VDR) expression in CRC are inconsisten...

Background: Sporadic colorectal carcinoma (CRC) is more common on the left side of the colon. Acromegaly confers an increased risk of developing CRC but with an increase of right sided disease. IGFBP-3 both regulates tissue exposure to IGF-I and also exerts cellular IGF-l independent pro-apoptotic effects. Whether variation in regional IGFBP-3 expression in the colon may explain the observed pattern of disease in both normal and acromegalic patients is unknown.Aim: 1) To c...

Background:The growth hormone/insulin-like growth factor-I (GH/IGF-I) axis has been increasingly implicated in the development of breast cancer. Previously we have demonstrated the local expression of IGF-I in normal and malignant breast tissue. However the correlation of this local expression with clinical factors has not fully been investigated.Aims: (i) To quantify the mRNA levels of IGF-I in normal and malignant breast tissue and (ii) to identify any correlation betwee...

Background:Recent studies have linked low serum levels of IGFBP-3 with an increased risk of developing breast cancer.In addition to modulating IGF-I bioactivity, IGFBP-3 also exerts IGF-I independent pro-apoptotic effects. Our previous work has demonstrated that IGFBP-3 mRNA expression is significantly down regulated in breast tumours compared to normal breast tissue. It is uncertain, however, how this pattern of expression relates to the pathological and prognostic features o...

Introduction: Cyclooxygenase-2 (COX-2), an inducible enzyme in prostaglandin synthesis, plays a major role in the pathogenesis of sporadic colorectal carcinoma (CRC). COX-2 inhibitors reduce the mortality from sporadic CRC. Acromegaly is associated with an increased risk of CRC, with a preponderance of right sided disease, but COX-2 protein is reduced or absent in acromegalic normal and malignant colonic mucosa. The mechanisms responsible for this are unknown.Aims: (i) To ...