of a symposium. In the present one, chapters are well-organized, opposing or complementary views of the same subject are conveniently juxtaposed, the sometimes amorphous discussion at the end of a group of papers is summarized succinctly rather than printed verbatim, and there is a useful index and bibliography of references. Dr. Franklin McLean has written a helpful introduction containing a s...

This study examined the role of cyclic AMP in the phosphaturic response to parathyroid hormone in vitamin D-deficient rats. Infusion of purified bovine parathyroid hormone (13.3 mug/h) into control, D-fed, or D-deficient, thyroparathyroidectomized rats produced a sixfold increase in renal phosphate and cyclic AMP excretion in D-fed rats, but only a two- to threefold increase in both parameters...

Parathyroid hormone (PTH) is an endocrine peptide found exclusively in the parathyroid glands, whereas hormone-related protein (PTHrP) expressed a wide range of tissues and organs exerts endocrine, paracrine, autocrine actions. PTH PTHrP have similar homology, sharing initial 13 amino acid residues at N-terminus binding to same type 1 receptor (PTH1R), which regulates calcium homeostasis. An ab...

Two synthetic analogues of bovine parathyroid hormone (PTH) with NH2-terminal modifications, PTH-(3-34) and [desamino-Ala-1]PTH-(1-34), were found to lack agonist activity but to demonstrate antagonist properties when tested in the rat renal cortical adenylyl cyclase assay in vitro against the native hormone or against PTH-(1-34), the active synthetic NH2-terminal tetratriacontapeptide. The inh...

INTRODUCTION Hypercalcemia is the major electrolyte abnormality in patients with malignant tumors. It can be due to localized osteolytic hypercalcemia or elaboration of humoral substances such as parathyroid hormone-related protein from tumoral cells. In hematological malignancies, a third mechanism of uncontrolled synthesis and secretion of 1-25(OH)2D3 from tumoral cells or neighboring macroph...

Phosphate deprivation causes a resistance to the phosphaturic effect of parathyroid hormone. The decreased phosphaturic response to parathyroid hormone in rats fed a low phosphate diet for 1 day can be restored by propranolol infusion. Free-flow micropuncture studies were performed to localize the nephron site of restoration of the phosphaturic effect of parathyroid hormone by propranolol in ra...

We have examined if there are any differences in intraoperative and early postoperative concentrations of parathyroid hormone between the first group of patients, who had thyroidectomy surgery performed by harmonic scalpel, and the second group of patients operated on by standard techniqes with the use of electrocoagulation and ligature as primary hemostatic procedures. All the patients having ...

Parathyroid cyst is one of the least common causes neck and mediastinal mass often mistaken be thyroid cyst. Despite advancement in radiological cytological investigations diagnosing a parathyroid had always been clinical challenge for pathology it only diagnosed during histopathological examination post-surgical resection. The pathogenesis includes embryological remnant 3 or 4 branchial arch w...

Parathyroid cyst is a very rare abnormality. The diagnosis can be made based on ultrasound and the analysis of the aspirated cystic fluid for parathyroid hormone (PTH). We report the case of a nonfunctional parathyroid cyst in a 50-year-old female patient with an anterior neck mass. The patient was complaining of pain in the anterior cervical region, dysphagia, dyspnea and dysphonia started thr...