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Biomedical subjects

J Vendrell

Publications and source records attributed to J Vendrell.

At least 37 records · Page 2Linked to original sources
PubMed1989

Late-onset hypocalcemia appearing years after thyroid surgery.

We revised four cases of hypocalcemia diagnosed yr after thyroid surgery, including 1 man and 3 women, operated 5-23 yr before the onset of symptoms, which ranged from mild paresthesia to convulsive seizures. Total serum calcium levels ranged from 1.1 to 2.05 mmol/l, and PTH levels were low in the 3 cases in which they were measured. Hypoparathyroidism appearing as late-onset hypocalcemia after extense thyroid surgery is a poorly understood condition, perhaps not as unfrequent as it is considered.

Adult↗
PubMed1989

Procarboxypeptidase A activation segment compared to structures of other proteins.

The 94-residue activation segment of procarboxypeptidase A was compared with segments of other proteins. No significant homologies were observed towards other activation segments, but an inter-domain segment preceding the serine-protease part of complement factor B showed some structural relationships with the N-terminal region of the procarboxypeptidase A activation segment. This may reflect common functional and organizational patterns. In contrast, the present comparisons do not give functional or further sequence support to previously proposed structural homologies with helix-loop-helix (EF-hand) calcium-binding proteins.

Amino Acid Sequence↗
PubMed1988

Analysis of the conformation and ligand-binding properties of the activation segment of pig procarboxypeptidase A.

The isolated activation segment of pig procarboxypeptidase A binds two Tb3+ ions in a strong and specific way. In contrast, the binding of Ca2+, Cd2+ and Mg2+ is weak. The binding of Tb3+ increases the resistance of the isolated activation segment against proteolysis and competes for the binding of the carbocyanine dye Stains-All. This dye forms complexes with the activation segment showing spectral properties similar to those observed with EF-hand structures. The presented results support a previous hypothesis on the existence of two regions in the activation segment of pancreatic procarboxypeptidases structurally related to Ca2+-binding domains of the EF-hand protein family.

Animals↗
PubMed1988

A case with persistent nephrogenic diabetes insipidus following parathyroidectomy for hyperparathyroidism.

A 25-year-old woman with persistent nephrogenic diabetes insipidus (NDI) following parathyroidectomy for primary hyperparathyroidism is described. NDI is a well recognized complication of primary hyperparathyroidism, generally imputed to hypercalcemia, and promptly reversible after correcting it. In our case, the impaired concentrating ability of the renal tubule was irreversible after the removal of the parathyroid adenoma and the correction of the hypercalcemia, presumptively due to the morphological irreversible changes in the kidney. In addition, hypercalciuria persisted and was the cause of a compensatory hyperparathyroidism. Treatment with thiazide diuretic was effective to decrease relative hypercalciuria, thus reversing the compensatory hyperparathyroidism.

Adenoma↗
PubMed1988

Erythromelalgia associated with acute diabetic neuropathy: an unusual condition.

Erythromelalgia is a syndrome characterized by erythema, burning pain and increased skin temperature of the affected extremities. It can be either primary (idiopathic) or secondary, but both forms require a critical temperature between 32-36 degrees C to provoke the crisis. Among the secondary forms, its association with diabetes mellitus is infrequent and its significance is little known. The histological studies have been fundamentally performed in patients with this syndrome affected by thrombocythemia; vascular thrombosis and fibromuscular intimal arteriolar proliferation were the prominent findings not corroborated in patients with the primary form. We studied one patient with acute diabetic neuropathy who developed erythromelalgia. We noted the absence of histopathological lesions, suggesting a disorder in vascular motility regulation favored by the severe neuropathy, without being able to discount a possible immunomediated mechanism. We describe the favourable evolution of the patient after treatment with aspirin and methysergide.

Acute Disease↗
PubMed1987

Conformational predictive studies on the activation segment of pancreatic procarboxypeptidases.

Little is known about the conformation and evolutionary origin of the activation segment of pancreatic procarboxypeptidases. Analysis of the sequence and secondary structure propensities of these propeptide segments indicate that they contain two regions structurally related to the Ca2+-binding sites of the EF-hand protein family. This proposed homology could explain how (and why) carboxypeptidases developed such long (94 residues) activation peptides.

Animals↗