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D Larizza

Publications and source records attributed to D Larizza.

At least 55 records · Page 3Linked to original sources
PubMed1990

Excess of HLA parental sharing in families with Turner patients.

In utero selection processes are probably related to mother-father compatibility as has been reported in abortion-prone couples and in Down syndrome studies. In order to analyse this phenomenon, we investigated families with chromosomal imbalance (Turner syndrome). We chose this model because previous data indicated a high frequency of HLA-A31 and B38 in Turner patients and in their mothers. We report high HLA antigen sharing in Turner families and great histocompatibility between mother and affected daughter, not related to abortion histories. The proportion of HLA-A homozygous cases among Turner children was higher than expected. The level of lymphocytotoxic antibodies against fetus in mothers of Turner patients was comparable to that of mothers of families with normal fertility and probably favoured these pregnancies.

Abortion, Habitual↗
PubMed1990

Poland's syndrome associated with growth hormone deficiency.

A 9 year old boy with Poland's syndrome (absence of the left pectoralis major muscle associated with an ipsilateral malformation of the hand) and isolated growth hormone deficiency, owing to anatomical abnormalities of the pituitary gland, is described. MRI brain scan showed severe hypoplasia of both the sella and anterior lobe of the pituitary gland with absence of the pituitary stalk and ectopia of the posterior lobe. Association of Poland's syndrome and growth hormone deficiency has not been described previously.

Child↗
PubMed1990

Relapsing eruptive psoriasis and immunological changes triggered by growth hormone therapy in a growth hormone-deficient girl.

A 9.8-year-old girl with growth hormone (GH) deficiency and concomitant chronic and localized psoriasis of the groins and axillae showed repeated and sudden relapse of eruptive psoriasis after GH treatment. The aggravating effect of GH and the improvement of the skin condition after withdrawal suggests, at least in this case, that GH plays a significant role in the pathogenesis of psoriasis.

Child↗
PubMed1989

Alterations of in vitro interleukin 1 and 2 in diabetic children.

We studied interleukin 1 (IL-1) and interleukin 2 (IL-2) production in unstimulated and stimulated cultures from 27 young diabetic patients and 21 age-matched healthy subjects. In unstimulated cultures monocytes from newly diagnosed patients produced significantly higher levels of IL-1 than controls. In lipopolysaccharide (LPS)-stimulated cultures, IL-1 production in patients with fresh and long-standing diabetes was no different from that of controls. IL-2 production was low or absent in unstimulated cultures from insulin-dependent diabetes mellitus (IDDM) patients and controls. In phytohaemagglutinin (PHA)-stimulated cultures both patient groups produced significantly less IL-2 than controls. No correlation was observed between IL-1, IL-2 production and HbA1 levels or the presence of HLA-DR3 or DR4. Our data on "spontaneous" IL-1 production support the hypothesis that monocytes from some newly diagnosed IDDM patients may circulate in a "preactivated" state. The low levels of IL-2 might be explained by an abnormal consumption or by the presence of increased soluble IL-2 receptor levels or by a serum factor which interferes with IL-2 production. Alternatively, it may be a genetically determined trait.

Adolescent↗
PubMed1989

Autoimmunity, HLA, Gm and Km polymorphisms in Turner's syndrome.

Considering the high frequency of autoimmune disorders in Turner's syndrome and the close relationship between autoimmunity, HLA and immunoglobulin constant region gene polymorphisms, we studied 46 patients with Turner's syndrome, by determination of autoantibodies, HLA histoglobulins and Gm and Km allotypes. OSA and in particular PCA resulted significantly more frequent in patients than in the controls. A higher frequency of HLA-A31, B38 antigens and of blanks at HLA-A locus was found in Turner's subjects than in the controls. A31 was significantly more frequent in autoantibody positive patients while B38 was more frequent in autoantibody negative Turner's subjects than in the controls. DR4 antigen was present only in autoantibody negative patients. Gm 3; 23; 5* phenotype was significantly less frequent, while Gm 3;..; 5* phenotype was more frequent in patients than in controls. Our data confirm the higher incidence of autoimmunity disorders in Turner's syndrome than in normal subjects. Particular HLA and immunoglobulin types seem to mark this condition. The increase in the blank frequency at A locus could be explained by the presence of a rare antigen at HLA-A locus or a particularly elevated homozygous condition in these subjects.

Adolescent↗
PubMed1989

[Contribution of pelvic ultrasonography in the diagnosis and follow-up of Turner's syndrome].

Between 1983 and 1988, 40 patients with Turner's syndrome, aged 8 to 26 years, underwent serial pelvic ultrasonography, in order to evaluate the morphofunctional parameters of the internal genital apparatus and correlate them with the karyotype and gonadotropin levels. Correlation of uterine and gonadal sonograms (site, size and echogenic potential) with the karyotype and the gonadotropin assays, permits the definition of each case and a personalized therapeutic approach as well as a control of its efficacy and/or its side-effects.

Adolescent↗
PubMed1988

Impairment of the opioidergic control of luteinizing hormone secretion in Turner's syndrome: lack of effect of gonadal steroid therapy.

We studied the activity of endogenous opioid peptides in regulating LH secretion in patients with Turner's syndrome. To do so, we determined the LH secretory response to opiate receptor blockade by naloxone (0.08 mg/kg BW, iv) in 17 patients (age range, 9-23 yr). Eight patients were untreated (3 of whom had had spontaneous menarche), and 9 patients were taking ethinyl estradiol/medroxyprogesterone acetate treatment (5 of these patients were also studied before treatment). In addition, the plasma LH responses to GnRH (50 micrograms, iv) and placebo were determined in the patients as well as in 13 age-matched normal girls (6 prepubertal and 7 pubertal). Naloxone did not increase plasma LH levels in the amenorrheic untreated and treated patients with Turner's syndrome. However, in the 3 patients who had had spontaneous menarche and in normal pubertal girls naloxone increased plasma LH levels. GnRH was effective to the same extent in the patients and normal subjects. These results indicate that in patients with Turner's syndrome the opioidergic inhibition of LH secretion is impaired and is not restored by gonadal steroid replacement therapy. Moreover, the normal plasma LH responses to naloxone in the spontaneously menstruating patients with Turner's syndrome indicate both the clinical variability of this syndrome and the participation of endogenous opioid peptides in the regulation of normal menstrual function.

Adolescent↗
PubMed1986

Difficult hGH treatment in a patient with type III glycogen storage disease.

The case of a boy affected by type III glycogen storage disease and total GH deficiency is reported. Substitutive treatment with hGH caused an extreme elevation of blood lipids. His lipid profile returned near to basal values 1 month after treatment was discontinued. The association of growth hormone and amylo-1-6-glucosidase deficiencies is unusual and difficult to treat; however growth hormone deficiency should be considered in patients with hepatic glycogenoses and severe growth retardation.

Adolescent↗
PubMed1986

Auto-immunity in children with diabetes mellitus and in their relatives.

Islet cell antibodies (ICA-IgG and complement-fixing-ICA), parietal cell antibodies (PCA), intestinal epithelial cell antibodies (IECA), thyroglobulin (TgA) and thyroid microsomal antibodies (MsA), antinuclear (ANA) and reticulin antibodies (RA), were studied in 55 insulin-dependent diabetic patients (30 males and 25 females), aged 2-19 years with diabetes from a few days up to 14 years. In 58% of the diabetics one or more autoantibodies were found: ICA-IgG (31%), CF-ICA (16%), PCA (34%), TgA (9%), MsA (9%), ANA (13%), RA (2%). Autoantibodies were significantly more frequent in females (76%) than in males (43%) (P less than 0.025). ICA-IgG, CF-ICA, PCA, ANA were significantly more frequent in patients than in controls. The frequency of ICA-IgG and CF-ICA was significantly higher during the first 3 years of disease than afterwards (P less than 0.001); a similar pattern was observed for PCA, TgA, MsA. Of the 87 parents and 30 siblings screened for ICA-IgG, CF-ICA, PCA, IECA, TgA, MsA, ANA and RA, 42 (44%) had one or more autoantibodies, which were more frequent in females than in males. Seven relatives (6%) were ICA-IgG positive (four mothers, two fathers and one brother), and only one mother, ICA-IgG negative, was CF-ICA positive. Other autoantibodies were also more frequent in parents than in controls. Autoantibody-positive relatives have been asymptomatic up to now.

Adolescent↗
PubMed1986

Serum thymidine activity and somatomedin-C levels in children and adolescents with Turner's syndrome: effect of chronic estrogen and progestogen replacement therapy.

Turner's syndrome has been used as a model of primary hypogonadism to assess the role of estrogen-progestogen replacement therapy on serum thymidine activity (TA) and somatomedin-C (Sm-C) levels. 33 subjects with gonadal dysgenesis were studied: 10 untreated and 13 treated with estrogen-progestogen combination. In 10 untreated patients serum TA was 1.02 +/- (SEM) 0.04 U/ml and serum Sm-C value was 27.82 +/- 4.14 nmol/l, both similar to those in the age-matched normal children. A positive correlation was found between Sm-C and the bone age (r = 0.891, p less than 0.002). In the 13 treated subjects, the estrogen-progestogen combination as replacement therapy induced a significant increase in Sm-C level (40.52 +/- 4.30 nmol/l, p less than 0.05). No variation was observed for serum thymidine activity between the two groups of subjects.

Adolescent↗