A Case of Type 1 Cryoglobulinemia With Lymphoplasmacytic Lymphoma and Dry Gangrene

Lymphoplasmacytic lymphoma (LPL) is an uncommon condition, accounting for only 2% of all non-Hodgkin's lymphoma cases. Individuals with LPL face the risk of vascular blockage when associated with type I cryoglobulinemia, leading to related symptoms. Until now, no instances of LPL with dry gangrene have been documented. However, we present a rare case involving LPL accompanied by dry gangrene in both the right upper extremity (RUE) and left lower extremity (LLE). The patient was effectively managed using a combination of chemotherapy, steroids, plasmapheresis, and salvage surgery.

Bilingualism and language in children with autistic spectrum disorder: a systematic review

INTRODUCTION

Communication and language skills are among the most severely affected domains in individuals with autistic spectrum disorder (ASD). When a child diagnosed with ASD lives in a bilingual environment, the parents often express concerns about whether their child should learn both languages simultaneously, turning to specialists for advice. Despite the lack of evidence of any negative effect, some professionals disagree on this subject. In this systematic review we study whether bilingualism affects language development in children with ASD.

METHODS

We reviewed the literature published in 4 different databases. After applying a series of selection criteria, we selected 12 scientific articles, including a total of 328 children diagnosed with ASD (169 bilingual and 159 monolingual), with ages ranging from 3 to 12 years. These patients were evaluated with different receptive and expressive language assessment instruments covering several areas. The assessments were performed directly on the children, although indirect assessment of parents was also performed in some studies.

CONCLUSIONS

There seems to be consensus regarding the assertion that bilingualism does not entail any additional difficulty for language development in children with ASD from the age of 3.

Grammatical comprehension in language and communication disorders

Autism Spectrum Disorder (ASD) and Developmental Language Disorder (DLD) have traditionally been considered separate disorders, although some similarities and overlaps in certain aspects of language have been detected. In this paper, we compare the deficits in receptive grammar in these two disorders. We analyse the proportion of grammatical errors in relation to semantic complexity in 84 children divided into four groups: children with autism language impairment (ALI), with autism language normal (ALN), with DLD, and with typical development (TD), all groups with the same age of receptive vocabulary. The results show significant differences in the comprehension of grammatical structures, both simple (canonical and non-reversible) and complex (non-canonical and reversible). Children with ASD and DLD show different language profiles depending on the syntactic complexity. In the simplest structures, no differences are found between the groups, starting at an equivalent vocabulary age of 7:8 years. However, there are differences between the ALI and DLD groups with respect to the TD group in the more complex structures, starting at an equivalent vocabulary age of 3 years. Therefore, both groups ALI and DLD present the greatest difficulties compared to ALN and TD. The paper discusses the importance of attending to these differences, since the repercussion of comprehension difficulties increases as children grow.

[Psychological adaptation in children with autism spectrum disorder and its effect on family quality of life]

INTRODUCTION

In most children with autism spectrum disorder (ASD), other difficulties that do not fall within the diagnostic criteria arose, and could have an impact on family quality of life. Previous research has shown several relationships among these variables and family quality of life, however results are contradictories.

AIM

To examine the role of psychological adaptation (including emotional symptoms, behavioral problems, hyperactivity, problems with peers, and prosocial behavior) in children with ASD and typical development, and its impact on family quality of life.

SUBJECTS AND METHODS

Twenty-four families of children with ASD (level 1 of support) and 25 families of children with typical development between 6 and 13 years old. We have considered diagnosis of Asperger syndrome (following DSM-IV-TR) with ASD-level 1 of support (following DSM-5). We have evaluated intelligence, vocabulary, adaptive behavior, and family quality of life.

RESULTS

We have found significant differences in those variables related to psychological adaptation, and in some components of the family quality of life (family interaction, physical and emotional wellbeing). In our regression model, prosocial behaviors and the group were the main predictors of satisfaction on family quality of life.

CONCLUSION

It is important to pay attention to the prosocial behaviors in ASD due to its potential protective effect.

Bilingualism and language in children with autistic spectrum disorder: a systematic review

INTRODUCTION

Communication and language skills are among the most severely affected domains in individuals with autistic spectrum disorder (ASD). When a child diagnosed with ASD lives in a bilingual environment, the parents often express concerns about whether their child should learn both languages simultaneously, turning to specialists for advice. Despite the lack of evidence of any negative effect, some professionals disagree on this subject. In this systematic review we study whether bilingualism affects language development in children with ASD.

METHODS

We reviewed the literature published in 4 different databases. After applying a series of selection criteria, we selected 12 scientific articles, including a total of 328 children diagnosed with ASD (169 bilingual and 159 monolingual), with ages ranging from 3 to 12 years. These patients were evaluated with different receptive and expressive language assessment instruments covering several areas. The assessments were performed directly on the children, although indirect assessment of parents was also performed in some studies.

CONCLUSIONS

There seems to be consensus regarding the assertion that bilingualism does not entail any additional difficulty for language development in children with ASD from the age of 3.

[Linguistic impairments in patients with mild cognitive impairment: a systematic review]

INTRODUCTION

The neuropsychological profile of patients with mild cognitive impairment (MCI) has been the target of several investigations. However, few works have been published about the language profile in these patients.

AIM

To analyse and integrate the published scientific literature about this topic after the systematic review carried out by Johnson and Lin in 2014.

SUBJECTS AND METHODS

A systematic review was carried out in which three databases (Web of Science, PubMed and PsycInfo) were consulted. Seventeen studies have been analysed, with adult participants diagnosed with MCI, that included at least one control group, and studies that evaluated language parameters. A self-made registration protocol has been applied to encode the characteristics and results of the studies; and the quality of the studies and articles has been evaluated through a self-elaboration scale based on previously validated instruments.

RESULTS

Patients with MCI can present deficits in naming, speech production, oral comprehension, and written comprehension.

CONCLUSIONS

It is important to evaluate language in patients with MCI, although this exploration does not allow establishing a diagnosis on by itself. However, the pathology variability associated with the diagnosis, the age, the language, and the educational level of the participants, as well as the sample size, and the instruments and measures used to evaluate the language in the studies reviewed, make impossible to obtain a conclusive statement, so further research about this topic is needed.

Trend of in-hospital deaths by pulmonary embolism in Ecuador. Findings from 2011-2018 national reports

BACKGROUND

Pulmonary embolism (PE) is a potentially fatal disease related to venous thromboembolism. Information regarding this pathology in the Ecuadorian population is limited. This study aims to present the PE hospital mortality rates (HMR) in Ecuador, analyze its trend and risk factors.

METHODS

An epidemiological, descriptive and cross-sectional study based on the reporting and trend analysis of pulmonary embolism HMR in the Ecuadorian population from 2011 to 2018 through the governmental database of the Ecuadorian National Statistics and Census Institute, was conducted.

RESULTS

In Ecuador, PE hospital discharges (HD) varied from 358 in 2011 to 424 in 2018. More than 60% of patients were older than 60 years. Also, the frequency of PE with acute cor pulmonale increased from 3.07% in 2011 to 16.98% in 2018 (P<0.05). The HMR by 100 HD increased between 2011 (12.85/100 HD) and 2018 (17.02/100 HD) (P<0.05), with the highest rate reported in 2017 (21.52/100 HD). In the period studied, 505 in-hospital deaths were reported in patients with PE, the average age in this group was 64.3 years, 58.42% were female, and 10.89% had acute cor pulmonale (ICD-10 I26.0). Risk factors associated with PE in-hospital death were acute cor pulmonale (OR 1.63, 95% CI: 1.18 to 2.25, P<0.01) and 60 years or more (OR 1.73, 95% CI 1.40-2.15, P<0.01).

CONCLUSION

A significant increase in PE HMR in Ecuador was found. Also, acute cor pulmonale and age of 60 years or more may be potential risk factors for in-hospital death in patients with PE.

Consistency and identifiability of football teams: a network science perspective

We investigated the ability of football teams to develop a particular playing style by looking at their passing patterns. Using the information contained in the pass sequences during matches, we constructed the pitch passing networks of teams, whose nodes are the divisions of the pitch for a given spatial scale and links account for the number of passes from region to region. We translated football passings networks into their corresponding adjacency matrices. We calculated the correlations between matrices of the same team to quantify how consistent the passing patterns of a given team are. Next, we quantified the differences with other teams’ matrices and obtained an identifiability parameter that indicates how unique are the passing patterns of a given team. Consistency and identifiability rankings were calculated during a whole season, allowing to detect those teams of a league whose passing patterns are different from the rest. Furthermore, we found differences between teams playing at home or away. Finally, we used the identifiability parameter to investigate what teams imposed their passing patterns over the rivals during a given match.

Functional annotation of human long noncoding RNAs via molecular phenotyping

Long noncoding RNAs (lncRNAs) constitute the majority of transcripts in the mammalian genomes, and yet, their functions remain largely unknown. As part of the FANTOM6 project, we systematically knocked down the expression of 285 lncRNAs in human dermal fibroblasts and quantified cellular growth, morphological changes, and transcriptomic responses using Capped Analysis of Gene Expression (CAGE). Antisense oligonucleotides targeting the same lncRNAs exhibited global concordance, and the molecular phenotype, measured by CAGE, recapitulated the observed cellular phenotypes while providing additional insights on the affected genes and pathways. Here, we disseminate the largest-to-date lncRNA knockdown data set with molecular phenotyping (over 1000 CAGE deep-sequencing libraries) for further exploration and highlight functional roles for ZNF213-AS1 and lnc-KHDC3L-2.

Functional diversification of teleost Fads2 fatty acyl desaturases occurs independently of the trophic level

The long-chain (≥C20) polyunsaturated fatty acid biosynthesis capacity of fish varies among species, with trophic level hypothesised as a major factor. The biosynthesis capacity is largely dependent upon the presence of functionally diversified fatty acyl desaturase 2 (Fads2) enzymes, since many teleosts have lost the gene encoding a Δ5 desaturase (Fads1). The present study aimed to characterise Fads2 from four teleosts occupying different trophic levels, namely Sarpa salpa, Chelon labrosus, Pegusa lascaris and Atherina presbyter, which were selected based on available data on functions of Fads2 from closely related species. Therefore, we had insight into the variability of Fads2 within the same phylogenetic group. Our results showed that Fads2 from S. salpa and C. labrosus were both Δ6 desaturases with further Δ8 activity while P. lascaris and A. presbyter Fads2 showed Δ4 activity. Fads2 activities of herbivorous S. salpa are consistent with those reported for carnivorous Sparidae species. The results suggested that trophic level might not directly drive diversification of teleost Fads2 as initially hypothesised, and other factors such as the species' phylogeny appeared to be more influential. In agreement, Fads2 activities from P. lascaris and A. presbyter were similar to their corresponding phylogenetic counterparts Solea senegalensis and Chirostoma estor.

Methyl-end desaturases with ∆12 and ω3 regioselectivities enable the de novo PUFA biosynthesis in the cephalopod Octopus vulgaris

The interest in understanding the capacity of aquatic invertebrates to biosynthesise omega-3 (ω3) long-chain (≥C₂₀) polyunsaturated fatty acids (LC-PUFA) has increased in recent years. Using the common octopus Octopus vulgaris as a model species, we previously characterised a ∆5 desaturase and two elongases (i.e. Elovl2/5 and Elovl4) involved in the biosynthesis of LC-PUFA in molluscs. The aim of this study was to characterise both molecularly and functionally, two methyl-end (or ωx) desaturases that have been long regarded to be absent in most animals. O. vulgaris possess two ωx desaturase genes encoding enzymes with ∆12 and ω3 regioselectivities enabling the de novo biosynthesis of the C₁₈ PUFA 18:2ω6 (LA, linoleic acid) and 18:3ω3 (ALA, α-linolenic acid), generally regarded as dietary essential for animals. The O. vulgaris ∆12 desaturase ("ωx2") mediates the conversion of 18:1ω9 (oleic acid) into LA, and subsequently, the ω3 desaturase ("ωx1") catalyses the ∆15 desaturation from LA to ALA. Additionally, the O. vulgaris ω3 desaturase has ∆17 capacity towards a variety of C₂₀ ω6 PUFA that are converted to their ω3 PUFA products. Particularly relevant was the affinity of the ω3 desaturase towards 20:4ω6 (ARA, arachidonic acid) to produce 20:5ω3 (EPA, eicosapentaenoic acid), as supported by yeast heterologous expression, and enzymatic activity exhibited in vivo when paralarvae were incubated in the presence of [1-¹⁴C]20:4ω6. These results confirmed that several routes enabling EPA biosynthesis are operative in O. vulgaris whereas ARA and docosahexaenoic acid (DHA, 22:6ω3) should be considered essential fatty acids since endogenous production appears to be limited.

EXPERIMENTAL EVALUATION OF NEUTRON SHIELDING MATERIALS

A new proposed design of neutron shielding material-based on the commercial material Borotron UH050 with an addition of Al(OH)3-is evaluated in order to determine if its neutron and gamma shielding properties match those of a reference material, NS4FR. Neutron and gamma dosimetry measurements are performed, as well as neutron spectrometry measurements and Monte Carlo simulations. Negligible differences are found between the materials for neutron shielding, while significant differences are found for gamma shielding. The effect of Al(OH)3 addition to Borotron UH050 is to reduce neutron shielding properties while increasing gamma shielding properties. The resulting material is as efficient as NS4FR for neutron shielding but less efficient for gamma shielding-thicknesses 20% higher are required to match gamma shielding properties of NS4FR. Monte Carlo models of the materials are validated based on the performed measurements of neutron spectra and neutron and gamma ambient dose equivalent.

Transcriptomic changes in Cucurbita pepo fruit after cold storage: differential response between two cultivars contrasting in chilling sensitivity

Background

Zucchini fruit is susceptible to chilling injury (CI), but the response to low storage temperature is cultivar dependent. Previous reports about the response of zucchini fruit to chilling storage have been focused on the physiology and biochemistry of this process, with little information about the molecular mechanisms underlying it. In this work, we present a comprehensive analysis of transcriptomic changes that take place after cold storage in zucchini fruit of two commercial cultivars with contrasting response to chilling stress.

Results

RNA-Seq analysis was conducted in exocarp of fruit at harvest and after 14 days of storage at 4 and 20 °C. Differential expressed genes (DEGs) were obtained comparing fruit stored at 4 °C with their control at 20 °C, and then specific and common up and down-regulated DEGs of each cultivar were identified. Functional analysis of these DEGs identified similarities between the response of zucchini fruit to low temperature and other stresses, with an important number of GO terms related to biotic and abiotic stresses overrepresented in both cultivars. This study also revealed several molecular mechanisms that could be related to chilling tolerance, since they were up-regulated in cv. Natura (CI tolerant) or down-regulated in cv. Sinatra (CI sensitive). These mechanisms were mainly those related to carbohydrate and energy metabolism, transcription, signal transduction, and protein transport and degradation. Among DEGs belonging to these pathways, we selected candidate genes that could regulate or promote chilling tolerance in zucchini fruit including the transcription factors MYB76-like, ZAT10-like, DELLA protein GAIP, and AP2/ERF domain-containing protein.

Conclusions

This study provides a broader understanding of the important mechanisms and processes related to coping with low temperature stress in zucchini fruit and allowed the identification of some candidate genes that may be involved in the acquisition of chilling tolerance in this crop. These genes will be the basis of future studies aimed to identify markers involved in cold tolerance and aid in zucchini breeding programs.

Electronic supplementary material

The online version of this article (10.1186/s12864-018-4500-9) contains supplementary material, which is available to authorized users.

[Communicative and social-adaptive profile in children with autism spectrum disorder: a new approach based on the DSM-5 criteria]

INTRODUCTION

Following the adoption of the new international diagnosis classification from the Diagnostic and Statistical Manual (DSM-5), autism spectrum disorder (ASD) has been established as a dimensional category that includes other disorders that were previously considered as separate entities. Previous research has shown that some people with this disorder exhibit different communicative and linguistic profiles. Therefore, contradictory results could be found among people who receive the same diagnosis.

AIM

To distinguish structural language aspects (expression and comprehension), interactive aspects (pragmatics), and social adaptation between children with an ASD-level 1 of support and children with typical development.

SUBJECTS AND METHODS

Seventeen children with Asperger syndrome (according to the DSM-IV-TR), and 20 children with typical development between 7 and 12 years old. We have equated diagnosis of Asperger syndrome with ASD-level 1 of support. We have evaluated intelligence quotient, communication, and social adaptation with direct and indirect standardized parental scales.

RESULTS

We have found significant differences in comprehension (p = 0.025), interaction (p = 0.001), and social adaptation (p = 0.001) between the two groups.

CONCLUSIONS

Subjects with ASD-level 1 of support demonstrate an average intelligence quotient, and good expressive structure (syntax and semantic level), which may be different from other children who receive the same diagnosis, due to the wide heterogeneity of the disorder. Nevertheless, our subjects have problems related to comprehension of grammar structure, pragmatics, and social adaptation. These difficulties could be related to emotional and social problems.

Time Course of Metabolic Capacities in Paralarvae of the Common Octopus, Octopus vulgaris, in the First Stages of Life. Searching Biomarkers of Nutritional Imbalance

The culture of the common octopus (Octopus vulgaris) is promising since the species has a relatively short lifecycle, rapid growth, and high food conversion ratios. However, recent attempts at successful paralarvae culture have failed due to slow growth and high mortality rates. Establishing an optimal nutritional regime for the paralarvae seems to be the impeding step in successful culture methods. Gaining a thorough knowledge of food regulation and assimilation is essential for paralarvae survival and longevity under culture conditions. The aim of this study, then, was to elucidate the characteristic metabolic organization of octopus paralarvae throughout an ontogenic period of 12 days post-hatching, as well as assess the effect of diet enrichment with live prey containing abundant marine phospholipids. Our results showed that throughout the ontogenic period studied, an increase in anaerobic metabolism took place largely due to an increased dependence of paralarvae on exogenous food. Our studies showed that this activity was supported by octopine dehydrogenase activity, with a less significant contribution of lactate dehydrogenase activity. Regarding aerobic metabolism, the use of amino acids was maintained for the duration of the experiment. Our studies also showed a significant increase in the rate of oxidation of fatty acids from 6 days after-hatching. A low, although sustained, capacity for de novo synthesis of glucose from amino acids and glycerol was also observed. Regardless of the composition of the food, glycerol kinase activity significantly increased a few days prior to a massive mortality event. This could be related to a metabolic imbalance in the redox state responsible for the high mortality. Thus, glycerol kinase might be used as an effective nutritional and welfare biomarker. The studies in this report also revealed the important finding that feeding larvae with phospholipid-enriched Artemia improved animal viability and welfare, significantly increasing the rate of survival and growth of paralarvae.

Extensive Chest Wall Destruction Secondary to a Large Ventricle Pseudoaneurysm: A Surgical Challenge

Left ventricular pseudoaneurysms have become a rare complication of acute myocardial infarction, occurring in approximately 2% of cases and even less frequently when primary percutaneous intervention can be performed. Regardless of treatment strategy, left ventricle pseudoaneurysms are associated with a high mortality rate. We report on the extremely rare occurrence of a patient surviving two episodes of free wall rupture associated with extensive chest wall destruction and secondary traumatic rib fractures. The key to success in this case is related to both the cardiac and chest wall repair.

Cloning and characterisation of a putative pollen-specific polygalacturonase gene (CpPG1) differentially regulated during pollen development in zucchini (Cucurbita pepo L.)

Studies in zucchini (Cucurbita pepo L. spp. pepo) pollen have been limited to the viability and morphology of the mature pollen grain. The enzyme polygalacturonase (PG) is involved in pollen development and pollination in many species. In this work, we study anther and pollen development of C. pepo and present the cloning and characterisation of a putative PG CpPG1 (Accession no. HQ232488) from pollen cDNA in C. pepo. The predicted protein for CpPG1 has 416 amino acids, with a high homology to other pollen PGs, such as P22 from Oenothera organensis (76%) and PGA3 from Arabidopsis thaliana (73%). CpPG1 belongs to clade C, which comprises PGs expressed in pollen, and presents a 34 amino acid signal peptide for secretion towards the cell wall. DNA-blot analysis revealed that there are at least another two genes that code for PGs in C. pepo. The spatial and temporal accumulation of CpPG1 was studied by semi-quantitative- and qRT-PCR. In addition, mRNA was detected only in anthers, pollen and the rudimentary anthers of bisexual flowers (only present in some zucchini cultivars under certain environmental conditions that trigger anther development in the third whorl of female flowers). However, no expression was detected in cotyledons, stem or fruit. Furthermore, CpPG1 mRNA was accumulated throughout anther development, with the highest expression found in mature pollen. Similarly, exo-PG activity increased from immature anther stages to mature anthers and mature pollen. Overall, these data support the pollen specificity of this gene and suggest an involvement of CpPG1 in pollen development in C. pepo.

Promoter activity of a putative pollen monosaccharide transporter in Petunia hybrida and characterisation of a transposon insertion mutant

For the growth of the male reproductive cells of plants, the pollen, the presence of sufficient sucrose or monosaccharides is of vital importance. From Petunia hybrida a pollen-specific putative monosaccharide transporter designated PMT1 (for petunia monosaccharide transporter) has been identified previously. The present work provides an in-depth analysis and characterisation of PMT1 in the context of pollen development with the GUS reporter gene and an insertion mutant. The promoter of the pollen-specific putative PMT1 gene has been isolated by inverse PCR and sequenced. Analysis of plants transformed with the promoter-GUS fusion confirmed the specificity of this gene, belonging to the late pollen-specific expressed genes. GUS activity was detected even after 24 h of in vitro pollen germination, at the pollen tube tip. To elucidate the importance of PMT1 for gametophyte development and fertilisation, we isolated a mutant plant containing a transposon insertion in the PMT1 gene by the dTph1 transposon-tagging PCR-based assay. The PMT1 mutant contained a dTph1 insertion in position 1474 bp of the transcribing part of the gene, before the last two transmembrane-spanning domains. Analysis of the progeny of the heterozygous mutant after selfing revealed no alterations in pollen viability and fertility. Mature pollen grains of a plant homozygous for the transposon insertion were able to germinate in vitro in a medium containing sucrose, glucose, or fructose, which indicates that PMT1 is not essential for pollen survival. Several explanations for these results are discussed in the present work.

Comparative study of airborne viable particles assessment methods in microbiological environmental monitoring

A comparative study was done among available assessment methods to measure airborne viable particles in controlled rooms. Active methods were compared (sieve/nozzle impactor, slit-to-agar, centrifugal, filtration, and impinger). The comparative study was carried out by means of a two-way (factors: day and method) analysis of variance, after to logarithmical transformation of experimental results in order to fulfill the normality test of the variables. Statistically significant differences were found among the results of the five methods (P < 0.0001). In a post hoc study, by means of Tukey's test, no differences were found among centrifugal, filtration, and impinger methods. Differences were found among all the other methods (P < 0.05). It is concluded that centrifugal, filtration, and impinger methods (in which numerical results were higher than in the others) may be the most suitable methods for microbiological monitoring of a clean room. The mean results among the three selected active methods were compared with results on the settle plate (SP) (the passive method). A relationship was established between results of the passive method (CFU/h/plate 90 mmø) and the results of active methods (CFU/m3 air). By means of a lineal regression study, it was obtained a relation factor of 22.7; (95% CI: 19.7, 25.7). This factor is only valid for values between 3 and 16 in CFU/h/plate 90 mmø, and it is put on record that the experimental study took place in a room that fulfills Class D clean room specifications (WHO standards) in microbiological terms.

Insulin resistance and hypertension in postmenopausal women

The aim of the study was to elucidate the role of hyperinsulinaemia/insulin resistance in hypertension of lean postmenopausal women. Twenty-four women with essential hypertension (systolic/diastolic > or =140/90 mm Hg) and a body mass index (BMI) less than 26 kg/m(2) not receiving antihypertensive treatment or who had been without treatment for a 4-week washout period, and 10 normotensive postmenopausal weight- and aged-matched controls were compared. Both groups were not receiving hormone replacement therapy. Hip and waist circumferences were measured and waist/hip ratios were calculated. Casual blood pressure was measured in triplicate. Neither the fasting plasma glucose nor serum insulin levels in hypertensive women and normotensives differed significantly. During 2 h oral glucose (75 g)-tolerance test the mean plasma glucose levels after 30 min (172.5 +/- 40.24 mg/dl vs. 143.67 +/- 20.16 mg/dl), 60 min (134.88 +/- 38.78 mg/dl vs. 112.33 +/- 5.44 mg/dl) and 120 min (116.08 +/- 26.65 mg/dl vs. 95.56 +/- 20.17 mg/dl) were significantly higher in hypertensives than that for normotensives (P < 0.05 for all three comparisons). The mean serum insulin levels of hypertensive women were significantly higher than that in normotensives after 15 min (92.04 +/- 59.90 microU/ml vs. 54.89 +/- 33.67 microU/ml) and 120 min (49.63 +/- 44.45 microU/ml vs. 19.22 +/- 24.10 microU/ml; P< 0.05 for both comparisons). The mean serum insulin: plasma glucose ratio for hypertensive women was significantly higher than that for normotensives after 15 min (0.596 +/- 0.46 vs. 0.359 +/- 0.20 microU/mg), 60 min (0.406 +/- 0.30 vs. 0.329 +/- 0.25 microU/mg) and 120 min (0.436 +/- 0.35 vs. 0.205 +/- 0.26 microU/mg) (P < 0.05 for all three comparisons). Significant correlations were observed between the daytime period and 24-h average ambulatory systolic blood pressure and the area under the serum insulin curve (r = 0.41 and 0.36, respectively). For non-dippers we found higher fasting insulinaemias but the AUC(insulin) did not differ. Plasma glucose levels did not differ either during fasting or during OGTT (AUC(glucose)). Insulinogenic index was higher in dippers than in non-dippers. We conclude that in lean, postmenopausal hypertensive women insulin resistance is increased compared with age- and weight-matched normotensive women. Also, hyperinsulinaemia correlates with ambulatory systolic blood pressure. Thus, insulin resistance may possibly be involved as a pathogenetic factor in lean, postmenopausal hypertensive women.

Altered circadian blood pressure profile in patients with active acromegaly. Relationship with left ventricular mass and hormonal values

To determine the relationships between the circadian blood pressure profile and left ventricular mass, hormonal pattern and insulin sensitivity indices in patients with active acromegaly, ambulatory 24-h blood pressure monitoring (ABPM) was recorded in 25 subjects (47.0 +/- 15.1 years, range 23-72). Serum growth hormone (GH) and insulin-like growth factor-1, fasting and mean plasma glucose and insulin during oral glucose tolerance test (OGTT), insulinogenic index, the sum of the plasma insulin levels and the homeostasis model insulin resistance index (Homa's index) were determined. Left ventricular mass index (LVMI) was calculated from two-dimensional guided M-mode echocardiogram. The prevalence of hypertension was 56% (n = 14) and 40% (n = 10) according to sphygmomanometric measurements and ABPM, respectively. Non-dipping profile was observed in six of 10 hypertensives and in six of 15 normotensives. Serum growth hormone, fasting glucose, the area under the serum insulin curve and LVMI were higher for acromegalics with non-dipping profile than for dippers (all of them, P < 0.05). In non-dippers daytime heart rate was higher than night time (P < 0.001). In conclusion, the main observations in the present study suggested that both normotensive and hypertensive acromegalics had a highly prevalent non-dipping profile with a preserved circadian pattern of heart rate, that was associated with higher levels of serum GH. The disturbance in nocturnal blood fall in normotensives was associated with a decreased insulin sensitivity. The role of GH in blood pressure circadian rhythm regulation in essential hypertension deserves further studies.

Natural estrous cycle in normal and diabetic bitches. II). Serum nonesterified fatty acids and serum free glycerol levels during glucose and insulin tests

Actions and interactions of spontaneous diabetes mellitus (DM) and natural estrous cycles (sex seasons) on the regulation of serum nonesterified fatty acids (NEFAs) and free glycerol (FG) levels in bitches in the fasting condition and during i.v. glucose (IVGTT) and insulin (ITT) tolerance tests, were studied. DM increased serum NEFAs concentration both in the basal condition and during IVGTT; it provoked a fall response to glucose load which is absent in normal controls. Estrous cycles did not modify these observations. Serum NEFAs levels during ITT were unresponsive in normal and diabetic bitches at every sex stage; flat, overlapped serum NEFAs profiles were then observed except for the diabetic group at A, which showed an early abrupt fall response of this variable from its high base line. DM increased also serum FG concentration in the fasting condition and during IVGTT. In the normal controls, serum FG base line was not affected by sex status; similarly shaped, increasing, overlapped curves during the test were observed. In the diabetic bitches "in season" (either phase), serum FG basal value was hardly above in respect to anestrous, but during IVGTT their flat profiles coincided. DM increased serum FG concentration in the basal condition and during ITT, and modified the profiles of this variable. In normal dogs in the basal condition, serum FG concentration remained unaffected by sex status; this variable hard, transiently increased during ITT, which was not influenced by "sex seasons"; therefore, similarly shaped, overlapped serum FG profiles were then observed. In the normal and diabetic bitches, serum-FG base line was not changed by "sex seasons". During ITT, serum FG mean profile in the diabetic bitches at EP was modestly above that observed in those at LP; differences for any other comparisons in normals or diabetic bitches were nonsignificant. As reported by us elsewhere, impaired glucose metabolism and absolute insulin deficiency induced ketose-prone, acidotic, insulin-dependent diabetic chryses in certain normal and diabetic beaches "in season" studied here. The unability of these animals for hydrolizing glyceride-glycerol via lipoproteinlipase (IVGTT) or via hormone sensitive fractions of lipase (ITT) and the abolished serum NEFAs suppressibility during modest hiperinsulinemia (ITT) appear to contribute to the production of such chryses. Results are discussed on the basis of interactions of serum NEFAs and FG with respective blood sugar and serum immunoreactive insulin levels as influenced by DM and estrous cycle.

Serum bile acids and pruritus in hemodialysis patients

BACKGROUND

Chronic renal failure (CRF) patients usually suffer from pruritus. The pathophysiology of pruritus is still incompletely understood.

SUBJECTS, MATERIALS AND METHODS

In this paper we determined serum total bile acids (STBA) in hemodialysis patients with advanced CRF (ACRF) in order to obtain STBA concentration in predialysis, to assess their probable relation among patients with pruritus and in postdialysis using a polysulfone membrane for dialysis. STBA were determined in 49 ACRF patients with chronic hemodialysis and values were compared to 20 control subjects. Hemodialysis patients were divided in two groups: with and without pruritus. In all these patients, month of renal replacement therapy, diabetic patients, dose of dialysis (Kt/V), viral markers, serum creatinine, serum glucose, aspartate and alanine aminotransferase, alkaline phosphatase, hematocrits and albumin were determined. The intensity of itching among pruritic patients was measured by a score system: mild (M), moderate (MO) and severe (S).

RESULTS

No significant differences were found in patients with and without pruritus in months of renal replacement therapy, duration of dialysis or dose of dialysis (Kt/V). STBA were determined in all ACRF patients in predialysis and they showed significant differences compared to controls (p < 0.05), however, no differences were observed in the results obtained when control subjects were compared to ACRF patients without pruritus. Also in predialysis, pruritic patients showed significant differences in STBA compared to patients without pruritus (p < 0.001). STBA concentration showed a significant decrease in postdialysis using a polysulfone membrane in ACRF patients with and without pruritus. Finally, correlation with STBA and itch score of pruritus was significant (p < 0.02).

CONCLUSION

Hemodialysis patients with ACRF and pruritus showed an increase of STBA in predialysis and a decrease in postdialysis.

Fecal bile acid excretion profile in gallstone patients

Epidemiological studies have shown a positive association between cholesterol gallstones and colonic cancer. These two diseases may be somehow related with bile acids metabolic alterations. The aim of this study was to evaluate the profiles of fecal bile acid in gallstone patients, in order to estimate the quality and amount of fecal bile acids. A fecal bile acid profile of ten gallstone patients and ten controls was compared using high performance liquid chromatography. Total fecal bile acid excretion was significantly increased in gallstone patients compared with controls (692.7 mg/day (302.5-846.2) vs 165.7 mg/day (138.7-221.3), p < 0.01) as was the excretion of secondary free bile acids 562.9 mg/day (253.3-704.9) vs 99.9 mg/day (88.9-154.2), p < 0.01). Lithocholic and glycodeoxycholic acid percentages have also been found to show differences with controls of 55.4 (47.4-73.9) vs 24.6 (22.1-38.4) (p < 0.01) and 29.4 (3.3-41.7) vs 2.8 (1.0-3.8) (p < 0.03), respectively but deoxycholic acid has not shown differences between the two groups. Moreover, the percentage of ursodeoxycholic acid diminished significantly in gallstone patients (1.5 (1.0-2.8) vs 8.6 (6.0-10.39) (p < 0.001), and the decrease of chenodeoxycholic acid was also significant (20.0 (11.4-23.6) vs 8.9 (3.1-10.9) (p < 0.03) along with a rise in the ratios lithocholic/deoxycholic acids (1.8 (1.4-6.4) vs 0.9 (0.6-1.6) (p < 0.05) and glycine/taurine of deoxycholic acid (7.3 (4.1-46.6) vs 0.2 (0.1-0.5) (p < 0.01). In conclusion, we have observed a significant increase of total and secondary fecal bile acid excretion as well as a rise of LCA and GDCA percentages and a rise in the ratios of LCA/DCA and glycinet/taurine of DCA.

Hexose transport in growing petunia pollen tubes and characterization of a pollen-specific, putative monosaccharide transporter

We investigated the molecular and physiological processes of sugar uptake and metabolism during pollen tube growth and plant fertilization. In vitro germination assays showed that petunia (Petunia hybrida) pollen can germinate and grow not only in medium containing sucrose (Suc) as a carbon source, but also in medium containing the monosaccharides glucose (Glc) or fructose (Fru). Furthermore, high-performance liquid chromatography analysis demonstrated a rapid and complete conversion of Suc into equimolar amounts of Glc and Fru when pollen was cultured in a medium containing 2% Suc. This indicates the presence of wall-bound invertase activity and uptake of sugars in the form of monosaccharides by the growing pollen tube. A cDNA designated pmt1 (petunia monosaccharide transporter 1), which is highly homologous to plant monosaccharide transporters, was isolated from petunia. Pmt1 belongs to a small gene family and is expressed specifically in the male gametophyte, but not in any other vegetative or floral tissues. Pmt1 is activated after the first pollen mitosis, and high levels of mRNA accumulate in mature and germinating pollen. A model describing the transport of sugars to the style, the conversion of Suc into Glc and Fru, and the active uptake by a monosaccharide transporter into the pollen tube is presented.

Natural estrous cycle in normal and diabetic bitches in relation to glucose and insulin tests

The influence of spontaneous "sex seasons" on blood sugar (BS) and serum insulin levels was studied in bitches with natural diabetes mellitus (DM) and normal controls, in the basal condition and during glucose and insulin tests, was studied. DM increased basal BS, reduced glucose tolerance, distribution space (DS) and clearance from blood, and induced resistance to insulin hypoglycemic action. In normals occurrence of "seasons", inconsistently modified basal BS, increased glucose tolerance and DS; during estrogenic phase (EP), these variables were above those during luteal phase (LP). In diabetics at LP, BS found in lasting condition and during glucose test were higher than in diabetic bitches at EP (respective values at anestrous (A) in between) and glucose DS was smaller. Rate of glucose clearance from blood remained unaffected by "seasons" in both dog groups. Basal serum IRI was not modified by DM or "seasons". In normals, serum IRI response to glucose load was nonsignificant during A and increased during the "seasons"; either insulin DS or the rate of insulin clearance from blood stream remained unchanged under the circumstances, the increase being mediated by insulin secretion. During EP, the increase was particularly intense and mean insulinogenic index (MII) rose. During LP, MII returned to A value, whereby diabetic states might be manifest. Serum IRI profiles during insulin test were not modified by "seasons" in normal bitches; such response in diabetic bitches was intense during A, then decreased (EP) or was later abolished (LP). Either in normal or diabetic bitches, the sensitivity to exogenous insulin hypoglycemic action remained unchanged in spite of "seasons". In diabetic bitches at A, serum IRI after glucose challenge peaked higher than in respective normal controls (insulin clearance and insulin DS were similar): they exhibited relative insulin shortage and resistance to insulin hypoglycemic action partly compensated by promoted insulin secretion. Along with "season", abolished serum IRI response to glucose load in diabetics was observed. During EP, extrapancreatic factors regulating serum IRI concentration and MII did not change in respect to A, whereby abolishment appears mediated by depressed insulin secretion. During LP, insulin antagonism in conjunction with 1) absolute insulin deficiency and 2) intense decrease in MII appears as a powerful factor exposing diabetic bitches to a severe or fatal derangement in diabetic disease.

Natural estrous cycle in normal and diabetic bitches. Basal serum total lipids and cholesterol. Serum triglycerides profiles during glucose and insulin tests

All mean basal serum, total, cholesterol and lipids (L) levels in both fasted, normal bitches and in bitches with natural diabetes mellitus (DM) at anestrous (A) and during estrous cycle were measured. Mean serum, total triglycerides (TG) concentration in these animals at the same sex, stages, fasted and during intravenous glucose (IVGTT) and insulin (ITT) tolerance tests, were studied. In normal and in diabetic bitches serum cholesterol mean basal level differed significantly; the occurrence of estrous cycles (either phase) failed to affect these levels; DM and estrous cycle did not interact significantly. As for L, the influences of group and phase of estrous cycle on this variable significantly interacted. DM raised the mean basal level of this variable, in the normal group, "sex seasons" occurrence did not affect it whereas in the diabetic animals "in seasons" (either phase) it was above as compared with that found in respective controls at A. Estrogenic and luteal phases (EP, LP) did not differ in this concern. DM raised the mean serum TG levels in the bitches in the fasting condition and also during both tests; sex cycles action is variable. During IVGTT and ITT, the mean serum TG levels were influenced by sex stages and also by time elapsed either from glucose or insulin load. Thus, in the normal group, sex cycling did not vary significantly the TG profile during IVGTT. In the normal bitches "in season" (either phase), serum TG profile at the end of ITT increased more intensely than in the dogs at sex rest. During IVGTT, in the diabetic bitches, this profile was below base line from 15 min after glucose load till the test was over. DM intensely increased the serum TG response to insulin load in the bitches at A whereas such response was moderately decreasing at the end of ITT in the diabetic bitches at LP. All these results are discussed on the bases of the current knowledge on action of endocrine and metabolic products on these variables in normal animals, and the unability of these products to explain themselves the acute, severe, diabetic chryses observed during the LP of estral cycle in diabetic bitches or even in certain normal dogs at this moment of their "season", when diabetic outset uses to occur.

Relationship between hyperinsulinemia and ambulatory blood pressure monitoring of lean and overweight male hypertensives

OBJECTIVE

To elucidate the role of hypertension as part of a state of insulin resistance.

METHODS

Thirty-one uncomplicated hypertensive men not receiving antihypertensive treatment or who had been without treatment for a 4-week washout period and 10 lean normotensive controls were compared. Hypertensive men were divided according to their body mass index into three groups. All subjects came to the clinic for measurements of height, weight, hip and waist circumferences, and sitting blood pressure, and to begin 24 h ambulatory blood pressure monitoring. Plasma glucose and insulin levels were measured during a 2 h oral glucose (75 g)-tolerance test. For the hypertensive population as a whole, behaviors of studied variables among dippers (n = 18) and nondippers (n = 13) were determined.

RESULTS

During oral glucose-tolerance testing blood glucose levels after 60 min and 120 min were significantly higher (P < 0.05) in members of the high body mass index group than they were in members of the low body mass index group. Insulin levels of members of the high and middle body mass index groups were higher than those of members of the low body mass index group after 60 min (P < 0.05 for both comparisons) and 120 min (P < 0.05 for both comparisons). The mean serum insulin level in members of the low body mass index group was significantly higher than that in normotensives after 30 min, 60 min and 120 min (P < 0.05 for all three comparisons). The mean serum insulin: plasma glucose ratio for men in the low BMI group was significantly higher than that for normotensives after 60 min and 120 min (P < 0.05 for both comparisons). Correlations of blood pressure and insulin levels were not significant. Levels of high-density lipoprotein cholesterol and triglycerides were lower in members of the group with high body mass index than they were in members of the group with low body mass index. Total cholesterol: high-density lipoprotein cholesterol ratio was higher for members of the high body mass index group than it was for members of the middle body mass index group. Weight, body mass index, casual systolic blood pressure, 24 h average systolic blood pressure and diastolic blood pressure, 0700-2300 h systolic blood pressure, and 24 h average heart rate-systolic blood pressure product of dippers were significantly lower than those of nondippers.

CONCLUSIONS

These results suggest that hypertension and being overweight have additive effects increasing insulinemia and that being overweight is associated with a significantly lower nocturnal fall in blood pressure.

Incidence of rat-soluble placental factors on IgE and IgG2a synthesis

PROBLEM

The in vivo effect of soluble factors present in placental culture supernatants (PCSs) on the synthesis of rat immunoglobulin E (IgE) and IgG2a isotypes was investigated.

METHOD OF STUDY

Batches of Wistar SPF rats immunized with a 10-microgram dose of ovalbumin and Al(OH)3 were used: group I, consisted of virgin rats; group II, virgin females injected simultaneously with PCSs; and group III, pregnant females. As controls, nonimmunized batches were included. Serum samples were collected at days 0 (basal) and 10 after antigen challenge, determining levels of total and specific antiovalbumin of both IgE and IgG2a by enzyme-linked immunoadsorbent assay (ELISA).

RESULTS

In vivo and at least at the doses administered, PCSs exert an inhibitory effect on the synthesis of specific and total anti-ovalbumin IgE during the course of immune response to such challenge. However, PCSs did not modify serum values of total and specific IgG2a.

CONCLUSIONS

These results suggest that PCSs exert selective influence on the synthesis of diverse immunoglobulin isotypes during immune response, through the balance of cytokines synthesized by placental cells.

Cyclic AMP infusion and blood sugar, serum insulin and serum nonesterified fatty acid responses to glucose in recent experimental hyperthyroid dogs

Recent experimental hyperthyroid (REH) dogs exhibit poor "in vivo" insulin responses to glucose probably due to a failure somewhere in cAMP-adenylate cyclase system. The actions of exogenous cAMP on these responses and on the regulation of blood sugar (BS) and serum nonesterified fatty acids (NEFA) during glucose infusion tests (GIT) in REH and normal dogs were studied here. Hyperthyroidism was induced by 1-thyroxine administration (100 micrograms/kg body wt./die, 10 days). GIT consisted of i.v. glucose-priming followed by glucose i.v. continuous infusion (60 min). cAMP (0, 33 or 66 mg/kg body wt./min) was infused alone (30 min) and then overlapped to gluco-se infusion (60 min). Peripheral veins were used for infusions and blood sample withdrawal. BS, serum inmunoreactive insulin (IRI) and serum NEFA concentrations, basally and throughout the test, were measured. Basally, there was neither action nor interaction of hyperthyroidism and exogenous cAMP on these variables. During the GIT, the BS levels remained unaffected by hyperthyroidism; cAMP increased them, but failed to interact with hyperthyroidism. cAMP noninfused normal dogs responded to hyperglycemia with hyperinsulinemia, whereas REH dogs noninfused the nucleotide did not. cAMP administration at a high dose promoted their response in normal and REH dogs, particularly in the former; in the latter, the response was still lower than in cAMP noninfused normal controls. Although recent hyperthyroidism increased serum NEFA basal level, it exerted neither action nor interaction with the infused cAMP on serum NEFA during GIT. Results are discussed on the basis that the abolished insulin secretion "in vivo" characterizing the REH dogs, related to beta-adrenergic deficiency, can be for the most part restored by exogenous cAMP administration, despite which some glucose and triglyceride metabolism impairments are developed.

Spatial and temporal suppressive behavior of bitter-sweet mixtures

Bitter-sweet suppression in sucrose-caffeine mixtures was checked directly by measure of perceived intensity and total persistence time and indirectly by measure of the volume of water employed to remove each taste sensation.

[Seroepidemiology of human rotaviruses in a community of the Avellaneda district, Province of Buenos Aires]

The results obtained during a prospective study performed in 49 families of the Avellaneda District, Buenos Aires Province, in order to known the seroepidemiology of human rotaviruses under natural conditions were described. Families which included a pregnant woman, were voluntarily recruited. The newborn was studied together with its family until two years of age, in order to assess the moment of the primary rotavirus infection. Feces from every person with gastrointestinal symptoms were obtained for rotavirus diagnosis. Blood samples from every member of the family were obtained since their recruitment and each 6 months until the newborn reached two years of age. Rotavirus infections were established by determining the amount of circulating rotavirus IgG antibodies in paired serum samples using ELISA. In all, 502.2 six-month periods with paired serum samples were studied. Most of the infections detected during the first year of life were primary infections (0.64 cases per child-year; 91.3% in seronegative children; p less than 0.005). The peaks of rotavirus diarrhea incidence were observed at the same age (0.25 cases per child-year; p less than 0.01). It must be stated that 51.9% of the newborns presented circulating anti-rotavirus IgG antibodies transmitted by the mother; 72% were breastfed for a mean period of 9.7 months. The total incidence of rotavirus infections was 0.63 cases per person-year, without significant variations for each age group. Most of them were asymptomatic cases and 61.6% were reinfections. These results show the high endemicity of human rotavirus in our population where siblings and adults act as reservoirs of the infection. Finally we found a significant relation between the level of circulating anti-rotavirus antibodies and the resistance to infection and illness caused by rotavirus during the six-month periods studied with paired serum samples (p less than 0.005 for infection; p less than 0.03 for diarrhea). The incidence of rotavirus infection did not seem to be statistically different among all the age groups. As we found a high incidence of reinfections and we were able to determine the total decrease in the level of serum anti-rotavirus IgG antibodies in 5% of the infections one year after the seroconversion was detected, we postulate a short duration of high antibody levels and protection associated with circulating anti-rotavirus antibodies.

Effects of short-term thyroxine treatment on pancreatic cytology and responses of blood sugar, serum insulin and serum free fatty acids to epinephrine infusion

The influence of short-term treatment with l-thyroxine on pancreatic histology and on the responses of glycemia, insulinemia and serum free fatty acids to a continuous l-epinephrine infusion in the absence or presence of alpha- and beta-adrenergic blockade was studied in male dogs. l-Epinephrine dosage: 0.06 microgram/kg body weight/min for 55 min. Two experimental groups were studied, one treated for 10 days with sodium l-thyroxine, one daily dose of 100 micrograms/kg body weight, the other of untreated controls. Three alternative treatments were applied to dogs of both groups: 1) no treatment; 2) alpha-adrenergic blockade with phentolamine (2.0 mg/kg body weight, 35 min before starting the l-epinephrine infusion); 3) beta-adrenergic blockade with propranolol (0.3 mg/kg body weight, 20 min before starting the l-epinephrine infusion). Body weight, rectal temperature, heart and respiratory rates were used as guidelines to assess experimental hyperthyroidism. Insulin immunocytolocalization was also studied in the Langerhans islets of T4-treated and control dogs. Body weight decreased and rectal temperature did not vary as a result of thyroxine administration which had no significant effect on respiratory and heart rate. The mean number of breaths from 0 to 120 min from the start of l-epinephrine infusion decreased in both T4-treated and control dogs submitted to propranolol blockage compared to non-blocked animals; phentolamine had no effect on the respiratory rate. Thyroxine treatment did not modify the number of heart beats, but phentolamine blockade had a different effect in T4-treated compared to control dogs whereas propranolol had similar effects in these two groups. Histological examination of the Langerhans islets of dogs submitted to short-term thyroxine treatment showed degranulation though no vacuolation. Most of the beta-granules contained in the B-cells of these islets were found near the cell membrane, thus forming a dark brown line after the immunochemical reaction. Since negative images of B-cell nuclei and vascular spaces were predominant in these specimens, the pancreas of T4-treated dogs presented a mesh structure. In dogs submitted to short-term thyroxine treatment, the hyperglycemic response to l-epinephrine was enhanced and prolonged as compared to untreated controls. In normal dogs, this response is mainly mediated by alpha-adrenergic receptors while beta-receptors hardly influence this response.(ABSTRACT TRUNCATED AT 400 WORDS)

Blood sugar, serum insulin and serum free fatty acid responses to graded glucose pulses in hypothyroid dogs

The actions of hypothyroidism on BS, serum IRI and circulating FFA profiles observed in response to single glucose pulses at three levels of stimulation (1.00, 0.66 and 0.33 g/kg body weight) in male dogs were studied. Hypothyroidism modified neither of the mean basal values of these variables. There were different mean BS responses for every time and dose with significant interaction between the two. The BS curves at different doses were not parallel. There was a different time effect for every dose of glucose, and normal and hypothyroid dogs did not differ in this respect. The mean serum IRI responses found in normal and hypothyroid dogs were different; the mean responses at different times also differed, and there were significant normality-time and dose-time interactions. If the hypothyroid dogs and the euthyroid controls received a particular dose of glucose, a significant time effect on the serum IRI level was observed. In the normal dogs receiving glucose dose 1.00, a significant serum IRI response between 5 and 25 min was observed; in the hypothyroid dogs receiving a similar treatment, the significant response lasted from 5 to 45 min. In the normal dogs receiving glucose dose 0.66, the response was significant only at 5 min, and the serum IRI levels were below baseline between 60 and 90 min, while in the hypothyroid dogs the IRI response lasted from 5 to 25 min. In both normal and hypothyroid dogs receiving the 0.33 dose, the responses were significant between 5 and 25 min. As for the mean serum FFA responses to glucose, they were different at every time, and a significant normality-time interaction was found. In the euthyroid controls, the response lasted from 5 to 60 min, while it was longer in the hypothyroid dogs, lasting from 5 min after glucose injection until the end of the test.

Blood sugar, serum insulin and serum free fatty acid responses to slow graded glucose in thyroxine-treated dogs

The effects of short-term (10 days) thyroxine administration (100 micrograms/kg body weight/die) on the BS, serum IRI and circulating FFA responses to slow, graded glucose stimulation were studied in dogs. The experiments reported demonstrated that the mean basal BS value in thyroxine-treated dogs is higher than that found in untreated controls, and that non-parallel mean BS responses to glucose infusion were observed during the test: the higher curve was found in the thyroxine-treated group. Mean basal serum IRI was similar in both groups, and parallel insulinemic responses to hyperglycemia were observed. Mean serum IRI responses as a function of time from the start of infusion to hyperthyroid dogs were lower than those observed in untreated controls. Mean basal serum FFA levels in both groups did not differ, and parallel serum FFA curves were found during the test. Thyroxine treatment caused a better lipogenic response to combined hyperglycemia/hyperinsulinemia and a steep subsequent rebound of serum FFA, as compared to untreated controls. We conclude that dogs with recently induced hyperthyroidism show an impairment in the net glucose uptake by tissues, a poor insulinemic response to glucose, a good lipogenic response and a sharp subsequent rebound of serum FFA. The high BS curve, the high tissue FFA response to insulin antagonists and the high mean BS level in the fasting condition might be accounted for by a thyroxine-induced active production of cAMP in body cells, but the low insulin secretion evidently is due to other mechanisms.