Proton MR spectroscopy: higher right anterior cingulate N-acetylaspartate/choline ratio in Asperger syndrome compared with healthy controls.

BACKGROUND AND PURPOSE: One former study reported higher prefrontal N-acetylaspartate (NAA) levels in patients with Asperger syndrome (AS). The objective of the current study was to test the hypothesis that patients with AS would have higher dorsolateral prefrontal and anterior cingulate cortex NAA/creatine (Cr) and that NAA/Cr would be correlated with symptom severity. MATERIALS AND METHODS: NAA/choline (Cho), NAA/Cr, and Cho/Cr values revealed by (1)H-MR spectroscopy in 14 right-handed male patients with AS (6 medicated with risperidone), 17-38 years of age, diagnosed by the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, criteria were compared with those of 21 right-handed male controls frequency-matched by age and intelligence quotient scores. RESULTS: Patients with AS had significantly higher anterior cingulate NAA/Cho levels (z = -2.18, P = .028); there was a statistical trend for higher anterior cingulate NAA/Cr (z = -1.81, P = .069) that was significant when only the unmedicated patients with AS were taken into account (z = -1.95, P = .050). There were no significant differences in dorsolateral prefrontal MR spectroscopy values. CONCLUSIONS: Our findings show that individuals with AS had higher NAA/Cho levels in the right anterior cingulate compared with healthy controls and that higher anterior cingulate NAA/Cho levels were correlated with higher Yale-Brown Obsessive Compulsive Scale total scores.

Induction of oral mucosal tumors in hamsters and rats treated with methyl(acetoxymethyl)nitrosamine.

An oral tumor model has been developed in inbred Syrian golden hamsters by continuous applications every 2 weeks of methyl(acetoxymethyl)nitrosamine [(DMN-OAC) CAS: 56856-83-8; methylnitrosaminomethyl ester acetic acid] at 2 mg/kg body weight alone or by a single application of DMN-OAC followed by continuous twice weekly applications of 12-O-tetradecanoylphorbol 13-acetate (TPA) (1 microgram/animal). Similar studies were done in the W rat buccal mucosa. In the hamsters treated continuously with DMN-OAC, 100% of the tumors were observed in the cheek pouch; none were observed at other sites. In contrast, in the rats treated similarly, only a 67% tumor incidence was observed, of which only 42% were oral tumors. A promoter effect of TPA was observed in hamster cheek pouch tumors induced by DMN-OAC, whereas rat oral mucosa did not respond to TPA treatment.

Late target protein of the carcinogen N-2-fluorenylacetamide in rat liver.

In previous studies, administration of a radioactive tracer dose of the liver carcinogen, N-2-fluorenylacetamide (2-acetylaminofluorene; FAA), to normal or carcinogen-fed rats led to the presence of one or two principal labeled carcinogen: protein complexes in liver cytosol. The early target Mr 14,000 protein of the carcinogen in normal rats was identified as being liver fatty acid-binding protein and was associated in hepatocytes with normal mitosis and the cell proliferation brought about by either of the two liver carcinogens, FAA or 3'-methyl-4-dimethylaminoazobenzene. Continued ingestion of any of the three hepatocarcinogens, FAA, 3'-methyl-4-dimethylaminoazobenzene, or ethionine, resulted in the progressive loss of the early radioactive complex and the concurrent gain in liver cytosol of the late carcinogen: protein complex (Mr approximately 150,000) formed by the tracer dose of FAA. Present attempts to extract FAA derivatives from the late carcinogen: protein complex with organic solvents indicated that virtually all of the carcinogen was apparently covalently bound to the resultant denatured protein. It is unknown whether the covalent interaction occurred in vivo or as an accompaniment of the protein denaturation associated with the solvent extractions. In support of a possible noncovalent interaction, treatment of the unextracted complex with sodium dodecyl sulfate, urea, and beta-mercaptoethanol followed by electrophoresis readily dissociated the majority of the bound carcinogen. The late carcinogen: protein complex was shown to contain a 55 kDa subunit (p55), which was purified to homogeneity according to molecular size. The subunit is a relatively basic polypeptide with a pI of 8.4 to 8.6. In Western blots using rabbit immunoglobulins against the p55, the late target protein was found to be present at low concentrations in liver cytosols of normal rats, and was induced to relatively high levels by ingestion of the carcinogen for 3 to 5 weeks. The induction of high levels of the late target protein explains in part the progressive elevation in content of the late carcinogen: protein complex in rat liver during carcinogenesis by FAA. The isolated p55 was susceptible to a spontaneous stepwise breakdown, resulting in a ladder of decreasing molecular sizes with an average unit difference of 5.8 kDa per step over six size intervals. The p55 subunit was detected in nonhepatic organs of normal rats, but unlike levels in liver, the levels there were not affected by ingestion of the carcinogen.(ABSTRACT TRUNCATED AT 400 WORDS)

Normal hepatocytes exhibiting histone H3 with antibody accessible sites that are cryptic in carcinogen-altered hepatocytes.

A Mr 14,000 polypeptide (p14), identified as liver fatty acid binding protein, in normal liver cytosol was shown previously to be the principal target of the carcinogen, N-2-fluorenylacetamide (2-acetylaminofluorene), early during hepatic carcinogenesis in rats. Immunohistochemical analyses using rabbit antiserum against pure p14/liver fatty acid binding protein revealed marked increases in the levels of the protein in cytoplasm specifically during mitosis in normal and regenerating hepatocytes, and throughout the cell cycle in hyperplastic and malignant hepatocytes brought about by carcinogen, N-2-fluorenylacetamide (2-acetylaminofluorene) or 3'-methyl-4-dimethylaminoazobenzene. Present also in normal hepatocytes was a nuclear antigen that was not detected in the hyperplastic hepatocytes, benign hepatocytic adenomas, and hepatocellular carcinomas produced by these carcinogens. The nuclear antigen was discerned to be a Mr 17,000 polypeptide (p17) in extracts of normal liver nuclei and nucleosomes. In the present study, the p17 was purified by high-performance liquid chromatography and identified as being the three variants of histone H3, based on common molecular size, amino acid composition, electrophoretic migration in Triton-acetic acid-urea gels, and Western blot and histochemical reactions using affinity-purified antibodies. The histone H3 of all tested organs reacted specifically with the antiserum in Western blots following sodium dodecyl sulfate gel electrophoresis. In contrast, in a survey of 23 normal rat organs, nuclei of virtually only hepatocytes were reactive immunohistochemically. In view of the exceptional immunohistochemical reactivity of nuclei of normal hepatocytes, attributable to accessible histone H3, and the lack of such reaction in carcinogen-altered hepatocytes, the collected evidence indicates that normal hepatocytes contain uniquely available histone H3 sites that become cryptic during the chemical carcinogenesis.

REALIZATION OF INFORMED CONSENT AS ONE OF PATIENT'S RIGHTS: CURRENT SITUATION IN AZERBAIJAN.

Azerbaijan is a country in which the law is based on democratic principles. The mentioned principles underlie the national health care law. Democratic values, such as respect for human rights and freedoms, human dignity, as well as universal bioethical principles that are widely implemented in the national law, create conditions for the implementation of the patient's rights. The basic law governing the doctor-patient relationship, Law on Protection of Health of Population in Azerbaijan, reflects the basic patients' rights and obligations of doctors and medical institutions. Informed consent, which is a key component of patient rights, is also reflected, however, to date, a significant drawback of the Azerbaijan medical legislation is described in the article in this field. For example, at the moment there is no single standardized informed consent form in the country's different medical institutions. Due to the absence of any legally approved standards for informed consent forms, public and private health care institutions individually develop such forms, which sometimes can differ significantly. At the moment, one of the important directions in the field of healthcare is its improvement in accordance with international standards. The research made it possible to make conclusions about the necessary measures to improve and unify the informed consent form. The authors also analyzed the main provisions of the medical law of Azerbaijan and identified the main trends of its further development.

A review of dopamine agonist therapy in type 2 diabetes and effects on cardio-metabolic parameters.

Dopamine action appears to play a role in changes that are seen in obesity, metabolic syndrome and type 2 diabetes mellitus. Bromocriptine-QR (Quick Release), a dopamine agonist, is approved for use in treatment of type 2 diabetes. It has demonstrated modest improvement in glycemic parameters, cholesterol and weight in certain cohorts. Limited data using cabergoline, a long-acting dopamine agonist, also demonstrate glycemic efficacy. Additionally, bromocriptine-QR appears to have a favorable cardiovascular risk reduction. The direct mechanism by which bromocriptine-QR, or central dopamine agonism, achieves modest glycemic control and favorable cardio-metabolic profile is unclear. This relationship appears to be more complex than the historical explanation of "resetting" the circadian clock and may further be elucidated using data in individuals with hyperprolactinemia and prolactinoma.

Recognition of Autism Spectrum Disorder (ASD) symptoms and knowledge about some other aspects of ASD among final year medical students in Nigeria, Sub-Saharan Africa.

BACKGROUND: Earlier studies suggest that knowledge about Autism Spectrum Disorder (ASD) among healthcare workers in Nigeria is low. This present study assessed the knowledge of Nigerian final year medical students about symptoms of ASD and some other aspects of ASD. This is a cross sectional descriptive study that drew a total of seven hundred and fifty-seven (757) final year medical students from ten (10) randomly selected fully accredited medical schools out of a total of twenty-seven (27) fully accredited medical schools in Nigeria. Sociodemographic and Knowledge about Childhood Autism among Health Workers (KCAHW) questionnaires were used to assess knowledge of final year medical students about ASD and obtain demographic information. RESULTS: Only few, 218 (28.8 %) of the 757 final year medical students had seen and participated in evaluation and management of at least a child with ASD during their clinical postings in pediatrics and psychiatry. Knowledge and recognition of symptoms of ASD is observed to be better among this group of final year medical students as shown by higher mean scores in the four domains of KCAHW questionnaire. Knowledge about ASD varies across gender and regions. Misconceptions about ASD were also observed among the final year medical students. CONCLUSIONS: More focus needs to be given to ASD in the curriculum of Nigerian undergraduate medical students, especially during their psychiatry and pediatric clinical postings.

Selection of new biologically active molecules from random nucleotide sequences.

Genetic diversity can be achieved in vitro by inserting random nucleotide (nt) sequences into cloned genes. In the case of enzymes, subsequent genetic complementation can be used to select for new mutants that exhibit different substrate specificities, altered catalytic activities, or altered temperature sensitivities. Using this technique, one can also analyze the contribution of different amino acid residues to the structure and function of enzyme. Selecting biologically active DNA sequences from large random populations provides a new method for identifying nt sequences with unique functions. Analogous random sequence selection techniques have been applied to determine the consensus sequence of the Escherichia coli promoters, DNA and RNA sequences that bind specific protein(s), DNA regulatory sequences, ribozyme(s) and ligand-specific RNA(s). In this manuscript, we will consider recent data obtained in our laboratory as a result of inserting random sequences into the putative nucleoside-binding site of herpes simplex virus type 1 (HSV-1) thymidine kinase (TK). We have obtained over 2000 new mutant HSV-1 TKs, some of which are stable at higher temperatures or have altered substrate specificity and/or catalytic rates when compared to those of the wild-type enzyme.

Influence of estradiol on the benzo(a)pyrene hydroxylase activity induced by hexachlorocyclohexane.

Basal BP-hydroxylase activity was measured in male Swiss mice from the age of 3 weeks to 20 months. Maximal enzyme activity was at the age of 5 months. Comparison of the inducibility of BP-hydroxylase by HCH was also investigated in male and female mice of different ages. Male mice showed higher induction of BP-hydroxylase by HCH than females of the same ages. Sterilization of female mice enhanced enzyme induction. Estradiol exhibited competitive inhibition of BP-hydroxylase activity. After treatment with HCH for 8 months, female mice had a lower tumour incidence than males, and this paralleled a lower induction of BP-hydroxylase.

Developmental psychiatry: is there any other kind?

This paper describes the importance of the developmental perspective in psychiatry and addresses the lack of a developmental focus in the DSM-based descriptive empirical model. Although the publication of DSM-III in 1980 represented a "breakthrough" in psychiatry, the revisions of its diagnostic framework over the subsequent two decades have not adapted to the rapidly evolving changes in the field. In this paper we argue that, like once-grand theories, the breakthroughs in the diagnostic framework need to transform. The developmental perspective provides an interdisciplinary and conceptual framework linking facts and theories. It is inherent in different aspects of psychiatry and readily accommodates the descriptive-empirical model by means of inclusive concepts borrowed from developmental psychopathology and psychobiology. It also makes important contributions to a process-oriented approach to measurement. Developmentally operationalized and multidimensional constructs stand to broaden psychiatric domains beyond diagnosable disorders. This argues for preventive and early treatment interventions for a variety of mild, subthreshold, or delayed symptoms of various conditions, based on an understanding of the causal mechanisms and developmental processes involved.

A developmental and psychobiologic framework for understanding the role of culture in child and adolescent psychiatry.

In summary, despite these widely accepted interdisciplinary perspectives on the role of culture, the DSM framework lacks a culturally meaningful usage. For Kleinman, the changes on culture in the DSM-IV were "too little, too late." The cultural formulation and a glossary of culture-bound syndromes were included in its appendix. The acceptance by the DSM-IV task force of the notion of cultural variations in clinical presentation of disorders may be reflective of changes to come in the future. The current DSM-IV has more of a descriptive psycho-pathologic approach rather than an integrated cross-cultural, psychobiologic, developmental approach, however. The developmental perspective in psychiatry is emerging as a "bridge" for consilience through evidence-based scientific understanding and conciliation through clinical practice. This perspective is unique because it is intrinsic to different aspects of psychiatry. It readily accommodates the descriptive-empirical model by means of concepts borrowed from developmental psychopathology and psychobiology. These concepts include normalcy, life cycle, risk and resilience, and protective mechanisms within a dynamic construction of development that involves an interchange among biology-person-society-culture. The developmental perspective also can make important contributions to a process-oriented approach to measurement beyond a textually defined DSM structure. The developmentally operationalized dimensional constructs offer to expand psychiatry's domains beyond diagnosable conditions and illness boundaries. The developmental perspective argues for early preventive and therapeutic interventions for a broad array of applications based on demonstrated evidence of efficacy. Finally, the developmental perspective with its social and cultural contexts is an intrinsic complement to Kandel's framework for an expanded training of psychiatrists in the neurosciences and the associated innovative technologies for understanding the mechanism of structural and functional changes in the brain in various contexts and categories.

Hexachlorocyclohexane-induced tumorigenicity in mice under different experimental conditions.

Continuous administration of 500 ppm hexachlorocyclohexane (HCH) in the diet induced 100% liver tumors in mice, but none were observed in rats and hamsters treated with the same dose of HCH. In Swiss male mice, tumor incidence at earlier ages was greater than that observed in corresponding age groups of Swiss female mice. It was further observed that in Swiss females, sex hormones retarded the tumorigenic effect of HCH; in BALB/c mice a similar phenomenon was not observed.

Autism spectrum disorders (ASD) in Africa: a perspective.

BACKGROUND: The universal occurrence of autism spectrum disorders (ASD) was queried about twenty-six years ago. It was thought to occur only in western industrialized countries with high technological development. Over the last decade, knowledge about ASD and its prevalence has been documented as being on the rise in different regions of the world, with most literature coming from the western world -- the situation in Africa on aspects of ASD remain unclear. METHODS: Literature cited in Pubmed over the last decade on aspects of epidemiology, diagnosis, aetiology and knowledge of ASD in the African context were assessed. KEYWORDS: autism, diagnosis, aetiology, knowledge and Africa were variously combined in the literature search. RESULTS: No study specifically addressed the epidemiology of ASD in Africa. One of the two studies that were relevant addressed epidemiology of ASD in Arab countries, though included two Northern African countries. A higher proportion of non-verbal cases of ASD compared to verbal cases was documented in literature coming from Africa. Associated co-morbid disorders included intellectual disability, epilepsy and oculo-cutaneous albinism. Aetiological factors postulated included post-encephalitic infection, genetic and auto-immune factors, and vitamin D deficiency. Knowledge about ASD in Africa was noted to be low. CONCLUSION: There is a need for epidemiological studies in Africa to define the magnitude of the problem of ASD and the characteristics of children affected by ASD in this region. This would help in planning and might be helpful in answering the question of aetiology of ASD. Policy making needs to be directed at issues of childhood developmental disorders in Africa.

The treatment of psychotic symptoms in Fahr's disease with lithium carbonate.

A 20-year-old man with Fahr's disease who presented with bilateral basal ganglia calcifications, idiopathic dementia, choreoathetotic movements, and kyphoscoliosis developed psychotic symptoms that were refractory to treatment with haloperidol and responded to treatment with lithium carbonate.

Deviations in ornithine-related metabolism during hexachlorocyclohexane-induced hepatocarcinogenesis in mice: evidence for conversion of glutamate to ornithine.

Chronic administration of technical-grade hexachlorocyclohexane in Swiss male mice resulted in necrosis, and later in adenomatous nodules and hepatocellular carcinomas at 3, 7, and 10 months, respectively, after initiation of the experiment. A definite pattern of changes were observed of arginase, ornithine transaminase, ornithine carbamoyltransferase activities, and metabolites related to ornithine. Conversion of glutamate to ornithine correlated well with the decreased glutamate and constant ornithine in liver of mice fed hexachlorocyclohexane for 7 months.

Thymidine kinase mutants obtained by random sequence selection.

Knowledge of the catalytic properties and structural information regarding the amino acid residues that comprise the active site of an enzyme allows one, in principle, to use site-specific mutagenesis to construct genes that encode enzymes with altered functions. However, such information about most enzymes is not known and the effects of specific amino acid substitutions are not generally predictable. An alternative approach is to substitute random nucleotides for key codons in a gene and to use genetic selection to identify new and interesting enzyme variants. We describe here the construction, selection, and characterization of herpes simplex virus type 1 thymidine kinase mutants either with different catalytic properties or with enhanced thermostability. From a library containing 2 x 10(6) plasmid-encoded herpes thymidine kinase genes, each with a different nucleotide sequence at the putative nucleoside binding site, we obtained 1540 active mutants. Using this library and one previously constructed, we identified by secondary selection Escherichia coli harboring thymidine kinase mutant clones that were unable to grow in the presence of concentrations of 3'-azido-3'-deoxythymidine (AZT) that permits colony formation by E. coli harboring the wild-type plasmid. Two of the mutant enzymes exhibited a reduced Km for AZT, one of which displayed a higher catalytic efficiency for AZT over thymidine relative to that of the wild type. We also identified one mutant with enhanced thermostability. These mutants may have clinical potential as the promise of gene therapy is increasingly becoming a reality.

Effect of hexachlorocyclohexane on diethylnitrosamine-induced hepatocarcinogenesis in rat and its failure to promote skin tumors on dimethylbenz[a]anthracene initiation in mouse.

The promoting action of hexachlorocyclohexane (HCH) was evaluated in female Wistar rats by counting the gamma-glutamyltranspeptidase-positive foci which appeared in the liver after diethylnitrosamine (DENA) initiation. Liver tumor promotion by HCH was further confirmed in a long-term tumorigenicity study after DENA pretreatment. It seems likely that HCH is specific for liver tumor promotion since it failed to promote dimethylbenz[a]anthracene-initiated skin tumors in mice.