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Biomedical subjects

V K Srivastava

Publications and source records attributed to V K Srivastava.

At least 19 recordsLinked to original sources
PubMed1992

Decreased fidelity of DNA polymerases and decreased DNA excision repair in aging mice: effects of caloric restriction.

Hepatic DNA polymerases from calorie restricted and ad libitum 26 month old C57BL/6 mice showed a decline in fidelity of nucleotide incorporation compared with weanling animals. Both alpha and beta polymerases from calorie restricted aged mice exhibited a higher level of fidelity than polymerases from ad libitum aged mice. UV-initiated unscheduled DNA synthesis was significantly higher in hepatocytes from weanling and 18 month old calorie restricted animals compared with cells from 18 month old ad libitum animals, while MMS-initiated unscheduled DNA synthesis did not differ significantly between cells from young and old or ad libitum and calorie restricted animals. These data suggest that calorie restriction could play a significant role in decreasing the age-related decline of cellular mechanisms expected to reduce the rate at which mutations accumulate during aging, and could potentially prolong the onset age of mutation-associated diseases of the elderly.

Aging↗
PubMed1992

Role of trace elements in senile cataract.

The contents of copper, zinc and protein were determined in cortex and nucleus sections of cortical and nuclear cataracts. The results show that copper and zinc content increased in both types of cataracts, although more in the cortex than nucleus sections of the cataractous lenses.

Cataract↗
PubMed1992

Coumarin congeners as antidepressants.

3-Carboethyl coumarin (I) was converted to coumarin 3-acid hydrazide (II). This on reaction with appropriate aldehyde yielded 3-arylidino amino coumarin (III). Compound III on diazotisation and reaction with ferric chloride yielded the corresponding formazans viz. 3-substituted phenyl azoarylidino, amido coumarins (IVa1-a10) and oxadiazoles viz. 2-aryl-5-(3-coumarinyl)-1,3,4-oxadiazoles (Va1-a3), respectively. Simultaneously 3-carboethyl coumarin on hydrolysis gave 3-carboxy coumarin (VI) which on reaction with aryl amine in methylene chloride yielded 3-(N-aryl)amido coumarin (VIIa1-a3). The compounds were screened for their antidepressant activity against a tricyclic antidepressant (imipramine). Compounds IVa4, IVa5 and IVa9 exhibited activity better than imipramine with no toxicity (ALD50 greater than 1000 mg/kg) but IVa5 showed some side effects.

Amphetamine↗
PubMed1992

Cerebral palsy.

The clinical pattern and etiology of 544 cases of cerebral palsy were studied retrospectively. Of these cases, 354 (65.1%) were males. Four hundred and ninety seven (91.4%) cases were of spastic type. Hypotonic, ataxic and athetoid cerebral palsy were observed in 5.5, 1.5 and 1.3% cases, respectively. There was one case each of tremor and mixed type. In the spastic group, quadriplegia comprised the maximum number of cases (34.9%). Hemiplegia (28.7%) and diplegia (21.9) were also common. Mental retardation was found in 47.2%, while speech impairment was observed in 37% cases. Other handicaps included visual (9%), seizures (8.8%), and auditory handicap (2.9%). The etiological factors were prenatal in 7.7% cases, natal in 43.8% cases and postnatal in 26.1% cases. More than one etiological factor was observed in 14.5% cases, while in 7.9% cases, no apparent cause could be found.

Cerebral Palsy↗
PubMed1992

Functional recovery following reptilean (Calotus calotus) spinal cord transection.

Various approaches to remedy the effects of spinal cord injury have been suggested from time to time. One of these is to study the regeneration following spinal cord transection in phylogenetic lower species in order to gain some information from this for its application in non-regenerating spinal cord injuries in higher species. In the present study the functional recovery following spinal cord transection in a reptile (Calotus calotus) was studied in 30 animals, and it was observed that functional recovery was quite marked by 4 weeks and more or less comple by 6 weeks.

Animals↗
PubMed1992

Synthesis and pharmacological evaluation of some phenothiazines as antidepressants.

10-Hydrazino acetyl phenothiazine (II) has been converted to N-10-acetyl amino phenothiazine-N-phenyl thiourea (III) which have been converted to 3-aryl-1-(10-phenothiazine acetyl amino)-2,3-dihydro-2-thioxo-4,6-(1H,5H) pyrimidinones (IV) on condensation with aryl amines and aryl aldehydes yielded 3-aryl-1-(10-Phenothiazine acetyl amino)-5-(substituted phenyl amino methyl)-2,3-dihydro-2-thioxo-4,6-(1H, 5H) pyrimidinediones (Va-k) and 3-aryl-1-(10-phenothiazine acetyl amino)-5-(substituted phenylidine)-2,3-dihydro-2-thioxo-4,6-(1H, 5H) pyrimidinediones (vl-o). The compounds were screened for their antidepressant activity against a tricyclic antidepressant (imipramine). Compounds Va, Vf, Vm and Vi exhibited activity better than imipramine with no toxicity (ALD50 greater than 1000 mg/kg) but Vi showed some side effects.

Amphetamine↗
PubMed1992

A survey of missed opportunity for immunization in Lucknow.

An exit interview of the women accompanying the children of 0-2 years visiting the three large urban hospitals and three randomly selected rural primary health centres of Lucknow district was undertaken to assess the magnitude of problem of missed opportunity for immunization at health facilities. The WHO suggested protocol for the study was followed. Observations reveal that in 59.1% children, the opportunity to vaccinate was missed. Only 3% children had a true contraindication for vaccination. Also 44.6% of women accompanying the children and in the reproductive age group could have been immunized against tetanus. A high level of acceptability of immunization in those with missed opportunity was noted.

Child Health Services↗
PubMed1991

Effect of dietary restriction on the fidelity of DNA polymerases in aging mice.

DNA polymerases purified from hepatic tissues of C57BL/6 mice showed an age-related decrease in both specific activity and fidelity of the various enzyme forms. Polymerases from dietary restricted mice exhibited less of a decline in specific activity and copied synthetic DNA templates with relatively higher fidelity than did enzymes from animals fed ad libitum. Polymerases treated with inositol-1,4-bisphosphate [I(1,4)P2] showed varying levels of increased activity, with fidelity increases up to 3-fold. These data indicate that aging is associated with decreases in both specific activity and fidelity of DNA polymerases isolated from a nondividing tissue, and that dietary restriction impedes the age-related decline in both specific activity and fidelity of these polymerases. The data further indicate that DNA polymerases may interact with phosphoinositide hydrolysis products resulting in increased specific activity and fidelity of the enzymes. Phosphoinositide interactions with polymerases could constitute an important mechanism moderating the age-related decrease in function and accuracy of DNA polymerases.

Aging↗
PubMed1991

Effects of aging and dietary restriction on DNA polymerase expression in mice.

DNA polymerase alpha was isolated from livers of 6-month-, 16-month-, or 26-month-old mice fed ad libitum, or calorically restricted. The enzymes differed in chromatographic characteristics, binding affinity for DNA, and activity, with both total activity and specific activity of DNA polymerase alpha decreasing as a function of age. A positive correlation was observed between polymerase alpha specific activity and the affinity of enzyme binding to activated DNA template-primer. The age-associated decline in enzyme activity was modified by dietary restriction, with measurably higher activity seen for polymerases from dietary restricted animals compared with ad libitum animals of all ages. The data suggest that dietary restriction could act to delay the age-associated decrease in cellular capacity for DNA synthesis, which may play a significant role in prolonging the onset of age-related diseases in which decreased DNA synthesis is a potential component.

Aging↗
PubMed1991

Beneficial effects of Allium sativum, Allium cepa and Commiphora mukul on experimental hyperlipidemia and atherosclerosis--a comparative evaluation.

Oral administration of petroleum ether extract of Allium sativum, Allium cepa and ethylacetate extract of Commiphora mukul in albino rats significantly prevented rise in serum cholesterol and serum triglyceride level, caused by atherogenic diet. All the three agents were also found to confer significant protection against atherogenic diet induced atherosclerosis.

Allium↗
PubMed1990

Placental transfer of metals of coal fly ash into various fetal organs of rat.

Fly ash (100 mg/kg body weight) was administered intratracheally to 14-day pregnant rats for 6 consecutive days. On day 20 of gestation the translocation of metals present in the fly ash to various maternal and fetal organs was studied. Fly ash administration to pregnant mothers retarded the growth of fetal heart and kidney as determined by their weights. Fly ash instillation increased organ levels of nearly all the metals studied in both mother and fetus. Most of the metals present in coal fly ash were transferred in significant amounts through placenta to several fetal organs. However, the pattern of their distribution into various fetal organs was different for different metals.

Animals↗
PubMed1990

An epidemic of dengue haemorrhagic fever and dengue shock syndrome in Delhi: a clinical study.

Twenty-four cases of dengue haemorrhagic fever/dengue shock syndrome were studied in Delhi in the months of September and October, 1988. The majority of these cases were boys aged 6-10 years. Classical symptoms of dengue (fever, headache, aesthesia, myalgia) occurred in all the patients. Digestive symptoms (nausea, vomiting, anorexia, abdominal pain and hepatomegaly) were also common. Haemorrhagic manifestations were present in 41.7% of the cases. Of these, 90% had gastrointestinal haemorrhages. Shock occurred in 17 cases (70.8%). Thrombocytopenia and prolongation of coagulation profile were found in 62.5% of cases. Three patients (12.5%) who presented with encephalopathy died. The other 21 patients recovered after an average period of 2-8 days.

Child↗
PubMed1990

Serodiagnosis of gut tuberculosis.

The efficacy of enzyme-linked immunosorbent assay (ELISA) in the diagnosis of gut tuberculosis was evaluated. The study included 95 patients with gut tuberculosis, 40 with pulmonary tuberculosis, 25 with non-tubercular intestinal diseases and 40 healthy controls. Mantoux response and antibody titre against PPD using ELISA were studied. The ELISA sensitivity in gut tuberculosis was 80% and in pulmonary tuberculosis 90%. It was also positive in 12% of patients with non-tubercular intestinal diseases and 5% of healthy controls. The sensitivity of Mantoux test in gut (77%) and pulmonary (84%) tuberculosis was comparable to that of ELISA. However, Mantoux test lacked diagnostic significance due to high positivity in non-tubercular disease patients (55%) and healthy controls (56%), whereas ELISA was highly specific (93%) for the diagnosis of gut tuberculosis.

Antibodies, Bacterial↗
PubMed1990

Modification of glybenclamide hypoglycaemia by verapamil in rabbits.

The study was designed to demonstrate the interaction between verapamil and glybenclamide on blood glucose in rabbits. Glybenclamide (0.05 mg/kg, po) induced hypoglycaemia was observed 1 h after treatment and persisted till 3 h. Verapamil (8 mg/kg, sc) per se produced hyperglycaemia which lasted for 2 1/2 hr. Concurrent administration of verapamil was found to impair significantly the hypoglycaemic response of glybenclamide.

Animals↗