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Biomedical subjects

N H Antia

Publications and source records attributed to N H Antia.

At least 19 recordsLinked to original sources
PubMed1996

Primary resistance to single and multiple drugs in leprosy--a mouse footpad study.

Skin biopsy homogenates obtained from three cases of lepromatous leprosy with no prior history of antileprosy treatment were tested in the mouse footpad for the sensitivity of Mycobacterium leprae to multiple drugs. One of the inocula was sensitive to all the three drugs tested using the highest concentration each of DDS 0.01 g%, RFP 0.03 g% and CLF 0.01 g%. The 2nd inocula showed growth in the presence of 0.01 g% DDS only. While the 3rd inocula (Pt. KU) tested resistant to all the three drugs in the first, i.e. man to mouse, as well as in the second passage, i.e. mouse to mouse.

Adult↗
PubMed1995

Views on the sustenance of resistant Mycobacterium tuberculosis in the environment.

Microbial resistance to conventional as well as newly introduced drugs is a hallmark feature of several infectious diseases, notably tuberculosis. It is hypothesized that the greater the selective pressure exerted by increasingly potent drugs, the more rapidly is an organism able to adapt to a drug-containing environment. The roles of drug-containing environments, and the immunological status of the host and bacterial molecular mechanisms of development of drug resistance to Mycobacterium tuberculosis have been examined and examples cited for implementation of modified drug regimens in tuberculosis-control programmes. The views expressed, albeit restricted to Mycobacterium tuberculosis, encourage consideration of drug regimens on a disease evolution basis as well as understanding of the natural rules that govern development and sustenance of drug resistance in the microbial world.

Antitubercular Agents↗
PubMed1995

Vascular surgery of the posterior tibial compartment for plantar ulceration in leprosy.

Traditional surgical decompression of the posterior tibial nerve yields equivocal results. The authors postulate that the posterior tibial artery is the most compromised structure in the neurovascular compartment and that the best surgical results in healing of plantar ulcers are achieved by the rechannelling of the blood flow in the posterior tibial artery during posterior tibial neurovascular compartment surgery. This procedure has been of benefit to patients with plantar ulcers of greater than 7-10 years' duration in whom all other modes of healing had failed. It has been undertaken as an outpatient procedure under local anaesthesia, supported by postoperative vasodilator drugs. The use of tourniquet, antibiotics and surgical interference with the ulcer per se was eschewed. A report of 156 patients is presented with follow-up of up to 6 years for the earlier cases.

Follow-Up Studies↗
PubMed1994

Keyhole surgery.

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Developing Countries↗
PubMed1994

Immunohistological localization of mycobacterial antigens within the peripheral nerves of treated leprosy patients and their significance to nerve damage in leprosy.

The presence and distribution of Mycobacterium leprae-specific and cross-reacting antigens within the peripheral nerves of multidrug-treated patients with leprosy was investigated to gain a better understanding of the mechanism of nerve damage and the effect of multidrug therapy (MDT) on it. There was no specific qualitative difference in the type of antigens in the leprosy spectrum. However, our results indicate that there may be differential handling of antigens by the macrophages as compared to Schwann cells. This could play a key role in the pathogenesis of the disease. Multidrug treatment is effective in arresting the progression of the disease process as well as in reducing the viable bacterial load, both in borderline lepromatous and lepromatous (MB) and borderline tuberculoid and tuberculoid (PB) cases. However, the presence of M. leprae antigens in all the multidrug-treated MB nerve lesions and 87% of PB nerve lesions suggest that the antigens persist for a prolonged period. Hence, the risk of immunological reaction and antigen-associated silent nerve damage may continue even after majority of M. leprae were killed. The findings give further support to the view that most of the nerve damage is due to bacterial antigens.

Adolescent↗
PubMed1993

A morphological study of nerve biopsies from cases of multibacillary leprosy given multidrug therapy.

Nerve biopsies were examined from 17 cases of lepromatous leprosy given WHO-recommended multidrug therapy (MDT) for 2 years. The pathological changes were assessed qualitatively and quantitatively to judge the effectiveness of MTD. The nerves varied very considerably in the severity of their lesions. Some regenerating fibres were seen in most of the nerves. In a few cases, the nerves were almost entirely populated by regenerated fibres, confirming that MTD was effective in halting the disease process within the nerve. Mycobacterium leprae showed morphological features of degenerate bacilli. Some pathological features of the lepromatous lesion are described.

Adult↗
PubMed1992

Persistence of Mycobacterium leprae in the peripheral nerve as compared to the skin of multidrug-treated leprosy patients.

Skin and nerve biopsies obtained from 18 multibacillary (MB) and 16 paucibacillary (PB) cases of leprosy who had been fully treated by the WHO regimen were assessed for bacterial load using different staining techniques. In addition skin and nerve homogenates of 10 MB cases were tested for 'persistor' Mycobacterium leprae using immunosuppressed mice. While significant amounts of integral bacilli and BCG cross-reactive antigen of M. leprae were detected both in skin and nerve tissues of all the MB cases (100%), 56% of skin and 62% of nerve biopsies of PB cases also showed the presence of BCG cross-reactive antigen. Detection of 'persistor' M. leprae in 2/10 skin biopsies (20%) and 3/10 nerve biopsies (30%) of MB cases was thought to be unexpectedly high after 2 years of MDT.

Drug Therapy, Combination↗
PubMed1991

Radiolabeling of Mycobacterium leprae lipids within schwannoma cells, a potential drug screening system.

This study describes a novel method which could be developed into a test system of evaluating the efficacy of antileprosy drugs. The method estimates incorporation of [14C]acetate into lipids of Mycobacterium leprae maintained within the 33B Schwannoma cell line. Schwannoma cell-resident M. leprae cells incorporated significant levels of radiolabel within their lipids during 12 days of incubation in vitro. This incorporation was markedly reduced by 5 micrograms of rifampin per ml (decrease, 81.62%); this decrease was observed within 24 h of addition of the drug. Dapsone also reduced the radiolabel incorporation into the lipids, but to a lesser extent (decrease, 27.58%). This system was also able to differentiate between rifampin-sensitive and -resistant strains of mycobacteria. It is suggested that since the effect of bacteriostatic (dapsone) and bactericidal (rifampin) drugs could be detected by using this technique, it may prove useful in screening novel drugs acting against M. leprae.

Acetates↗