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Biomedical subjects

E Pichard

Publications and source records attributed to E Pichard.

At least 73 records · Page 4Linked to original sources
PubMed1987

[Kaposi's disease in Western Africa. 11 cases in Mali].

Eleven cases of Kaposi's angiosarcoma (ASK) were observed in Bamako over a 2 year period, representing one third of all malignant cutaneous tumours. There was a clear cut male prevalence. The average age of the patients was 32 years. The commonest sites of involvement were cutaneous, osseous, lymphatic and gastrointestinal. Special features of this series included prurigo preceding skin lesions, a single gastric localisation and involvement of the cavum. Rapid progression was observed in 3 cases, 2 of which had fatal outcomes. Two patients had multifocal disseminated disease at the outset. These cases were similar to ASK in patients with AIDS but our patients were not immunodepressed and LAV serology was negative. The results of chemotherapy were incomplete and transient. This series demonstrates the presence of acute, polyvisceral forms of ASK in Mali which may be classified as intermediary between the classical European or African ASK and the ASK observed in AIDS with positive serology in Central Africa.

Adult↗
PubMed1987

[Sinus histiocytosis with extensive adenopathy in a Mali child].

Destombes, Rosai and Dorfman's sinus histiocytosis (HS) is a rare disease. Many cases have been reported in Africans, particularly in children. Case reported here is the second malian clinical report. Its particularities are difficulties for the histological diagnosis with confusion with Hodgkin's disease, a temporary decrease of adenopathies after vincristine therapy, an eosinophilic infiltrate of lymph nodes and a long evolution during at least 4 years. The pathological physiology of HS remains uncertain. The benign natural course of the disease does not justify employment of chemotherapy.

Diagnosis, Differential↗
PubMed1987

[African histoplasmosis in Mali].

Twenty-four cases of histoplasmosis have been diagnosed since 1945 in native Malians (20 cases) or Europeans living in Mali (4 cases). Seventeen cases have already been published and 7 other cases diagnosed recently in Bamako or Marseille are reported here. Mali is within the African histoplasmosis zone and the Kayes district may be a particularly endemic zone. The disease affected the skin (62 p. 100), lymph nodes (46 p. 100), bones (21 p. 100), gastrointestinal tract (26 p. 100) and lungs (4 p. 100). A rare lesion of the uvula is also reported. Direct fungal and histopathological techniques are the easiest and the most effective diagnostic investigations. All cases were due to Histoplasma duboisii. Amphotericin B was used in over 60 p. 100 of cases for an average period of 3 months. The total recovery rate was 66 p. 100.

Adolescent↗
PubMed1986

Viral alkaline nuclease in intranuclear dense bodies induced by herpes simplex infection.

The distribution of the herpes simplex virus alkaline nuclease (HSV DNase) in rabbit fibroblast cells infected with HSV type 1 or 2 (HSV-1 or HSV-2) has been examined with the aid of immunocytochemical techniques using gold particles as markers. HSV DNase was found to be accumulated within infected nuclei as early as 2.5 hr post-infection. Labeled antibody to HSV DNase subsequently increased in all nuclei after 7 hr and 17 hr. At all times post-infection the virus induced nuclear dense bodies were always the most intensely labeled structures. The association of HSV DNase with nucleoprotein containing structures was readily dissociated by hypotonic shock and detergent treatment, but its association with the dense bodies was not disrupted. Nucleolar 100 kDa protein was found to be simultaneously present in the dense bodies. This suggests that HSV DNase might interfere with ribosomal RNA synthesis and play a role in the degradation of the host-cell metabolism.

Animals↗
PubMed1986

Appearance of host-specific nucleolar proteins in intranuclear "dense bodies" following herpes simplex infection.

Nucleolar modifications induced by herpes simplex virus type 1 (HSV1) infection were studied at the ultrastructural level with special attention to the fate of a family of proteins serologically related to the nucleolar 100 kDa protein. Immunocytochemical techniques revealed that antigenic sites related to these proteins were associated with nucleoli in a pattern similar to that observed with non-infected cells. In addition, the "dense bodies" induced by HSV infection were heavily decorated by antibodies to the 100 kDa protein. Neither DNA nor RNA was detectable in the latter by cytochemical techniques. Therefore, it appears that "dense bodies" are exclusively proteinaceous and contain at least one host protein implicated in ribosomal RNA synthesis. An accumulation of 100 kDa protein in extra-nucleolar structures might account for previously reported defects in ribosomal RNA expression during HSV infection.

Animals↗
PubMed1986

[Major eosinophilia in bronchial cancer in an African man].

Paraneoplasic syndromes an unusual cause of eosinophilia in tropical countries. We report a case of major eosinophilia in a black Malian's bronchopulmonary cancer. A decrease of eosinophilia under antineoplastic chemotherapy is noted. Several physiopathologic hypothesis have been propounded in the literature, particularly the secretion by the tumour of a stimulating hormone for the production of eosinophil cells by the bone marrow.

Bronchial Neoplasms↗
PubMed1985

Influence of embedding media on DNA structure in herpes simplex virus type 1.

The organization of encapsidated herpes simplex viral DNA in situ was examined by use of the osmium-amine stain specific for DNA. After either formaldehyde or glutaraldehyde fixation the DNA is packaged in a compact toroid without inner structure with Epon or GMA embedment but revealed a complex inner structure with Lowicryl K4M embedment. In the latter there was an inner cylindrical core, 50 X 80 nm, around which were apposed one or more thick filaments of 5-8 nm diameter. Thinner DNA filaments of 3-4 nm diameter form a cage of loose coils around the core with an intervening space of approximately 15 nm. Lowicryl embedding may be considered as a tool to investigate the packaging of viral DNA in virions.

Acrylic Resins↗
PubMed1985

[Hemoglobin C in a hospital milieu in Bamako (Mali)].

An hospital survey, performed in Bamako (Mali, West Africa) showed 7.5% haemoglobin AC, 0.4% haemoglobin CC, 1.6% haemoglobin SC and 0.2% haemoglobin CA (haemoglobin C-beta+thalassaemia). Haemoglobin C was mostly prevalent among Bobo, Mossi, Senoufo, Minianka and Dogon coming from the Southern border of Mali. Haemoglobin SC and to a lesser extent haemoglobins CC and CA often induce haemolysis and vasoocclusion. Microcytosis is common, even in the absence of anaemia.

Adolescent↗
PubMed1985

[Toxicity of Glucantime. A case].

N-methylglucamine antimoniate (Glucantime) is used to treat visceral leishmaniasis but may give rise to serious and sometimes lethal complications: cardiac, hepatic, renal and haematological disease. These may be prevented by respecting the maximal suggested dosage of 6 cg/kg/day, regular clinical checks of pulse, blood pressure and temperature, biological follow-up of serum creatinin, transaminases and routine electrocardiography.

Adult↗
PubMed1984

Ultrastructural cytochemistry of intranuclear dense granules in nasopharyngeal angiofibroma.

Electron-dense round granules (ING) were found in the nuclei of fibroblastic cells of all the tumors examined by us (6 cases) and diagnosed clinically and histologically as nasopharyngeal angiofibroma (NPAF). The ING were consistently associated with this tumor and can be regarded as pathognomonic of NPAF. We studied at the ultrastructural level the composition of these particles using various cytochemical techniques. Enzymatic digestions carried out on thin sections as well as staining methods preferential or specific for nucleoproteins have revealed that ING represent tightly bound RNA-protein complexes and do not contain DNA. There are no data available that the ING takes part in the metabolism of NPAF fibroblastic cells.

Adolescent↗
PubMed1978

Localization of simian adenovirus 7 (SA 7) transcription and replication in lytic infection. An ultracytochemical and autoradiographical study.

We have studied SA7 (simian adenovirus 7) lytic infection at the ultrastruct level. The use of cytochemical techniques which specifically stain DNA or preferentially stain ribonucleoproteins permitted the analysis of the structure of the virus-induced nuclear inclusions, and revealed presumed virus DNA before the appearance of other nuclear alterations. Correlation of these findings with high resolution autoradiography enabled the functions of virus DNA replication and transcription to be ascribed to a defined nuclear inclusion. We demonstrate that the nucleolus remains distinct from the inclusion body, contrary to the situation in other adenovirus-infected cells. The functional role of host cell chromatin and of the nucleolus are discussed.

Adenoviridae↗