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Biomedical subjects

J Viac

Publications and source records attributed to J Viac.

At least 127 records · Page 7Linked to original sources
PubMed1982

OKT8 human phenotype expressed by Papio papio monkey lymphocytes.

The potential cross-reactivity between human and Papio papio monkey lymphocyte antigens was investigated using various monoclonal antibodies specific for human T cell subsets and HLA-DR antigens. Monkey circulating lymphocytes expressed the OKT8 antigen, specific for the suppressor/cytotoxic T cell population and the HTLA antigens. These reactivities were also detected on lymphoid cells in the thymus and lymph nodes of the Papio monkey.

Animals↗
PubMed1981

Keratin polypeptide modifications induced by human papilloma viruses (HPV).

The keratin polypeptide composition of different types of warts was studied by means of SDS polyacrylamide gel electrophoresis. It was composed of five main polypeptides, similar to those found in normal epidermis (mol. wt. 67K to 55K) and an additional polypeptide (72K) was often detected. The distribution of each polypeptide was expressed as percentage of total keratins in the different samples. The most characteristic feature observed in warts was the marked decrease of the 67K polypeptide. There were increased amounts of the 67K-63K proteins and some difference was observed in the distribution of these proteins in the different types of warts. Thus, the viral infection seems mainly to modify the proteins which are only involved in the latest stages of the differentiation of keratinocytes.

Cell Transformation, Viral↗
PubMed1981

Normal and psoriatic human skin grafts on "nude" mice: morphological and immunochemical studies.

124 normal and psoriatic human skin grafts were performed on congenitally athymic nude mice. 5, 10, 15, 20, and 30 days after grafting, histological and immunochemical studies (using bullous pemphigoid, pemphigus vulgaris and anti 67 K keratin polypeptide immune sera) were performed. The preservation of certain immunological identities of grafted skin, at least with regard to intercellular substance and basement membrane, was observed and the keratinization pattern of human epidermis also remained unaltered throughout the post-grafting period. The typical clubbing of rate ridges/acanthosis pattern in psoriatic skin was preserved in 40% of involved psoriatic skin grafts. The possible significance of these findings is discussed.

Animals↗
PubMed1981

Human papilloma virus type I purified from human genital warts.

Human wart virus (HPV) was isolated from a pool of genital warts. The electrophoretic mobility of virion proteins was studied by SDS polyacrylamide gel electrophoresis and showed the same pattern as that obtained with HPV-1. The analysis of DNA after restriction enzyme digestion with the endonucleases Hind III and Hae III, and nucleic acid hybridization did not show any difference with HPV-1. The viral particles were agglutinated by anti-HPV-1 serum, as shown by electron microscopic particle agglutination test. Furthermore, the immunological properties of this virus were investigated with guinea pig antiserum. Serologically, no antigenic cross-reaction between common and genital wart viruses were shown by immunodiffusion and immunofluorescence tests, whereas cross-reactions were detected between plantar and genital wart viruses. These results allow to think that HPV-1 can induce plantar warts as well as genital warts.

Animals↗
PubMed1980

Experimental production of antibodies against stratum corneum keratin polypeptides.

Anti-keratin polypeptide sera (K.P.S) were obtained by immunizing guinea pigs with fibrous proteins from stratum corneum, which were acquired from normal human epidermis by m eans of S.D.S. polyacrylamide gel electrophoresis. After absorption with red blood cells and liver powder the sera were tested by indirect immunofluorescence technique on different substrates. Antibodies against polypeptides P1 and P2 of M.W. 67,000 and 62,000 dalton, respectively, were directed toward cytoplasmic Ag of keratinocytes of spinous and graunular layer of normal human and rabbit epidermis. No labeling could be detected in the basal cell layer. This finding is in favor of various differentiation stages of the keratinizing cells. P3 of M.W. 53,000 dalton induced low titre anibodies which labelled the whole epidermis, including the basal cell layer. The fourth polypeptide of M.W. 49,000 dalton seemed not to be immunogenic in such experiences. In tumors, such as basal cell carcinom,a squamous cell carcinoma, and warts, the expression of keratin antigens is markedly diminished. No analogy could be drawn between experimental keratin polypeptide antibodies and the human epidermal cytoplasmic antibodies which were detected in some patient sera.

Animals↗
PubMed1980

Binding specificity of guinea pig anti-alpha-keratin polypeptide sera on human keratinocytes: comparison of their receptors with those of human epidermal cytoplasmic antibodies.

Experimental anti-keratin polypeptide sera (KPS) which were prepared by immunizing guinea pigs with the P1 polypeptide (molecular weight: 67 0000 dalton) of alpha-keratin of normal human stratum corneum, were shown to react in immunofluorescence only to cell cytoplasmic antigen of the upper layers of the epidermis. No staining was detected in the basal layer. An immunolabeling performed on free epidermal cells obtained after trypsinization demonstrated by electron microscopy that receptors for KPS were tonofilaments. Minor proportions of negative cells containing tonofilaments and numerous melanosomes detected might correspond to the basal cells. An IF pattern similar to that seen with KPS was observed with some human epidermal cytoplasmic sera (ECS). However, reciprocal blocking tests performed on both rabbit lip and normal human skin with the different sera showed no inhibition. No cross-reaction was detected by immunodiffusion test between whole purified alpha-keratin and human ECS. In electron microscopy, the receptors for ECS appeared not to be keratin-like, but were located on a granular part of the peripheral keratinocyte cytoplasm. These findings confirmed two steps (basal and malphighian layers) in epidermal differentiation defined by antigenic markers and especially by the alpha-keratin component of MW 67 000 d present in normal stratum corneum.

Animals↗
PubMed1980

[Study of normal and pathological keratinization using anti-keratin polypeptide sera (author's transl)].

Anti-keratin polypeptide sera were obtained against the different bands of polyacrylamide gel electrophoresis of fibrous proteins of stratum corneum derived from normal human epidermis. The sera were tested by indirect immunofluorescence of immunoperoxidase techniques. It was demonstrated that antibodies against P1 and P2 polypeptides, of MW 67,000 and 62,000 daltons respectively, were directed towards cytoplasmic antigens of keratinocytes of the upper Malpighian layers, while no labelling could be detected in the basal cell layer. Anti-P3 polypeptide sera and the anti-whole keratin serum labelled the whole epidermis, including the basal cell layer. Ultrastructural immuno-labelling performed on free epidermal cells obtained after trypsinization demonstrated that receptors for anti-P1 polypeptide sera were tonofilaments. These results showed that some keratin components (P1 and P2 polypeptides) might be absent in basal cell tonofilaments. This in in favour of various differentiation stages of the keratinizing cells. Keratin polypeptide 1 could be a useful marker of keratinization. According to preliminary studies, the expression of this keratin antigens was markedly disturbed in tumors such as basal and squamous cell carcinoma, in warts and in ichthyosis.

Antibodies↗
PubMed1979

Antigenic relationships between polypeptides derived from plantar and hand wart viruses.

Guinea pigs immunized with polypeptides derived from plantar and hand wart viruses developed both humoral and cell mediated immunity. The specificity of the antiserum was determined by indirect immunofluorescence (IF) tests and cellular immunity by intradermal tests. While whole plantar and hand wart virus particles (PV and HV) appeared to be immunologically analogous, they had different polypeptide patterns as shown by analysis on acrylamide slab gels. In particular, the P2 polypeptide (major virus protein) with different mol. wt. for PV (56750) and HV (54500) induced the production of high antibody titres in the animals and the immune sera specifically labelled wart substrates as shown in thie IF test, demonstrating that no cross humoral reaction occurs between these two polypeptides. Furthermore, a delayed hypersensitivity reaction was observed in P2 polypeptide-inoculated guinea pigs when whole particles were introduced in skin tests, but a total cross reactivity between PV and HV was noticed at the cellular level. However, the study of the virus isolated from the lesions of a patient (Ri) bearing extensive common hand warts has shown that the virus particles possessed all the biochemical and immunological characteristics of PV, in particular with regard to the P2 polypeptide. Such a case may represent plantar-like warts located on the hands.

Animals↗
PubMed1978

An immunoelectron microscopic localization of wart associated antigens present in human papilloma virus (HPV) infected cells.

Wart associated antigens were observed by the indirect immunoperoxidase technique in light and electron microscopy. Positive reaction products could be found in the nuclei of wart cells, in which virus particles were labeled with a specific immune rabbit serum and with human sera from patients with warts. Tissue antigens, differing from the viral labeled inclusions, were detected within the cytoplasm of some infected cells, by means of IgM and IgG antibodies from patients with warts. In these particular cells the positive reaction occurred in irregular patterns giving microgranular precipitates, which suggests that the antigen was not uniform. No staining was observed on the cell surface. This study has shown direct immunomorphological evidence in vivo of a specific immune reaction in man directed against whole virus and wart specific cellular antigens.

Animals↗
PubMed1978

Specific immunity to human papilloma virus (HPV) in patients with genital warts.

A study of human papilloma virus (HPV) specific cellular and humoral immunity in 30 patients with genital warts is reported. By in vivo testing with purified, inactivated plantar wart virus, a cell-mediated immunity to HPV was determined in 60% of patients. Circulating antibodies, evaluated by immunofluorescence testing, were rare, but these increased after an intradermal test had been carried out, especially in patients with a positive skin test, suggesting a booster effect. No significant difference was found between this group of patients and those having skin warts. Our results showed a specific immune response to HPV in most patients, confirming the role of the viral agent in the induction of genital warts.

Adolescent↗
PubMed1978

[Immunology of human warts (author's transl)].

Specific immune reactions in man subsequent to infection by wart virus have been the subject of various studies. Most concern humoral immunity and show an antibody distribution which rises with age comparable to the viral exanthems of childhood with a maximum at 20 years and show decline thereafter. The acquisition of antibody is prolonged and sometimes irregular and its role in wart healing is questionable. The most recent work on cellular immunity has demonstrated profound abnormalities in cases of profuse verrucosis and in epidermodysplasia verruciformis, increased incidence of warts in immunodeficient states and the existence of specific reactions to viral antigen both in vitro and in vivo. Such results indicate and predominant role for cellular immunity in the evolution of this viral infection and suggest the possibility of specific immunotherapy. Very recent studies of biochemical identification of purified virus particles of various clinical types of wart show viral heterogeneity. This fact implies the need to reexamine these immune reactions in the light of the existence of crossed serological reactivity and specific wart treatment.

Antigens, Viral↗
PubMed1977

Evidence for a T-cell reaction in the cutaneous sarcoid granuloma.

In cutaneous sarcoidosis, mononuclear cells of granuloma have been freed and characterized by immunological tests. Of these cells, 84% of them were found to be T dependent by the E rosette test. A similar value (79%) was obtained in the stroma of delayed hypersensitivity reaction, whose immunological functions are well known. However, the physiological role of the thymus dependent pupulation within granulomas must be established.

Female↗
PubMed1977

Specific immunity in patients suffering from recurring warts before and after repetitive intradermal tests with human papilloma virus.

The specific humoral and cellular immunity of 22 patients with multiple or recurring warts was studied. After repeated intradermal tests, using an inactivated, purified viral antigen, the responses obtained could be classed into two groups. The first group (10 patients) was characterized immunologically by the acquisition of a specific cellular immunity and the appearance of circulating IgG antibodies, and clinically by a total regression of resolution of the warts two to three weeks after the final intradermal test. The second group (12 patients) was characterized immunologically by a weak or non-existent specific immune response, and clinically by the unmodified persistence of the warts.

Adult↗
PubMed1977

Characterization of mononuclear cells in the inflammatory infiltrates of cutaneous tumours.

The identification of mononuclear cells extracted from cutaneous tumours (basal cell carcinoma, squamous cell carcinoma and superficial, spreading melanoma) has been investigated. The relative numbers of T cells and B cells have been determined using the E-rosette test and the EAC-rosette test. The results have been compared to those of delayed hypersensitivity type reactions. Different cell distribution patterns (E/EAC ratio) have been found in the infiltrates according to the type of tumour. An immunocytochemical technique has been developed for the identification in situ of immunoglobulin-producing cells in the inflammatory infiltrates. In each case the class of immunoglobulin (IgM, IgG or IgA) has been identified and the relative frequency of Ig-producing cells has been determined. The results indicate humoral and cellular immune responses with variations attributable to the type of tumour. In weakly malignant tumours, the infiltrate is characterized by an elevated number of T lymphocytes and numerous plasma cells which secrete all classes of Ig; in highly malignant tumours it is characterized by a reduced number of both T lymphocytes (E rosette) and plasma cells which do not secrete all classes of Ig.

B-Lymphocytes↗
PubMed1977

An in vivo study of cell-mediated immunity in human warts. Preliminary results.

Purified human papilloma virus (HPV) was used to study cell-mediated immunity (CMI) in patients with warts and in controls by means of the intradermal test (IDT). IDT was positive in 75% of patients with past history of warts, in 56% of patients presenting with warts, but in only 7% of controls. Immunofluorescent antibody levels were initially low and increased after injection of HPV antigen in all groups.

Antibodies, Viral↗