Biomedical subjects

A C Chu

Publications and source records attributed to A C Chu.

98 records · Page 6Linked to original sources

PubMed1980

Ultrastructural identification of T lymphocytes in tissue sections of mycosis fungoides.

An immunoelectronomicroscopic method has been employed to demonstrate in situ the T lymphocyte nature of the dermal and epidermal infiltrates to mycosis fungoides. A specific antiserum to the human T lymphocyte surface antigen (HTLA) was used in an indirect reaction with a peroxidase labeled anti-immunoglobulin. After histochemically revealing the peroxidase activity, T cells were easily identified by the deposition of electron dense material on the cytoplasmic membrane. Counterstaining with uranyl acetate and lead citrate enabled us morphologically to observe the maturity of infiltrating T lymphocytes and to identify Sézary cells and other cells such as eosinophils in the infiltrate. Our results confirm the T cell nature of the dermal infiltrate in mycosis fungoides and show that the epidermal infiltrate of cells forming Pautrier micro-abscesses are predominantly T lymphocytes.

Adolescent↗

PubMed1980

Evaluation of staining methods of resin embedded cutaneous tissue sections of mycosis fungoides.

Biopsies from lesional skin of patients with histologically confirmed mycosis fungoides were embedded in resin and semi-thin ( I micrometer) sections were submitted to a variety of staining procedures, including Toluidine blue, Richardson's Huber, Giemsa, Paragon and Tribasic stains. The stained sections were examined with the light microscope and the quality of cellular morphological detail afforded by the different stains was assessed. The Toluidine blue, Richardson's and Paragon stains were found to be technically easy to perform and gave the best representation of nuclear and cytoplasmic detail Of these, the authors favoured Richardson's stain. The technique of processing the tissue, and staining a mounting procedures are detailed.

Adolescent↗

PubMed1980

Pagetoid reticulosis: a disease of histiocytic origin.

A patient with Pagetoid reticulosis has been investigated using standard transmission electron microscopy and an immunohistochemical technique for identifying T lymphocytes in situ in light and electron microscopy. Our results indicate that the majority of the cells in the underlying dermal infiltrate are T lymphocytes but that only very few T lymphocytes are found in the extensive epidermal infiltrate. Ultrastructurally the majority of the abnormal cells in the epidermis are of histiocytic origin.

Histiocytes↗

PubMed1980

Cutaneous cryptococcosis.

A 31-year-old woman with long-standing renal disease, treated with systemic steroids and azathioprine, developed progressive skin ulceration and subcutaneous nodules. A diagnosis of cryptococcosis was established after histological examination of a cutaneous lesion and confirmed by culture of the organism from the biopsy specimen. A detailed description of the histology and ultrastructure of the cutaneous lesion is presented. Treatment with parenteral amphotericin B and 5-fluorocytosine resulted in dramatic resolution of the skin lesions.

Adult↗

PubMed1979

Identification in situ of T lymphocytes in the dermal and epidermal infiltrates of mycosis fungoides.

Frozen tissue sections from the lesions of five patients with histologically proven mycosis fungoides were examined using a specific antihuman T-cell antiserum and an indirect peroxidase staining technique. The dermal and epidermal infiltrates were shown to comprise predominantly cells bearing the specific T-cell antigen, HTLA. Two of the patients exhibited characteristic Pautrier microabscesses whose cells were exclusively T lymphocytes.

Adult↗

PubMed1976

Severe burns in children, 1964-1974.

580 children were admitted to the paediatric burns unit of Guy's Hospital between 1964 and 1974, of which 97 had burns exceeding 20% of the surface area, and 33 died (34% mortality). 80% of those with burns exceeding 50% of the surface area died. Young children died after less extensive burns. Respiratory failure, sepsis, and malnutrition were the most lethal complications. The prompt use and careful control of intravenous fluids had reduced the immediate complications associated with shock, and acute renal failure is now uncommon. Respiratory failure resulted in many deaths during the first week after injury. The need for intensive respiratory care involving paediatric, anaesthetic, and surgical staff is stressed. Sepsis and malnutrition remain major threats to survival. Improved methods of bacteriological control by laminar air flow units and topical antibacterial agents may help to reduce infection in the future. Reduction of energy expenditure by temporary skin coverings and a high environmental temperature, combined with a high calorie intake by oral and intravenous routes, may improve the outlook for severly burned children in the next decade.

Burns↗

PubMedDate not supplied

Langerhans cell histiocytosis of hypothalamus and optic chiasm: CT and MR studies.

The clinical, CT, and magnetic resonance features of two cases of hypothalamic/optic chiasm involvement with Langerhans cell histiocytosis are presented. In both cases, the mass was iso- to hyperdense on noncontrast CT with uniform postcontrast enhancement, whereas with magnetic resonance (one case) the mass remained isointense to brain on both long and short repetition time sequences. The pathophysiology of hypothalamic pituitary dysfunction is briefly reviewed.

Adolescent↗

PubMedDate not supplied

Fluticasone propionate in the treatment of inflammatory dermatoses.

Fluticasone propionate is a new, topically active glucocorticoid which shows high specificity for the glucocorticoid receptor. After topical application systemic absorption is low. The small amount that is absorbed is rapidly and completely inactivated by esterase-catalysed hydrolysis in the liver. Even when applied in large doses under occlusion, there is no evidence of hypothalamic/pituitary/adrenal (HPA) axis suppression. Studies on skin thinning have shown no significant effect on skin thickness after once-daily application of fluticasone propionate 0.05% cream for 8 weeks. This cream has been shown to be highly effective in the treatment of eczema, and once-daily application shows no significant difference in efficacy compared with twice-daily treatment. Limited studies using 0.005% ointment in moderate to severe psoriasis showed similar efficacy to 0.1% betamethasone-17-valerate ointment. Fluticasone propionate 0.05% thus represents a major advance in topical corticosteroids. It has a high safety profile and the cream formulation is effective in a single daily application.

Administration, Topical↗