Effects of cellular fine structure on scattered light pattern.

Biological cells are complex in both morphological and biochemical structure. The effects of cellular fine structure on light scattered from cells are studied by employing a three-dimensional code named AETHER which solves the full set of Maxwell equations by using the finite-difference time-domain method. It is shown that changes in cellular fine structure can cause significant changes in the scattered light pattern over particular scattering angles. These changes potentially provide the possibility for distinguishability of cellular intrastructures. The effects that features of different intrastructure have on scattered light are discussed from the viewpoint of diagnosing cellular fine structure. Finally, we discuss scattered light patterns for lymphocyte-like cells and basophil-like cells.

Disappearance of primitive basaloid cells after external irradiation in adenoid cystic carcinoma of the lacrimal gland.

OBJECTIVE: To study the histopathological findings of basaloid adenoid cystic carcinoma after high dose orbital irradiation. MATERIAL AND METHOD: The histopathology study was done in a 38-year-old Thai female patient who had basaloid adenoid cystic carcinoma of the right lacrimal gland confirmed by incisional biopsy. After a 60-Gy external irradiation, the mass decreased in size and finally could not be palpated, but subsequent orbital imaging still showed infiltrative soft tissue mass at the right lacrimal gland with bony defects at posterosuperior and lateral walls without extraorbital extension. Orbital exenteration and lateral orbitectomy was performed. The specimen was submitted for histopathological examination. RESULTS: Microscopic examination revealed periglandular infiltration with chronic inflammation of the palpebral lobe of lacrimal gland. The orbital lobe was extensively replaced with fibrous tissue. There was only a small area of cribiform pattern of the adenoid cystic carcinoma left; no basaloid pattern was seen in the tissue. CONCLUSION: The primitive cells (basaloid pattern) disappear after orbital irradiation for adenoid cystic carcinoma of the lacrimal gland. Replacement with fibrous tissue is seen.

Basophil-derived amphiregulin is essential for UVB irradiation-induced immune suppression.

UVB irradiation (290-320 nm) is used to treat skin diseases like psoriasis and atopic dermatitis, and is known to suppress contact hypersensitivity (CHS) reactions in mouse models. Regulatory T cells (Treg cells) have been shown to be responsible for this UVB-induced suppression of CHS. The epidermal growth factor (EGF)-like growth factor amphiregulin (AREG) engages EGFR on Treg cells and, in different disease models, it was shown that mast cell-derived AREG is essential for optimal Treg cell function in vivo. Here we determined whether AREG has a role in UVB-induced, Treg cell-mediated suppression of CHS reactions in the skin. Our data show that AREG is essential for UVB-induced CHS suppression. In contrast to the general assumption, however, mast cells were dispensable for UVB-induced immune suppression, whereas basophil-derived AREG was essential. These data reveal, to our knowledge, a previously unreported function for basophils in the homeostasis of immune responses in the skin. Basophils thus fulfill a dual function: they contribute to the initiation of effective type 2 immune responses and, by enhancing the suppressive capacity of local Treg cell populations, also to local immune regulation in the skin.

Influence of UVB, UVA and UVA1 irradiation on histamine release from human basophils and mast cells in vitro in the presence and absence of antioxidants.

UV irradiation is widely used for the treatment of atopic eczema. In recent years, UVA1 phototherapy has gained increasing attention. This study analyzed the influence of different UV wavelengths--especially UVA1--on histamine release from human basophils and mast cells. The modulation of this parameter might be responsible for some of the therapeutic effects of UV irradiation. Enriched human basophils and human mast cells (HMC1 cell line) were irradiated with increasing doses of UVB, UVA and UVA1 in vitro. After irradiation, different stimulants were added to induce histamine release. In additional experiments, basophils were preincubated with superoxide dismutase, ascorbate or trolox to study the role of antioxidants in the modulation of histamine release after UV irradiation. UVA and UVA1 significantly inhibited histamine release from basophils and mast cells. UVB only had an inhibitory effect on mast cells. Preincubation with superoxide dismutase and ascorbate did not influence the inhibitory effect of UVA1 on basophil histamine release, whereas trolox decreased significantly the histamine release from nonirradiated basophils.

Physiological and clinical studies on norms and variations in counts of circulating basophile leucocytes.

Variations in the counts of circulating basophile leucocytes in 225 subjects were studied. The results obtained are as follows: 1) The counts (per mm3) show a gradual rise with growth, from infancy to adolescence, and maintain a fair constancy in adults. 2) No significant sex difference was found in the peripheral basophile counts. 3) A definite diurnal variation in the counts exists, which is lowest in the morning and highest in the evening. 4) the counts are altered in different phases of the menstrual cycle. 5) Pregnant women show lower counts than nonpregnant women. 6) Surgical trauma and a single electroconvulsive shock lowers the counts significantly but variations are not significant after meals and physical exercise. 7) Smokers have slightly higher counts than non-smokers. 8) course of irradiation therapy lowers the counts significantly in patients with inoperable noplastic diseases. 9) Counts show insignificant variation with alteration of blood glucose level. The results mentioned above are discussed.

[Effect of gamma radiation on the blood count in chickens]. / Vplyv gama ziarenia na krvný obraz kurciat

Postirradiation changes were investigated in 58 days old chicken that had been exposed, in an open experimental gamma field, to a continuous irradiation with Co60 with a flow of 60 R per day for a period of 30 days. Hematological examination was carried out after the total exposure to 600 R, 780 R, 1020 R, 1500 R, and 1800 R. More pronounced changes were recorded in the white blood count and in the number of thrombocytes, whereas no significant changes were found in the number of erythrocytes even after 30 days' irradiation. Leucopenia was found to occur in the case of 780 R and more. A significant lymphopenia occurred only in the case of 600 R and 780 R. Basophils responded more sensitively than did eosinophils. A highly significant thrombocytopenia was ascertained in the case of the total exposure from 780 to 1800 R. Hemorrhage, as a symptom of postirradiation diathesis, was not found.

Modulation of mammalian immunity by electromagnetic radiation.

There have been reports that electromagnetic radiation (EMR) alters the function of the immune system; however, these reports are often contradictory. This review reexamines the literature and attempts to evaluate the data on potential mechanisms of interaction of EMR on mammalian immune function. This report concludes that there is no convincing evidence that EMR effects on the human immune system are a health hazard. It was suggested by some authors that long-term EMR exposure may impair immune surveillance, and hypothetically thus facilitate tumor growth. Additional research is needed to prove or disprove this hypothesis. Available data indicate that EMR exposure does not affect the ability of cells of the immune system to respond to a subsequent challenge. However, the time-course and magnitude of the response may be affected by exposure following stimulation. Research to date provided evidence that at least at some frequencies and/or amplitude and pulse modulations, the site of primary interaction of EMR is at the cell membrane. However, it was shown that one specific response, the increase in B complement-receptor positive lymphocytes (Cr+) in the mouse is under genetic control by a single gene localized on chromosome 5. It is suggested that cells of the immune system are a convenient model for further studies on mechanisms of EMR interaction with living systems. Future research should be directed at exploring beneficial medical applications of EMR modulation of immune responses.

[Problems of hygienic standardization of electromagnetic fields produced by teletransmitting objects]. / Problemy gigienicheskoi reglamentatsii élektromagnitnykh polei, Sozdavaemykh teleperedaiushchimi o''bektami.

Maximum allowable electromagnetic field levels produced by teletransmitting stations and differentiated by frequency have been described. The prospects of further studies on the improvement of hygienic standardization of electromagnetic fields have been set forth.

In vitro effects of ultraviolet A on histamine release from human basophils.

BACKGROUND: As long-wave ultraviolet (UV) radiation penetrates the dermis, connective tissue cellular components and circulating blood cells can be possible targets for solar UVA. Basophils, involved in the effector phase of the inflammatory response, play a part in skin diseases such as chronic urticaria, psoriasis, atopic dermatitis, fixed drug eruption, allergic contact dermatitis, urticaria pigmentosa, systemic sclerosis and bullous pemphigoid. OBJECTIVE: The evaluation of the in vitro effect of UVA on histamine release from human basophils. METHODS: Basophils from healthy human volunteers were irradiated, respectively, with UVA at doses of 2.5, 5, 7.5, 10, 20 and 50 J/cm2 and then incubated with an anti-IgE serum. A fluorimetric technique was employed to determine histamine release from samples: (i) incubated with 2% HClO4 (complete lysis of basophils); (ii) irradiated with increasing doses of UVA; and (iii) unirradiated (controls). RESULTS: Histamine release was: 100% for HClO4 incubated basophils, 30% for unirradiated and anti-IgE incubated cells (controls) and 27%, 24%, 34%, 41%, 60% and 70% for basophils irradiated with UVA doses, respectively, of 2.5, 5, 7.5, 10, 20 and 50 J/cm2 and incubated with anti-IgE. Histamine releasability from irradiated samples was statistically significant (P < 0.05), in comparison with controls, at UVA doses equal to 5, 10, 20 and 50 J/cm2. CONCLUSIONS: UVA exerts, at least in vitro, a biphasic dose-dependent action on histamine release from human basophils incubated with an anti-IgE serum: at the lowest irradiation doses (< 5 J/cm2) it exerts an inhibitory effect and at the highest doses (> or = 10 J/cm2) histamine release increases significantly.

[Histophysiology of tissue basophils of the cerebral dura mater after laser irradiation]. / Gistofiziologiia tkanevykh bazofilov tverdoi mozgovoi obolochki pri lazernom obluchenii.

By means of the histochemical and morphometric methods the reaction of the tissue basophils of the brain dura mater has been studied to the one-time and varying-duration (0.5 sec.-3 hr.) irradiation by a helium-neon laser of the wave length 632.8 nm, power density 0.76 mvt/sm2. It has been found, that the laser irradiation had a biostimulating effect upon the tissue basophils; the first peak of activity is in the case of a 3-second continuous irradiation; the second--from 15 min. to 1 hr. In symmetrical parts of the right (irradiated) and left (nonirradiated) regions of the dura very similar changes of the functional activity of the tissue basophils activity were seen.

[Morphologic study of tissue basophils of the skin in rats after acute local irradiation]. / Morfologicheskoe issledovanie tkanevykh bazofilov kozhi krys posle ostrogo mestnogo oblucheniia.

A comparative morphological study was made of tissue basophils (TB) of rat skin at remote times (40, 70, 140, and 360 days) following single local exposure to soft and hard X-radiation with the doses at the skin surface of 15, 20, and 30 Gy. The TB response was maximum in the subepidermal and supramuscular layers of friable connective tissue. Changes in a median TB diameter were of a phase nature and a function of radiation dose absorbed in the skin layers under study.