Plane Tree Pollen Research Articles

Anaphylactic reaction to young garlic

Garlic is well known to cause contact dermatitis and asthma. However, it is a very rare cause of food allergy. We present the case of a 23-year-old woman with previous history of allergy to pollen and dried fruit, and food-dependent, exercise-induced anaphylaxis for which no specific food could be identified as responsible, who experienced an anaphylactic reaction after eating young garlic. Skin prick tests and specific IgE immunoassay with several pollens and foods were performed, as well as the prick-prick test with young garlic and SDS-PAGE followed by immunoblotting IgE to young garlic and other Liliaceae species, mustard, sesame, parsley, celery, hazelnut, almond, and pollen of birch and mugwort. Skin prick tests and specific IgE were mainly positive for grass, plane tree, and mugwort pollen; peanut; hazelnut; walnut; almond; and mustard. Prick-prick tests with young garlic and garlic were positive. Total IgE was 113 U/ml. SDS-PAGE immunoblotting showed IgE-binding bands at 12 kDa to young garlic, garlic, onion, and leek extracts. Similar bands could also be detected with mugwort pollen and hazelnut extract. We describe IgE-mediated reaction to young garlic in a patient sensitized to pollen and dried fruit.

Seasonal asthma caused by airborne Platanus pollen

This work describes three patients suffering from bronchial asthma after being naturally exposed to airborne plane-tree pollen. The three patients gave immediate response in skin tests and dual response in bronchial provocations using Platanus hybrida extract. There was specific seric IgE activity against this/these antigen(s) with the CAP system. The three patients also showed significant correlation (P < 0.001) between their rhinitis and asthma symptom-scores registered on their diary cards and plane-tree pollen counts, collected using the Burkard spore trap. Among 187 patients living in Madrid and who came to our centre with a history of rhinitis and/or seasonal asthma, we found a prevalence of positive skin-prick tests to Platanus of 56%, only surpassed by gramineous pollen (Dactylis glomerata and/or Trisetum paniceum) 92% and Olea europaea 63%. The aerobiological sampling of the pollen content of the air in Madrid, carried out between 1 January 1979 and 31 December 1993 revealed an airborne presence (per cent of total yearly pollen count, mean of 1979-1993) of 14.9% for the Platanus, 14.8% for grasses, 9.8% for Olea and 3.6% for Plantago. The Platanus is one of the most frequently found pollens in the atmosphere over Madrid. At present, in this geographical area, a high percentage of patients with pollinosis are sensitive to this pollen. At least in some of these patients Platanus pollen is capable of inducing rhinitis and bronchial asthma.

Systemic reactions occurring during immunotherapy with standardized pollen extracts

Specific immunotherapy with standardized extracts administered by a rush protocol can induce systemic reactions (SRs). A prospective study was conducted in 454 pollen-allergic patients (aged 5 to 62 years) (1) to compare the incidence of SRs during a 3-day rush or step protocol, (2) to determine if patients presenting pollen asthma or those allergic to multiple pollen species would have an increased incidence of SRs, and (3) to attempt to decrease SRs. According to their sensitivity, patients received standardized extracts of orchard grass, andlor Parietaria, and/or olive, andlor plane-tree pollen with the same allergenically bioequivalent maintenance dose. Patients 10 years of age and older received 2000 BU; patients younger than 10 years, 1000 BU. The occurrence of SRs was carefully monitored. The incidence of SRs per patient ranged from 2.6% to 31.1%. With the rush protocol, there was a significant decrease in SRs after premedication ( p < 0.015). Severe SRs decreased further when the increase in doses was stopped because large local reactions occurred. Step protocol was only slightly better tolerated than rush protocol. Bronchial adverse reactions occurred more often in patients presenting asthma during previous pollen seasons. No reaction started 45 minutes or later after the last injection.

Studies on a new lymphocyte mitogen from pollen aqueous extract: induction of proliferation in human and rodent lymphocytes.

Fraction III (Fr III) mitogen was isolated from the whole aqueous extract (WAE) of plane-tree pollen by Con A-Sepharose chromatography and gel filtration. It stimulated mouse spleen cells, and peripheral blood lymphocytes from plane-tree non-sensitive patients or from cord blood. A 6-day culture gave the best response. The proliferation was not abolished by washing the cells after a short pulse of Fr III given in the initial step but was inhibited by alpha-D-methylmannoside. These results suggested that Fr III bound to a specific site onto spleen cells. This mitogen was not immunogenic in mice and did not bind to human IgE. It induced the proliferation of T lymphocytes in presence of accessory cells and was a polyclonal activator.

Isolation and characterization in vitro of an allergen from plane-tree (Platanus acerifolia) pollen.

A plane-tree pollen allergen was obtained by ion exchange and gel filtration chromatography. It is a glycoprotein with a molecular weight of 22,000. By isoelectrofocusing, two isomers with a high cross-allergenicity were obtained. The results suggest that this fraction is not the only allergen but certainly the most active.