German cockroach allergen proteins (Bla g)

German cockroach allergen proteins are a group of potent sensitizing antigens derived from the species Blattella germanica, which are major contributors to indoor allergy and asthma worldwide [1]. These proteins, including key allergens such as Bla g 1, Bla g 2, Bla g 4, and Bla g 5, originate from various sources like cockroach saliva, feces, and cast skins [2, 3]. Biologically, they encompass diverse functions ranging from enzymatic activity (e.g., the aspartic protease-like Bla g 2) to structural roles (e.g., the muscle protein tropomyosin Bla g 7) [2, 4]. In susceptible individuals, exposure triggers an IgE-mediated immune response, leading to chronic airway inflammation and bronchial hyperreactivity [4]. Therapeutic intervention primarily involves allergen-specific immunotherapy (AIT) using cockroach extracts to induce desensitization [5]. This process works by shifting the immune response from a Th2-dominated allergic profile to a more tolerant state characterized by regulatory T-cells and IgG4 production [5]. Additionally, biological therapies like Omalizumab are used to neutralize the IgE antibodies generated against these specific cockroach proteins [6]. Other biologics like Dupilumab target the underlying Type 2 inflammation associated with cockroach-induced asthma [6]. Management of these allergens is critical for reducing the global burden of urban asthma [1].

Other names

Blattella germanica allergensCockroach allergensBla g allergensCockroach allergen extractBla g 1Bla g 2Bla g 5

Allergen-specific immunotherapy (AIT) induces peripheral T-cell tolerance, increases regulatory T-cells (Tregs), and promotes the production of allergen-specific IgG4 antibodies that block IgE-mediated mast cell degranulation [5]. Monoclonal antibodies like Omalizumab neutralize allergen-specific IgE, while Dupilumab and Tezepelumab target Th2 and TSLP signaling pathways to reduce inflammation [6].