What is the clinical evidence from this study?

Study design: Other. Population: Ovalbumin-induced asthma (n=20). Intervention: Alamandine vs. Ovalbumin-only control (OVA). Primary outcome: Airway resistance (Rn) post-methacholine challenge (p=<0.001).

What does this research mean for the field?

Therapeutic administration of alamandine significantly attenuates airway resistance and eosinophil infiltration via MrgD/Mas modulation in ovalbumin-induced asthma. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the prophylactic and therapeutic effects of subcutaneous alamandine administration on airway mechanics, eosinophilic inflammation, and receptor expression in an ovalbumin-induced rat model of asthma.

August 16, 2026BiomedicinesOpen Access

The Potential of Alamandine in Airway Hyperresponsiveness in an Ovalbumin-Induced Asthma Model

Q: What are the key findings of this study?

Therapeutic administration of alamandine significantly attenuated airway resistance and eosinophil infiltration to control levels (p<0.001 vs OVA) in an ovalbumin-induced asthma rat model.

Q: What does this research mean for the field?

Therapeutic administration of alamandine significantly attenuates airway resistance and eosinophil infiltration via MrgD/Mas modulation in ovalbumin-induced asthma. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

Q: What question did this study set out to answer?

To evaluate the prophylactic and therapeutic effects of subcutaneous alamandine administration on airway mechanics, eosinophilic inflammation, and receptor expression in an ovalbumin-induced rat model of asthma.

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Key result

Alamandine attenuates airway resistance and eosinophil infiltration back to control levels in asthmatic rats.

P<0.001
n=20

Why the study?

Alamandine, a renin-angiotensin system peptide with anti-inflammatory properties, remains poorly explored in allergic respiratory disease.

Does alamandine improve airway hyperresponsiveness and inflammation in an ovalbumin-induced asthma model?

Population

Twenty male Wistar rats

Comparison

Prophylactic ALA vs therapeutic ALA vs OVA-only control vs control

Design

Animal experimental study

Authors

VRVitória Nedel Rech ASAndresa Thomé SilveiraUniversidade Federal de Ciências da Saúde de Porto Alegre GGGiuliano Rizzotto GuimarãesUniversidade Federal de Ciências da Saúde de Porto Alegre

Discussion

Member takes

Implication

Alamandine may target the ALA-MrgD/Mas axis in asthma; hypothesis-generating in an animal model and should not yet change practice.

Key Points

To evaluate the prophylactic and therapeutic effects of subcutaneous alamandine administration on airway mechanics, eosinophilic inflammation, and receptor expression in an ovalbumin-induced rat model of asthma.
Twenty male Wistar rats (n = 5 per group) were allocated to four groups: control, ovalbumin-sensitized, ovalbumin with prophylactic alamandine (50 µg/kg/day, days 1–33), and ovalbumin with therapeutic alamandine (50 µg/kg/day, days 12–33).
Rats underwent sensitization on days 1–3 and aerosolized ovalbumin challenges on days 6–33.
Ventilatory mechanics were assessed on day 34 via methacholine challenge (12.5 mg/mL), followed by pulmonary eosinophil counts, MrgD and Mas receptor immunohistochemistry, and AT1 receptor Western blot quantification.
Therapeutic alamandine prevented methacholine-induced airway hyperresponsiveness, matching control airway resistance post-challenge (p = 0.999), whereas ovalbumin animals showed significantly higher resistance than control (p < 0.001) and therapeutic alamandine (p < 0.001).
Therapeutic alamandine reduced lung eosinophil counts compared to ovalbumin (p < 0.0001) and normalized them to control levels (p = 0.724), while prophylactic treatment achieved only partial reduction (p = 0.028 vs. control).
MrgD and Mas receptor lung expression were significantly higher in ovalbumin animals than all other groups (p < 0.0001), while AT1 receptor expression did not differ across groups (p = 0.6972).

Structured PICO

Does alamandine improve airway hyperresponsiveness and inflammation in an ovalbumin-induced asthma model?

Population

20 male Wistar rats subjected to an ovalbumin-induced asthma model to evaluate prophylactic and therapeutic alamandine administration over 33 days.

Intervention

Subcutaneous alamandine (50 µg/kg/day) administered either prophylactically (days 1–33) or therapeutically (days 12–33)

Comparator

OVA-only control (received daily subcutaneous injections of saline) and healthy control (saline only)

Outcome

Ventilatory mechanics (airway resistance, static compliance, and elastance) and pulmonary inflammation (eosinophil quantification) on day 34surrogate

Main Result

p-value: p=<0.001

Alamandine demonstrates bronchoprotective and anti-inflammatory effects in a rat model of asthma, highlighting the ALA-MrgD/Mas axis as a potential therapeutic target.

Limitations

Animal model may not fully replicate human asthma heterogeneity
AT1 receptor expression assessed in whole-lung homogenates may miss region-specific modulation

Cite This Study

Rech et al. (2026) studied Ovalbumin-induced asthma (n=20). Alamandine vs. Ovalbumin-only control (OVA) was evaluated on Airway resistance (Rn) post-methacholine challenge (p=<0.001). Therapeutic administration of alamandine significantly attenuated airway resistance and eosinophil infiltration to control levels (p<0.001 vs OVA) in an ovalbumin-induced asthma rat model.

synapsesocial.com/papers/6a817a01f2fb91fc834ad7c1 https://doi.org/10.3390/biomedicines14081832

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The Potential of Alamandine in Airway Hyperresponsiveness in an Ovalbumin-Induced Asthma Model

Discussion

Member takes

Implication

Key Points

Structured PICO

Main Result

Limitations

Cite This Study

The Potential of Alamandine in Airway Hyperresponsiveness in an Ovalbumin-Induced Asthma Model

Discussion

Member takes

Implication

Key Points

Structured PICO

Main Result

Limitations

Cite This Study

Also Consider

Also Consider