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Updated: Oct 14, 2025

Angiogenesis in the Ischemic Rat Lung

Angiogenesis in the Ischemic Rat Lung

Published on: February 8, 2013

Pulmonary acini exhibit complex changes during postnatal rat lung development.

David Haberthür¹, Eveline Yao¹, Sébastien F Barré¹

¹Institute of Anatomy, University of Bern, Bern, Switzerland.

|November 8, 2021

Summary

This summary is machine-generated.

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Pulmonary acini, the lung's gas-exchange units, grow significantly and become more uniform in size during development. This homogenization optimizes lung function and ventilation in adult rats.

Area of Science:

Pulmonary research
Developmental biology
Medical imaging

Background:

Pulmonary acini are the functional units of the lung responsible for gas exchange.
Identifying individual acini in microscopic lung sections is challenging due to technical limitations.

Purpose of the Study:

To overcome limitations in visualizing individual pulmonary acini.
To characterize the developmental changes in acinar volume and alveolar number in rat lungs.

Main Methods:

High-resolution 3D imaging of rat lungs at multiple postnatal stages (P4, P10, P21, P60) using synchrotron X-ray microtomography.
Segmentation of individual pulmonary acini by airway closure at the conducting-to-gas-exchanging transition.
Stereological assessment of acinar volume and alveolar count for developmental analysis.

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Main Results:

Mean acinar volume increased 23-fold from postnatal day 4 to day 60.
The size distribution of pulmonary acini significantly homogenized, with the ratio of the largest to smallest acini decreasing from 27.26 to 4.07.
The coefficient of variation for acinar volume decreased from 1.26 to 0.49 during lung maturation.

Conclusions:

Pulmonary acini undergo substantial growth and size homogenization during postnatal development.
Homogenization of acinar size suggests optimization of the gas-exchange region and potentially more uniform lung ventilation in adult rats.
Early variations in acinar size may indicate non-uniform distribution within the developing lung.