This work introduces the Artificial Neuro-Astrocyte Network (ANAN), a novel approach that incorporates artificial astrocytes into pre-trained Convolutional Neural Networks (CNN) to enhance performance without requiring additional training. By dynamically modulating synaptic weights based on neuronal activity, astrocytes allow the network to adapt to input data efficiently. The modulation created by astrocytes allows starting from a pre-trained CNN model where no further training or network adjustment is performed. This offers a resource-saving alternative to traditional fine-tuning methods. Experimental results demonstrate significant improvements in performance employing four different datasets, including one balanced and one imbalanced biomedical dataset, as well as two balanced ones encompassing natural images. Results in different application domains highlight the potential of astrocytes to optimize network performance.